Ch3 Botany Flashcards by BHUVI Chaudhary

What phase is between two successive M-phase?
(1) S-phase
(2) G1-phase
(3) G2-phase
(4) Interphase

(4) Interphase

How well did you know this?

Not at all

Perfectly

Interphase
(I) Is a biosynthetic phase in which the
cell duplicates its organelles
(II) Constituted more than 95% duration of cell
cycle
(III) Is the phase between two successive M-phases
(1) Only (I) is correct
(2) Only (II) and (III) are correct
(3) All are correct
(4) None

(3) All are correct

How well did you know this?

Not at all

Perfectly

Interphase involves all except–
(1) M-phase
(2) S-phase
(3) G1 phase
(4) G2 phase

(1) M-phase

How well did you know this?

Not at all

Perfectly

How much time does cell cycle of yeast takes?
(1) 2 hrs
(2) 60 min.
(3) 30 min.
(4) 90 min

(4) 90 min

How well did you know this?

Not at all

Perfectly

The correct sequence of phases of cell cycle is:
(1) G1→ G2→ S → M
(2) M → G1 → G2→ S
(3) G1→ S → G2→ M
(4) S → G1→ G2→ M

(3) G1→ S → G2→ M

How well did you know this?

Not at all

Perfectly

A cell cycle includes
(1) Interphase and M phase
(2) prophase, metaphase, anaphase and telophase
(3) G1, S and G2 phases
(4) karyokinesis and cytokinesis

(1) Interphase and M phase

How well did you know this?

Not at all

Perfectly

DNA replication occurs in which phase of cell cycle-
(1) M-phase
(2) S-phase
(3) G1 phase
(4) G2 phase

(2) S-phase

How well did you know this?

Not at all

Perfectly

Histone proteins are synthesised in
(1) S-phase
(2) G1-phase
(3) G2-phase
(4) M-phase

(1) S-phase

How well did you know this?

Not at all

Perfectly

The amount of DNA gets doubled in
(1) M-phase
(2) S-phase
(3) G1 phase
(4) G2 phase

(2) S-phase

How well did you know this?

Not at all

Perfectly

Select the incorrect statement regarding S phase of
interphase
(1) It occurs between G1 and G2
(2) DNA replicates in the nucleus in this phase
(3) Centrioles duplicate in the cytoplasm
(4) As DNA is doubled, number of chromosomes
also get doubled

(4) As DNA is doubled, number of chromosomes
also get doubled

How well did you know this?

Not at all

Perfectly

Which one is false about G1-phase (Gap-1)?
(1) It occurs between M and S phase
(2) In it cells are metabolically active and
continuously grow
(3) It is pre-synthetic or post mitotic phase
(4) In this phase DNA replicates

(4) In this phase DNA replicates

How well did you know this?

Not at all

Perfectly

In a cell with 8 chromosome, number of Centromere is –
(1) 16
(2) 8
(3) 4
(4) 32

(2) 8

How well did you know this?

Not at all

Perfectly

Starting of Prophase is marked by
(1) Complete disintegration of nuclear membrane
(2) Disappearance of ER, GB, nucleolus and
nuclear envelope
(3) Initiation of condensation of chromosomal
material
(4) Chromosomes aligns at the equatorial plate

(3) Initiation of condensation of chromosomal
material

How well did you know this?

Not at all

Perfectly

Mark the incorrectly matched –
(1) Untangling of DNA - Prophase
(2) Chromosome with two sister chromatid first
appear - Prophase
(3) Aster present – Animal cell
(4) Centriole present – plant cell

(4) Centriole present – plant cell

How well did you know this?

Not at all

Perfectly

End of prophase is marked by
(1) Complete disintegration of nuclear membrane
(2) Disappearance of ER, GB, nucleolus and
nuclear envelope
(3) Initiation of condensation of chromosomal
material
(4) Chromosomes align at the equatorial Plate

(2) Disappearance of ER, GB, nucleolus and
nuclear envelope

How well did you know this?

Not at all

Perfectly

The centrosome, which had undergone duplication
during S phase of interphase, now begins to move
towards opposite poles of the cell. This feature is of–
(1) Anaphase
(2) Metaphase
(3) Prophase
(4) Telophase

(3) Prophase

How well did you know this?

Not at all

Perfectly

Complete disappearance of nuclear membrane marks the beginning of
(1) Metaphase
(2) Anaphase
(3) Telophase
(4) Prophase

(1) Metaphase

How well did you know this?

Not at all

Perfectly

In which phase are chromosomes are clearly visible-
(1) Anaphase
(2) Metaphase
(3) Prophase
(4) Telophase

(2) Metaphase

How well did you know this?

Not at all

Perfectly

Initiation and complete condensation of chromosome occur respectively in
(1) Prophase and anaphase
(2) Prophase and metaphase
(3) Interphase and prophase
(4) Interphase and metaphase

(2) Prophase and metaphase

How well did you know this?

Not at all

Perfectly

In metaphase …….. is first event–
(1) Disintegration of nuclear envelope
(2) Chromosomal condensation start
(3) Chromosomes come at metaphasic plate
(4) Spindle fibre attach on chromosome

(1) Disintegration of nuclear envelope

How well did you know this?

