Sexual Reproduction In Flowering Plants

Question 1

Flower

Answer 1

A fascinating organ of angiosperms

Question 2

Floriculture

Answer 2

It is the study of the efficient production of showy colourful flower

Question 3

An typical flower consists of four whorl such as

Answer 3

Calyx, Corolla, androecium and gynoecium

Question 4

Accessory whorl

Answer 4

Calyx( sepal) Corolla( petal)

Question 5

Reproductive whorl

Answer 5

Androecium ( stamen), gynoecium (carpel)

Question 6

The stalk of the flower is called as

Answer 6

Pedicle

Question 7

Receptacle or thalamus

Answer 7

The whorls of the flower are borne on the expanded tip

Question 8

Function of calyx( the outermost whorl)

Answer 8

Protects the flower in the bud

Question 9

The function of Corolla

Answer 9

Attracts the insects and birds foe pollination

Question 10

Bisexual flower means

Answer 10

A flower which has both androecium and gynoecium

Question 11

A typical stamen has a slender stalk called

Answer 11

Filament

Question 12

The terminal portion generally has bilobed club shaped structure called

Answer 12

Anther

Question 13

Dithecous

Answer 13

A typical angeosprm anther is bilobed with each lobe having two theca

Question 14

Anther meaning

Answer 14

It is the four lobed( tetragonal) structure consisting of four micro sporangia located at the corners, two in each lobe

Question 15

Microsporangia develo into

Answer 15

Pollen sacs

Question 16

Micro sore develops into

Answer 16

Pollen grains

Question 17

The inner most layer of the anther

Answer 17

Tapetum

Question 18

The layers of the anther

Answer 18

Epidermis, endothecium, middle layers, tapetum

Question 19

In young anther, microsporangium contains compactly arranged homogeneous cells called

Answer 19

Sporogenous tissue

Question 20

Microsprogenisis

Answer 20

The process of formation of pollen grains or microspores from the pollen mother cell or microspore mothe cell through meiosis

Question 21

Each cell of a sporogenous tissue is called

Answer 21

Pollen mother cell or microsporo motheer cells

Question 22

Each cell is capable of giving rise to

Answer 22

Microsporotetrad

Question 23

Ploidy of the pollen mother cell

Answer 23

Diploid

Question 24

Ploidy of the microsporo tetrad

Answer 24

Haploid

Question 25

The reason for the name of microsporotetrad

Answer 25

The microspores, ad they are formed, are arranged in cluster of four cells. Hence the name microspore tetrad

Question 26

Male gametophytes of a flower

Answer 26

Pollen grains

Question 27

The diameter of the pollen grains

Answer 27

25-50micrometre

Question 28

The two walls of the pollen grains

Answer 28

Exine and intine

Question 29

Exine is made up of

Answer 29

Spiropollenin

Question 30

Sporopollenin is the most __________ organic material

Answer 30

Resistant

Question 31

Pollen grains can be preserved as

Answer 31

Fossils

Question 32

Exine has prominent apertures called

Answer 32

Germ pores, where sporopollenin is absent

Question 33

The intine is made up of

Answer 33

Cellulose and pectin ( the intine is thin and continuous)

Question 34

What are the two cells that a mature pollen grain consists of

Answer 34

Vegetative cell and generative cell

Question 35

The Vegetative cell is ____ in size and has ____ nucleus

Answer 35

Bigger and irregular

Question 36

The generative cell has ___ shaped cells

Answer 36

Spindal

Question 37

The generative cell divides ......

Answer 37

Mitotically To produce two haploid male gamates

Question 38

Palynology

Answer 38

The study of the pollen grains

Question 39

Pollen grains causes

Answer 39

Allergies and bronchial afflictions

Question 40

The pollen grains can cause the disorder like

Answer 40

asthama, bronchitis

Question 41

Pollen allergy in humans are caused by

Answer 41

Parthenium or carrot grass

Question 42

The advantages of the polen grains

Answer 42

1) they are rich in nutrients 2) pollen tablets ar used as food suppliments 3) int the western countries large number of pollen products in the form of tablets and syrups are available in the market 4) large number of pollen grains can be preserved for many years in liquid nitrogen at -196°C ✨. Such stored pollen far can be used as pollen banks,in crop breeding programme 5) pollen consumption has been increase the performance of athlets and race horses

Question 44

Viability of the pollen grains depends upon

Answer 44

Availability of temperature and humidity

Question 45

In some cereals like rice and wheat, pollen grains lose viability within

Answer 45

30 minutes of their release

Question 46

The pollen grains of some members of ________, ________ and _______remain viable fo several months

Answer 46

Rosaceae, liguminaceae, solanaceae

Question 47

Each microsporangium has hundred microspore mother which produce _____ microspore by ______

Answer 47

400 by meiosis

Question 48

In an anther there are 4 microsporangia . So the total number of microspores will be 4×400=

Answer 48

1600 male gametophytes can be produced as each microspres produce one male gametophyte