Cell :the unit of life

Question 1

what are the largest and second largest cell organelles.

Answer 1

Chloroplast is the largest and mitochondria is the second largest.

Question 2

Why nucleus is not added in the cell organelles.

Answer 2

Because nucleus is the controlling centre of the cell.

Question 3

Where
did the metabolic activites occur in cell.

Answer 3

Cytoplasm is the place where 75% metabolic activities occur.

Question 4

Example of prokaryotes.

Answer 4

Bacteria, blue green algae(cyanobacteria) and mycoplasma/PPLO(pleural pneumonia like organism).

Question 5

What does it mean by “well organised nucleus is absent”.

Answer 5

it means genetic material(DNA) is not enclosed by cell nuclear membrane.

Question 6

Cells having membrane bounded nuclei are called.

Answer 6

Eukaryotic cells.

Question 6

Prokaryotes have cell wall surrounding the cell membrane except in.

Answer 6

Mycoplasma/ PPLO(pleuro pneumonia like organism)

Question 7

Bacterias having small circular(DNA) outside the genomic DNA are called.

Answer 7

Plasmids (not plastids)

Question 8

Foldings of nuclear membrane are called.

Answer 8

Measosome

Question 8

plant cell are much larger than animal cell because.

Answer 8

for adjustment of sap vacuole and plastids/chloroplast.

Question 9

cytology is the study of.

Answer 9

study of structure and function of cell.

Question 10

function of microvilli.

Answer 10

in intestinal cell for absorption of liquid food.

Question 11

membrane of nucleus is also known as.

Answer 11

karyotheca

Question 12

the most abundant organic substance is

Answer 12

protein

Question 13

what is the smallest cell organelle in both plants and animals.

Answer 13

ribosome

Question 14

most common shape in bacteria.

Answer 14

baccillus(rod like)
flagilla may/ may not present.

Question 15

define glycocalyx, what are the two forms in which glycocalyx exist.

Answer 15

glycocalyx (glyco-sugar, calyx-layer)
the two forms are-
*thick and tuff called capsule
these forms are dangerous, smooth in touch and without surface structures.
*if it is loose sheet then it is called slime layer.

Question 16

write four features of cell wall.

Answer 16

cell wall gives structure prevent the cell from bursting.