Not at all

Perfectly

In ………… phase of mitosis chromosome is in
cytoplasm with two chromatids attach on centromere
(1) Anaphase
(2) Metaphase
(3) Prophase
(4) Telophase

(2) Metaphase

How well did you know this?

Not at all

Perfectly

In which phase Spindle fibre attach to Chromosome
(1) Anaphase
(2) Metaphase
(3) Prophase
(4) Telophase

(2) Metaphase

How well did you know this?

Not at all

Perfectly

In mitosis, which is the longest phase-
(1) Anaphase
(2) Metaphase
(3) Prophase
(4) Telophase

(3) Prophase

How well did you know this?

Not at all

Perfectly

If a cell has 2n number of chromosomes in G1 phase, what is the number of chromosomes in cell after S phase?
(1) n
(2) 2n
(3) 4n
(4) 6n

(2) 2n

How well did you know this?

Not at all

Perfectly

In which phase of cell cycle, tubulin protein synthesis occurs for spindle- (1) G1 (2) G2 (3) S (4) M

(2) G2

Consider the following statement – S-I-Amount of DNA in haploid cell is c S-II-Amount of DNA in Diploid cell in G1 is 2c S-II-Amount of DNA in Diploid cell in G2 is 4c Mark the correct option – (1) Only I correct (2) Both I and II correct (3) I, II and III is correct (4) All wrong

(3) I, II and III is correct

In which phase, ER and golgi body disappear? (1) Anaphase (2) Metaphase (3) Prophase (4) Telophase

(3) Prophase

Which of the following change does not occur in metaphase? (1) Condensation of chromosomes gets completed (2) Clearly visible chromosome in microscope (3) Sister chromatids separate (4) Kinetochores attach to spindle fibres

(3) Sister chromatids separate

The stage at which morphology of chromosomes is most easily studied is – (1) Anaphase (2) Metaphase (3) Prophase (4) Telophase

(2) Metaphase

In which phase two sister chromatid separate- (1) Anaphase (2) Metaphase (3) Prophase (4) Telophase

(1) Anaphase

Centromeres split and chromatids separate in ......... phase of mitosis – (1) Anaphase (2) Metaphase (3) Prophase (4) Telophase

(1) Anaphase

Mark the incorrectly matched - (1) Anaphase – Separation of sister chromatids (2) Metaphase – Centromeres split (3) Telophase – Nuclear membrane reappear (4) Metaphase – Chromosome condensation complete

(2) Metaphase – Centromeres split

In Anaphase, each chromosome moves away from the equatorial plate, the centromere of each chromosome remains directed towards the pole and hence at the leading edge, with the arms of the chromosome – (1) Move together with centromere (2) Arms trailing behind (3) Arms ahead of centromere (4) Arms remain at equator

(2) Arms trailing behind

Chromosomes cluster at opposite spindle poles and their identity is lost as discrete elements. This feature is visible in – (1) Anaphase (2) Metaphase (3) Prophase (4) Telophase

(4) Telophase

In which phase do chromosomes lose their identity and convert into chromatin- (1) Anaphase (2) Metaphase (3) Prophase (4) Telophase

(4) Telophase

Nuclear membrane and nucleolus which disappear at prophase, reappear back during which phase? (1) Anaphase (2) Telophase (3) Metaphase (4) During cytokinesis

(2) Telophase

In ........ phase of mitosis ER and golgi appear again– (1) Anaphase (2) Metaphase (3) Prophase (4) Telophase

(4) Telophase

Chromosomes move to spindle equator in….…….. phase of mitosis - (1) Telophase (2) Prophase (3) Metaphase (4) Anaphase

(3) Metaphase

At which stage of mitosis, the two daughter chromatids separate from each other, migrate towards the opposite poles and are now referred to as chromosomes of the future daughter nuclei? (1) Prophase (2) Metaphase (3) Anaphase (4) Telophase

(3) Anaphase

Mark the correctly matched – (1) S-phase – histone synthesis (2) Kinetochore – on telomere (3) Sister chromatid separate - Telophase (4) Nucleolus appear – Prophase

(1) S-phase – histone synthesis

Consider the following statements w.r.t cytokinesis S-I: In an animal cell, this is achieved by the appearance of a furrow in the cell wall S-II: In plant- cell plate formation occurs (1) Only S-I is correct (2) Only S-II is correct (3) Both S-I and S-II are correct (4) Both S-I and S-II are wrong

(2) Only S-II is correct

Which of the following is not a significance of Mitosis? (1) Repair (2) Growth (3) Maintenance of nucleocytoplasmic ratio (4) Maintenance of chromosome number generation after generation

(4) Maintenance of chromosome number generation after generation

Mitosis often results in the (1) Production of diploid daughter cells (2) Growth of multicellular organisms (3) Cell repair (4) All of the above

(4) All of the above

Following events represent which stage of mitosis? (i) Spindle fibres attach to kinetochores of chromosomes (ii) All the chromosomes coming to lie at the equator (1) Prophase (2) Metaphase (3) Anaphase (4) Telophase

