Test on 'Cell Cycle And Cell Division' - Chapter 10 | Class 11th | Biology | NCERT Exemplar

 Test on 'Cell Cycle And Cell Division' - Chapter 10 | Class 11th | Biology | NCERT Exemplar

1. Meiosis occurs in organisms during

a. Sexual reproduction                                                b. Vegetative reproduction           

c. Both sexual and vegetative reproduction               d. None of the above

 

2. Mitosis is characterized by

a. Reduction division                                                    b. Equal division 

c. Both reduction and equal division                            d. Paining of homologous chromosomes

 

3. Cells which are not dividing are likely to be at

a. G1                      b. G2                      c. Go                      d. S phase

 

4. Identify the wrong statement about meiosis

a. Pairing of homologous chromosomes                                                    

b. Four haploid cells are formed

c. At the end of meiosis the number of chromosomes are reduced to half                    

d. Two cycle of DNA replication occurs

 

5. Select the correct statement about G1 phase

a. Cell is metabolically inactive                                               b. DNA in the cell does not replicate

c. It is not a phase of synthesis of macromolecules                 d. Cell stops growing

 

Very Short Question:

 

1. Which tissue of animals and plants exhibits meiosis?

 

2. What attributes does a chromatid require to be classified as a chromosome?

 

3. An anther has 1200 pollen grains. How many pollen mother cells must have been there to produce them?

 

4. It is observed that heart cells do not exhibit cell division. Such cells do not divide further and exit ___________ phase to enter an inactive stage called ___________ of cell cycle. Fill in the blanks.

 

5. In which phase of meiosis are the following formed? Choose the answers

from hint points given below.

a. Synaptonemal complex ____________________________

b. Recombination nodules ____________________________

c. Appearance/activation of ____________________________

enzyme recombinase

d. Termination of chiasmata ____________________________

e. Interkinesis ____________________________

f. Formation of dyad of cells ____________________________

 

Hints: 1) Zygotene, 2) Pachytene, 3) Pachytene, 4) Diakinesis, 5) After Telophase-I /before Meosis-II, 6) Telophase-I /After Meiosis-I.

 

 

Short Questions:

1. The following events occur during the various phases of the cell cycle,

Name the phase against each of the events.

a. Disintegration of nuclear membrane _________________________

b. Appearance of nucleolus _________________________

c. Division of centromere _________________________

d. Replication of DNA _________________________

 

2. Name the pathological condition when uncontrolled cell division occurs.

 

3. How does cytokinesis in plant cells differ from that in animal cells?

 

Long Answer Questions:

 

1. Write brief note on the following

a. Synaptonemal complex

b. Metaphase plate

 

2. An organism has two pair of chromosomes (i.e., chromosome number = 4).

Diagrammatically represent the chromosomal arrangement during different phases of meiosis-II.