The sequence of events by which a cell duplicates its genome, synthesises other constituents of cells and eventually divides into daughter cells is termed as:

1. Interphase                                   

2. M-phase

3. Karyokinesis + Cytokinesis             

4. Cell cycle

Which one is correct for G₀ stage?
I. It is a quiescent stage
II. In this phase cell cycle is stopped
III. G₀ cells in this stage do not grow or proliferate but metabolically active
IV. G₀ cells can divide in response to some stimulus
(1) All are correct                         

(2) I, II, III are correct

(3) I, II are correct                       

(4) Only I and IV are correct

Which of the following statements is false?
(1) Mitosis or the equational division is usually restricted to the 2N cells only

(2) In onion 2N = 16

(3) Growth and reproduction are characteristics of cells indeed of all living organism

(4) In plants meristematic tissues show meiosis

At metaphase of mitosis, each chromosome consists of _______ chromatid(s) _______ centromere(s) ________ kinetochore(s) and _______ molecules of DNA:

(1) 2, 1, 2, 2        

(2) 2, 2, 2, 2       

(3) 2, 1, 1, 1                  

(4) 2, 1, 2, 1

In human cells chromosomes are:

(1) Always condensed during the entire cell cycle

(2) Different in different tissues

(3) Of the same size and shape

(4) Visible only during mitosis and meiosis

In prophase mitosis, which one of the following events occurs in animal cells but not in plant cells?

(1) Centrioles migrate to opposite sides of the nucleus

(2) Homologous chromosomes do not associate

(3) The nuclear envelope (membrane) breaks down

(4) Nucleoli disappear

Synaptonemal complex is more conspicious at:

(1) Zygotene        

(2) Pachytene      

(3) Diplotene         

(4) Leptotene

Centrosomes are:

(1) Constricted regions of chromosomes

(2) Regions where microtubules polymerise

(3) Part of Cilia

(4) The central part of the same cell

Cellular structures which disappear during late prophase and reappear during telophase are:

(1) Mitochondria and spindle fibres   

(2) Plasma membrane

(3) Nuclear membrane and nucleolus 

(4) Plastid

Given:
1. Chromatid                                    2. Monad
3. Dyad                                            4. Daughter chromosome
The correct sequence in cell division is:
(a) 1, 2, 3, 4               (b) 2, 3, 1, 4              (c) 3, 2, 1, 4              (d) 4, 3, 2, 1