(2) Metaphase

Consider the following statement – S-I: Kinetochore is disc shape proteinaceous structure S-II: Chromosome clustered at opposite poles convert into chromatin in anaphase Mark the correct option (1) Only S-I is correct (2) Only S-II is correct (3) Both S-I and S-II are correct (4) Both S-I and S-II are wrong

(1) Only S-I is correct

Mark the incorrect w.r.t meiosis (1) Reductional division (2) Maintain constant chromosome number generation after generation (3) Reduction of chromosome number by half (4) None of these

(4) None of these

Mark the incorrectly matched – (1) Plant cytokinesis – Cell plate method (2) Animal Cytokinesis – Furrow method (3) Plant cytokinesis-Centripetal order (4) Both (1) and (2)

(3) Plant cytokinesis-Centripetal order

If the number of chromosomes in G1 phase are 32, then the number of chromosomes in G2 phase are ___ (1) 16 (2) 32 (3) 64 (4) 8

(2) 32

Compaction of chromosome occur throughout in ……….. phase of meiosis– (1) Leptotene (2) Zygotene (3) Pachytene (4) Diplotene

(1) Leptotene

During _____ stage the chromosomes become gradually visible under the light microscope. (1) Zygotene (2) Pachytene (3) Leptotene (4) Diplotene

(3) Leptotene

Which of the following event takes place in zygotene? (1) Crossing over (2) Formation of bivalents (3) Synapsis (4) More than one

(4) More than one

Synaptonemal complex is formed during which phase of meiosis I? (1) Leptotene of prophase I (2) Zygotene of prophase I (3) Pachytene of prophase I (4) Diplotene of prophase I

(2) Zygotene of prophase I

In which of the following phase recombination nodule appears? (1) Zygotene (2) Leptotene (3) Pachytene (4) Diplotene

(3) Pachytene

The enzyme recombinase is required at which state of meiosis? (1) Pachytene (2) Zygotene (3) Diplotene (4) Diakinesis

(1) Pachytene

Crossing over takes place between which chromatids and in which stage of the cell cycle? (1) Non-sister chromatids of non-homologous chromosomes at Zygotene stage of prophase I. (2) Non-sister chromatids of homologous chromosomes at Pachytene stage of prophase I. (3) Non-sister chromatids of homologous chromosomes at Zygotene stage of prophase I. (4) Non-sister chromatids of non-homologous chromosomes at Pachytene stage of prophase I

(2) Non-sister chromatids of homologous chromosomes at Pachytene stage of prophase I.

Dissolution of synaptonemal complex start in (1) Diakinesis (2) Zygotene (3) Pachytene (4) Diplotene

(4) Diplotene

Diplotene stage of prophase-I is characterized by (1) Dissolution of synaptonemal complex (2) Separation of synapsed homologous chromosomes except at the site of crossovers (3) Formation of X-shaped structures called chiasmata (4) All of these

(4) All of these

Terminilisation of chiasmata occur in– (1) Diakinesis (2) Zygotene (3) Pachytene (4) Diplotene

(1) Diakinesis

Identify the meiotic stage in which (1) The chromosome becomes gradually visible with compaction of chromatin (2) The complex formed by a pair of synapsed homologous chromosomes (3) The four chromatin of each bivalent chromosome distinct and clearly appear as tetrad A B C (1) Leptotene Pachytene Diplotene (2) Leptotene Zygotene Pachytene (3) Zygotene Pachytene Diplotene (4) Zygotene Diplotene Pachytene

(2) Leptotene Zygotene Pachytene

A bivalent contains (1) Two homologous chromosomes (2) 4 chromatids (3) 2 centromeres (4) All of the above

(4) All of the above

Which of the following is true about cell cycle? (1) Coordinated event (2) Growth and reproduction occur (3) Under genetic control (4) All of the above

(4) All of the above

Which of the following is morphologically and genetically same? (1) Sister chromatid of homologous pair (2) Non-sister chromatid of homologous pair (3) Chromatid of different chromosome (4) All of the above

(1) Sister chromatid of homologous pair

Structure which are attach at common centromere- (1) Sister chromatid of homologous pair (2) Non-sister chromatid of homologous pair (3) Chromatid of different chromosome (4) All of the above

(1) Sister chromatid of homologous pair

Which of the following event occur in S-phase? (1) DNA damage repair (2) Tubulin synthesis (3) Centriole synthesis (4) DNA amount become half

(3) Centriole synthesis

Amount of DNA decrease to normal level in- (1) M-phase (2) S-phase (3) G1 phase (4) G2 phase

(1) M-phase

Decision to continue cell division is taken in which phase- (1) M-phase (2) S-phase (3) G1 phase (4) G2 phase

(3) G1 phase

In a Diploid cell (2n= 32) number of chromosome on metaphasic plate is– (1) 32 (2) 16 (3) 64 (4) 8

(1) 32

In which phase of cell cycle haploid cell undergoing mitosis have 2c DNA- (1) G1 (2) G2 (3) S (4) M

