What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its roots tip cells?

1. 21                       

2. 42                         

3. 63                   

4. 84

The drug colchicines, used to obtain polyploidy cells, acts on the cytoskeletal structures of

the plant cells called

1. microtubules

2. actin filaments

3. intermediate filaments

4. all of the above.

Number of mitotic division required in a cell of root tip for formation of 128 cells is

1. 12

2. 3

3. 7

4. 6

Microtubule depolymerizing drug such as colchicine is expected to 

(1) inhibit spindle formation during mitosis 

(2) inhibit cytokinesis

(3) allow mitosis beyond metaphase

(4) induce formation of multiple contractile

Which of the following statements is True?
(1) Cell plate represents the middle lamella between the walls of two adjacents cells

(2) At the time of cytokinesis, organelles like mitochondria and plastids get distributed between the daughter cells

(3) Cytokinesis in plant cell is centrifugal and takes place by cell-plate formation while animal cells by furrowing / cleavage and is centripetal

(4) All are correct

Cytokinesis in animal cell takes place by _______; in _______ direction while in plant cell by _______; in _______ direction:

(1) Furrowing, centrifugal, cell plate, centripetal

(2) Furrowing, centripetal, cell plate, Centrifugal

(3) Cell plate, centrifugal, furrowing, centripetal

(4) Cell plate, centripetal, furrowing, centrifugal

A. Most dramatic period of cell cycle involving a major reorganization of virtually all components of the cell
B. It represents the phase when the actual cell division occurs
These statements (A & B) are concerned with
1. S-phase
2. G₁ phase
3. M-phase
4. G₂ phase

Plant cells do not divided their cytoplasm by forming a furrow in cell membrane like animal cells rather they divide by cell plate because

Cell growth is a continuous process in terms of

1.      Increase in protein content

2.      Increase in DNA content

3.      Increase in cytoplasmic content

4.     Increase in RNA content

After M Phase the number of chromosomes will be

1.      Same as that of G1

2.      Double as that of G2

3.      Half as that of S

4.     None of these