(2) G2

In which phase chromosome with two chromatids first appear- (1) Anaphase (2) Metaphase (3) Prophase (4) Telophase,

(3) Prophase

In which phase chromosomes are clearly visible change occur- (1) Anaphase (2) Metaphase (3) Prophase (4) Telophase

(2) Metaphase

In which phase spindle fibre attach to chromosome- (1) Anaphase (2) Metaphase (3) Prophase (4) Telophase

(2) Metaphase

This phase of cell cycle is a period of intense synthesis and growth. It constitutes 95% of the duration of cell cycle. It is (1) Interphase (2) Telophase (3) Prophase (4) Anaphase

(1) Interphase

In which phase of cell cycle chromatin starts to get condensed? (1) Prophase (2) Metaphase (3) Anaphase (4) Telophase

(1) Prophase

Identify the correct statement with regard to G1 phase (Gap1) of interphase. (1) Amount of DNA get double (2) Cell show growth (3) Nuclear division takes place. (4) Centriole duplication

(2) Cell show growth

Nucleus upon cytoplasm ratio increase in: (1) G1 phase (2) S phase (3) G2 phase (4) M phase

(4) M phase

Column I Column II 1 G1 phase i Cell grows and organelle duplication 2 S phase ii Centriole duplication 3 G2 phase iii Cell prepare for division 4 Metaphase in M-phase iv Kinetochore appear (1) 1-(iii), 2-(iv), 3-(i), 4-(ii) (2) 1-(iv), 2(i), 3-ii), 4-(iii) (3) 1-(i), 2(ii), 3-iii), 4-(iv) (4) 1-(i), 2-(ii), 3(iv), 4-(iii)

(3) 1-(i), 2(ii), 3-iii), 4-(iv)

In the last phase of mitosis (1) Chromosomes starts to condense (2) Spindle fibres attach to kinetochore (3) Nuclear membrane reassembles (4) Centromeres split to form two chromatids

(3) Nuclear membrane reassembles

The correct sequence of phases of M-phase (1) Metaphase→ G1 → G2 → Prophase (2) Prophase→ Metaphase→ Telophase → Anaphase (3) Prophase→ Metaphase → Telophase → Cytokinesis (4) Prophase→ Metaphase → Anaphase → Telophase

(4) Prophase→ Metaphase → Anaphase → Telophase

In M phase, the division of nucleus is called as (1) Cytokinesis (2) Karyokinesis (3) Nucleokinesis (4) Diakinesis

(2) Karyokinesis

In meiosis, compaction of chromatin is initiated at: (1) Pachytene (2) Leptotene (3) Zygotene (4) Diplotene

(2) Leptotene

A diploid plant cell with 20 chromosome that has just completed the S phase of its cell cycle than it has: (1) 20 chromosome and DNA amount 2c (2) 40 chromosome and 4c (3) 10 chromosome and 2c DNA (4) 20 chromosome and 4c DNA

(4) 20 chromosome and 4c DNA

In plant cells, cytokinesis occurs by (1) Cell plate (2) Invagination (3) Furrowing (4) All of the above

(1) Cell plate

The enzyme recombinase is required at which stage of meiosis? (1) Metaphase -I (2) Meiosis -II (3) Prophase-I (4) Metaphase -II

(3) Prophase-I

Which of the following phases of cell cycle is also known as the resting phase? (1) G1 phase (2) M-phase (3) S phase (4) Interphase

(4) Interphase

Mark the incorrect statement– (1) In leptotene chromosomes become gradually visible under the light microscope (2) Bivalent clearly visible in Zygotene (3) Prophase I is typically longer and more complex when compared to prophase of mitosis (4) Number of tetrads is equal to bivalents

(2) Bivalent clearly visible in Zygotene

In meiosis, synapsis occurs during (1) Pachytene (2) Zygotene (3) Leptotene (4) Diplotene

(2) Zygotene

During Meiosis I, in which stage synaptonemal complex appear? (1) Zygotene (2) Diplotene (3) Leptotene (4) Pachytene

(1) Zygotene

Which of the following occur in zygotene. (1) Synapsis occurs (2) Bivalent form (3) Pairing of homologous chromosomes occur (4) All of the above

(4) All of the above

Crossing over occur between– (1) Sister chromatids (2) Non-sister chromatids of non-homologous pair (3) Non-sister chromatids of homologous pair (4) Sister chromatids of homologous pair

(3) Non-sister chromatids of homologous pair

The four chromatids of each bivalent chromosomes become distinct and clearly appears as tetrads in– (1) Zygotene (2) Pachytene (3) Diplotene (4) Diakinesis

(2) Pachytene

In__________ phase of meiosis some time oocyte arrest in mammals– (1) Leptotene (2) Zygotene (3) Diakinesis (4) Diplotene

(4) Diplotene

Nucleolus disappear and spindle assembly occur in ………… phase of meiosis I (1) Leptotene (2) Zygotene (3) Diakinesis (4) Diplotene

(3) Diakinesis

Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres. (1) Anaphase-II (2) Metaphase-I (3) Prophase I (4) Anaphase -I

(4) Anaphase -I

The microtubules from the opposite poles of the spindle attach to the kinetochore of homologous chromosomes (1) Anaphase I (2) Anaphase II (3) Anaphase (4) Metaphase I

(4) Metaphase I

Arrange the following events of meiosis in correct sequence: (A) Activity of recombinase (B) Bivalent visible (C) Terminalisation of chiasmata (D) Disappearance of nucleolus (1) (B), (A), (C), (D) (2) (A), (B), (C), (D) (3) (B), (C), (D), (A) (4) (B), (A), (D), (C)

(1) (B), (A), (C), (D)

The stage between two meiosis is– (1) M-phase (2) Interphase (3) S-phase (4) Interkinesis

(4) Interkinesis

Which of the following not correct for interkinesis? (1) DNA Duplication occur (2) Stage between two meiotic division (3) Short lived (4) Both (1) and (3)

(1) DNA Duplication occur

The longest phase of meiosis I is– (1) Metaphase I (2) Prophase I (3) Anaphase I (4) Telophase I

(2) Prophase I

The stage during which chromosome completely condense (1) Pachytene (2) Diplotene (3) Diakinesis (4) Zygotene

(3) Diakinesis

Which of the following statement is incorrect? (1) Prophase II is simpler than prophase I. (2) Prophase I is longer and complex than prophase of mitosis. (3) Nuclear membrane reappears in telophase I. (4) Anaphase II is not characterized by the splitting of centromere.

(4) Anaphase II is not characterized by the splitting of centromere

Meiosis I is reductional division and meiosis II is equational division because of (1) Separation of chromatids (2) Crossing over (3) The disjunction of homologous chromosomes (4) The pairing of homologous chromosomes

(1) Separation of chromatids

The number of chromosomes is reduced to half during – (1) Anaphase of mitosis and meiosis (2) Meiosis II (3) Meiosis I (4) Anaphase

(3) Meiosis I

Chaismata appear in phase– (1) Diakinesis (2) Diplotene (3) Pachytene (4) Zygotene

(2) Diplotene

Amount of DNA and ploidy of all four cell after meiosis II is (1) 2c and n (2) c and n (3) c and 2n (4) 2c and 2n

(2) c and n

Column I Column II 1 Zygotene i Meiosis arrest in mammalian oocyte 2 Pachytene ii Nuclear membrane disappears 3 Diplotene iii Recombination nodule 4 Diakinesis iv Synaptonemal complex Select the correct option from the following: (1) 1-(iv), 2-(iii), 3-(ii), 4-(i) (2) 1-(i), 2-(ii), 3-(iv), 4-(iii) (3) 1-(iv), 2-(iii), 3-(i), 4-(ii) (4) 1-(iii), 2(iv), 3-(i), 4-(ii)

(3) 1-(iv), 2-(iii), 3-(i), 4-(ii)

The type of division that ensures the production of haploid phase in the life cycle of sexually reproducing organisms is (1) Mitosis (2) Meiosis (3) Cytokinesis (4) Interphase

(2) Meiosis

Longest phase of meiosis is (1) Prophase-I (2) Prophase-II (3) Anaphase-I (4) Metaphase-II

(1) Prophase-I

Nucleolus and golgi bodies may be disappear in which of the phase- (1) M-phase (2) S- phase (3) G1 phase (4) G2 phase

(1) M-phase

Assertion: In mitotic metaphase, morphology of chromosomes can most easily study. Reason: Condensation of chromosomes is completed in metaphase (1) Both Assertion & Reason are true and the reason is the correct explanation of the assertion. (2) Both Assertion & Reason are true but the reason is not the correct explanation of the assertion. (3) Assertion is true statement but Reason is false. (4) Both Assertion and Reason are false statements

(1) Both Assertion & Reason are true and the reason is the correct explanation of the assertion

During ………… phase the chromosomes are fully condensed and the meiotic spindle is assembled to prepare the homologous chromosomes for separation– (1) Metaphase I (2) Anaphase I (3) Diakinesis (4) Diplotene

(3) Diakinesis

In ………. Phase of meiosis I, chromosome pair is connected to opposite pole by spindle fibre - (1) Prophase I (2) Metaphase I (3) Metaphase (4) Both (1) and (2)

(2) Metaphase I

Recombination between homologous chromosomes is completed by the end of pachytene, leaving the chromosomes linked at the sites of ………… (1) Synapsis (2) Crossing over (3) Centromere (4) All

(2) Crossing over

The stage of mitosis by which condensation of chromosomes is completed, also shows all the following features, except (1) Chromosomes can be observed clearly under the microscope (2) Spindle fibres attach to kinetochores of chromosomes (3) Nucleolus, Golgi complex and ER reform (4) Chromosomes come to lie at the equator

(3) Nucleolus, Golgi complex and ER reform

In a maize plant number of chromosome are (2n=20) than number of bivalent and tetrad are in zygotene are respectively – (1) 20 and 20 (2) 20 and 10 (3) 10 and 10 (4) 10 an 20

(3) 10 and 10

The last stage of meiotic prophase I is marked by (1) Splitting of bivalents (2) Disappearance of recombination nodules (3) Dissolution of synaptonemal complex (4) Terminalisation of chiasmata

(4) Terminalisation of chiasmata

Stages in proper sequence of Prophase I are (1) Zygotene, Leptotene, Pachytene, Diakinesis and Diplotene (2) Leptotene, Zygotene, Pachytene, Diplotene and Diakinesis (3) Leptotene, Pachytene, Zygotene, Diakinesis and Diplotene (4) Diplotene, Diakinesis, Pachytene, Zygotene and Leptotene

(2) Leptotene, Zygotene, Pachytene, Diplotene and Diakinesis

Segregation of homologus chromosome occur in- (1) Anaphase I (2) Anaphase II (3) Anaphase (4) Both (1) and (3)

(1) Anaphase I

Choose the correct option for the following statements Statement I: In a plant cell, cytoplasmic division is achieved by the appearance of a furrow in the plasma membrane. Statement II: The cell furrow grows towards the centre of a cell during cytokinesis. (1) Statement I & II both are correct (2) Statement I is correct while statement II is incorrect (3) Statement I is incorrect while statement II is correct (4) Statement I & II both are incorrect

(3) Statement I is incorrect while statement II is correct

Consider the following and mark the incorrectly matched – (1) Time taken for yeast cell to divide – 90min (2) G2 phase -Gap between DNA replication & Cell Division (3) S-phase – Centriole duplication in plants cells (4) Anaphase -Shortest phase of mitosis

(3) S-phase – Centriole duplication in plants cells

Marks the incorrect Match (1) Karyokinesis is not followed by cytokinesis – Syncytium (2) Syncytium – Multinucleated condition (3) Animal cell – Formation of cell plate (4) Mitosis – Equational division

(3) Animal cell – Formation of cell plate

Which of the following change occurs in interkinesis? (1) DNA duplication (2) Chromosomes undergo complete dispersion (3) Very long phase (4) Centriole duplication

(4) Centriole duplication

The mitotic spindle is composed of - (1) Chromosomes (2) Chromatids (3) Microtubules (4) Chromatin

(3) Microtubules

Which of the following is known as quiescent phase? (1) G1 (2) S (3) G2 (4) G0

(4) G0

Splitting of centromere and hence separation of chromatids occur during (1) Anaphase of mitosis (2) Anaphase I of meiosis I (3) Anaphase II of meiosis II (4) Both (1) and (3)

(4) Both (1) and (3)

A bivalent of meiosis I consists of (1) Two chromatids and one centromere (2) Two chromatids and two centromeres (3) Four chromatids and two centromeres (4) Four chromatids and four centromeres

(3) Four chromatids and two centromeres

Choose the incorrect pair. (1) Kinetochores - Serve as the site of attachment of spindle fibres to the chromosomes (2) Meiosis I - Reductional division (3) Synthesis phase – Number of chromosomes doubles (4) Meiosis II – Resembles a normal Mitosis

(3) Synthesis phase – Number of chromosomes doubles

The amount of DNA in a somatic cell in G2 stage is 10 pg. The amount of DNA in its G1 stage would be (1) 5 pg (2) 10 pg (3) 20 pg (4) 15 pg

(1) 5 pg

Mark the correct for mitosis (1) Maintain same number of chromosomes indaughter cell (2) Produce identical copies (3) Can occur in both diploid and haploid cell (4) All of these

(4) All of these

Consider the following statements (a) One cycle of DNA replication (b) Two nuclear division (c) Formation of four haploid cell in the end (d) Genetically identical daughter cell How many are correct for meiosis? (1) (a), (b) and (c) (2) (b), (c) and (d) (3) Only (c) and (d) (4) All of these

(1) (a), (b) and (c)

Two basic stages of cell cycle are (1) Interphase and M-phase / divisional phase (2) Karyokinesis and cytokinesis (3) Prophase, metaphase, anaphase and telophase (4) G1, S and G2-phases

(1) Interphase and M-phase / divisional phase

Interphase. (1) Includes karyokinesis and cytokinesis (2) Sometime called resting phase, is the preparatory phase for division in which cell undergoes growth and DNA replication in an order (3) Is the shortest phase in which biomolecules are synthesised very fast (4) Includes 5% duration of the cell cycle

(2) Sometime called resting phase, is the preparatory phase for division in which cell undergoes growth and DNA replication in an order

Cells in G0-stage – (1) Are metabolically more active (2) Are metabolically inactive (3) Remain metabolically active but no longer proliferate in normal condition (4) None

(3) Remain metabolically active but no longer proliferate in normal condition

What happens in S-phase? (1) DNA replication (2) In animal cell replication of centriole (3) Both (1) and (2) (4) Separation of replicated DNA

(3) Both (1) and (2)

In which of the following phase number of chromosomes remain same but amount of DNA doubles? (1) G1 (2) Quiescent stage (3) G0 (4) S

(4) S

Find out the odd one w.r.t interphase (1) Karyokinesis (2) Cytokinesis (3) Prophase (4) All of the above

(4) All of the above

Which phase occupies the maximum part of cell cycle? (1) Mitotic phase (2) Meiotic phase (3) Interphase (4) S phase

(3) Interphase

Read the following statements about cell division and select the correct ones. (i) M phase represents the phase when actual cell division occurs and I phase represents the phase between two successive M phases. (ii) In the 24 hours average duration of cell cycle of a human cell, cell division proper lasts for only about an hour. (iii) M phase constitutes more than 95% of the duration of cell cycle (1) (i) and (ii) (2) (ii) and (iii) (3) (i) and (iii) (4) (i), (ii) and (iii)

(1) (i) and (ii)

Read the following statement w.r.t. cell cycle: (a) M-phase is also called the resting phase because replication does not occur during this phase. (b) Interphase is the phase during which the cell is preparing for division. (c) The interphase is divided into four prominent phases, i.e., G0, G1, S and G2 phases. (d) Interphase represents the phase between the two successive M phases. The option with incorrect statement is (1) (a) and (b) (2) (a) and (c) (3) (b) and (d) (4) (c) and (d)

(2) (a) and (c)

Column-I Column-II (A) G1-phase (i) Cell quiescence (B) M-phase (ii) Longest phase of the cell cycle (C) S-phase (iii) Less than 5% of total duration of cell cycle (D) G0-phase (iv) DNA content doubles (1) A (ii), B (iii), C (iv), D (i) (2) A (ii), B (iii), C (i), D (iv) (3) A (iii), B (ii), C (iv), D (i) (4) A (iii), B (i), C (iv), D (ii)

(1) A (ii), B (iii), C (iv), D (i)

Centrioles get doubled in (1) M-phase (2) S-phase (3) G1 phase (4) G2 phase

(2) S-phase

Disc shape structures at the surface of the centromeres are made up of (1) Lipid (2) Protein (3) Lipoprotein (4) Carbohydrate

(2) Protein

G2-phase is also called (1) Post-mitotic gap phase (2) Synthetic phase (3) Pre-mitotic gap phase (4) Only division

(3) Pre-mitotic gap phase

During which phase of cell cycle, the amount of DNA in a cell remains at 4C level if the initial amount is denoted as 2C? (1) G1 (2) G2 (3) S (4) M

(2) G2

If number of chromatids in G1 phase are 10, then the number of chromosomes are ________ in G1 (1) 10 (2) 20 (3) 5 (4) 30

(1) 10

Which of the following is the shortest phase of entire cell cycle? (1) Metaphase (2) Anaphase (3) Telophase (4) Interphase

(2) Anaphase

The best phase to study chromosomes is (1) Prophase (2) Metaphase (3) Anaphase (4) Telophase

(2) Metaphase

Chromosomes decondense into diffuse chromatin (1) At the end of telophase (2) At the beginning of prophase (3) At the end of interphase (4) At the end of metaphase

(1) At the end of telophase

Complete disappearance of nuclear membrane marks the beginning of (1) Metaphase (2) Anaphase (3) Telophase (4) Prophase

(1) Metaphase

How many rounds of mitotic generation are required to produce 64 cell from a single cell? (1) 63 (2) 32 (3) 6 (4) 64

(3) 6

The products of mitosis are (1) One nucleus containing twice as much DNA as the parent nucleus (2) Two genetically identical cells (3) Four nuclei containing half as much DNA as the parent nucleus (4) Two genetically identical nuclei

(2) Two genetically identical cells

In which phase of cell cycle, proteins required for DNA packing are synthesized? (1) G1 (2) G2 (3) S (4) M

(3) S

In which phase of karyokinesis, the sister chromatids separate? (1) Prophase (2) Metaphase (3) Anaphase (4) Telophase

(3) Anaphase

Which of the following statements is correct? (1) Animals show only mitotic division in haploid and diploid cells (2) After S phase the number of chromosomes becomes double i.e., 2n to 4n. (3) During the G2 phase, proteins are synthesised in preparation for mitosis while cell growth continues. (4) S or synthesis phase marks the period during which RNA synthesis takes place

(3) During the G2 phase, proteins are synthesised in preparation for mitosis while cell growth continues

Select the incorrect match regarding mitotic cell division (i) Prophase – Chromosomes begin uncoil (ii) Metaphase – Chromatids move apart (iii) Telophase – The nuclear membrane reappears (iv) Late anaphase – Each chromosome consists of two chromatids (v) Interphase – Chromosomes are not distinct (1) (i), (ii) and (iv) only (2) (i) and (iii) only (3) (ii), (iv) and (v) only (4) (i) and (v) only

(1) (i), (ii) and (iv) only

(i) In mitotic cell division, chromosome number is halved. (ii) Centromere is the point where two sister chromatids are held together. (iii) The period between two successive mitotic divisions is known as telophase. (iv) In G1 phase of cell cycle, proteins and RNA are synthesized. Which of the above given statements are correct? (1) (i) and (iii) only (2) (ii) and (iii) only (3) (i) and (iv) only (4) (ii) and (iv) only

(4) (ii) and (iv) only

Which of the following process is responsible for producing genetic recombination? (1) Synapsis (2) Chiasmata (3) Crossing over (4) Exchange of segments between sister chromatids of homologous chromosome

(3) Crossing over

If a gamete has 10 chromosomes, then how many bivalents will be produced in its corresponding meiocyte during meiosis? (1) 10 (2) 20 (3) 30 (4) 40

(1) 10

X shape structures between homologous chromosomes appear in (1) Leptotene (2) Zygotene (3) Diplotene (4) Diakinesis

(3) Diplotene

A bivalent contains (1) Two homologous chromosomes (2) 4 chromatids (3) 2 centromeres (4) All of the above

(4) All of the above

What is the number of chromosomes in the end products of meiosis if meiocyte is 4n? (1) n (2) 2n (3) 3n (4) 4n

(2) 2n

If amount of DNA in endosperm cell of an angiosperm is 30 picogram, then what would be the amount of DNA in G2 phase of a mitocyte of meristem in picogram? (1) 15 (2) 30 (3) 40 (4) 60

(3) 40

Prophase I is relatively ....... as compared to prophase of mitosis (1) Simple (2) Shorter (3) Longer (4) Longer and complex

(4) Longer and complex

In which of the following phase chromosomes separate without any splitting of their centromeres? (1) Anaphase (2) Anaphase I (3) Anaphase II (4) metaphase

(2) Anaphase I

Meiosis consists of (1) Two cell divisions with only one round of DNA replication (2) Two cell division in which number of chromosome will remain same in each daughter cell. (3) Two cell divisions with only two rounds of chromosome replication (4) A single cell division with chromosome replication

(2) Two cell division in which number of chromosome will remain same in each daughter cell

Column I Column II A Synaptonemal complex (i) Pachytene B Recombination nodule (ii) Zygotene C Terminalizationof chiasmata (iii) Telophase I D Formation of dyad cell (iv) Diakinesis (1) A-(ii); B-(i); C-(iv); D-(iii) (2) A-(i); B-(ii); C-(iv); D-(iii) (3) A-(iii); B-(i); C-(iv); D-(ii) (4) A-(ii); B-(i); C-(iii); D-(iv)

(1) A-(ii); B-(i); C-(iv); D-(iii)

Column I Column II A Chromosomes move to equator (i) Pachytene B Centromere splits and (ii) Zygotene chromatids move apart C Pairing homologous chromosomes (iii) Anaphase D Crossing over homologous between (iv) Metaphase chromosomes (1) A-(i), B-(ii), C-(iii), D-(iv) (2) A-(ii), B-(iii), C-(iv), D-(i) (3) A-(iv), B-(iii), C-(ii), D-(i) (4) A-(iii), B-(i), C-(iv), D-(ii)

(3) A-(iv), B-(iii), C-(ii), D-(i)

Four different steps that occur during meiosis are given in the following list: (i) Complete separation of chromatids (ii) Pairing of homologous chromosomes (iii) Lining up of paired chromosomes on equator (iv) Crossing over between chromatids Select the correct sequential arrangement of the steps. (1) (ii), (iii), (iv), (i) (2) (iii), (ii), (iv), (i) (3) (ii), (iv), (iii), (i) (4) (iii), (i), (ii), (iv)

(3) (ii), (iv), (iii), (i)

Identify the wrong statement about meiosis. (1) Pairing of homologous chromosomes. (2) Four haploid cells are formed. (3) At the end of meiosis number of chromosomes reduced to half. (4) Two cycles of DNA replication occur

(4) Two cycles of DNA replication occur

Anaphase of the mitosis is different from anaphase I, as it shows (1) Alignment of chromosomes at the equator (2) Separation of homologous chromosomes towards the opposite poles (3) Splitting of centromere and separation of sister chromatid towards the opposite poles (4) Attachment of spindle fiber from opposite poles to the Kinetochores of sister chromatids

(3) Splitting of centromere and separation of sister chromatid towards the opposite poles

Consider the following statement – S-I Chromosome is fully condensed in Metaphase S-II Chromosome is visible in Prophase Mark the correct option (1) Only S-I is correct (2) Only S-II is correct (3) Both S-I and S-II are correct (4) Both S-I and S-II are wrong

(3) Both S-I and S-II are correct

Which of the following separate in Anaphase II? (1) Sister chromatids (2) Homologous chromosomes (3) Non-sister chromatids (4) Non-homologous chromosomes

(1) Sister chromatids

In a diploid cell, number of chromosomes is 36 and after colchicine application number of chromosome is (1) 72 (2) 36 (3) 18 (4) 42

(1) 72

Maximum number of meiosis require to produce 40 seeds are – (1) 50 (2) 100 (3) 40 (4) 20

(1) 50

Number of meiosis require to give 100 pollen – (1) 25 (2) 50 (3) 100 (4) 20

(1) 25

Which of the following cell division contributes towards evolution? (1) Amitosis (2) Mitosis (3) Meiosis (4) All of the above

(3) Meiosis