Cell Division and Functions

Q.

During what stage of the cell cycle does DNA replication occur?

Q.

What type of cells undergo mitosis?

Q.

What are the three functions of Mitosis and Cytokinesis?

Q.

Which of the following is not a characteristic feature during mitosis in somatic cells ?

1. Disappearance of nucleolus.

2. Chromosome movement

3. Synapsis

4. Spindle fibres.

Q.

Which of the following is not a part of interphase?

1. G₁ phase

2. M phase

3. G₂ phase

4. S phase

Q.

The given diagram shows a stage during mitotic division in an animal cell:

1. Identify the stage. Give a reason to support your answer.
2. Draw a neat labeled diagram of the cell as it would appear in the next stage. Name the stage.
3. In what two ways is cytokinesis in an animal cell different from the cytokinesis in a plant cell?
4. Name the type of cell division that occurs during-

1. Growth of a shoot.
2. Formation of pollen grains.

Q.

What happens to DNA replication during interkinesis?

Q.

What is crossing over in meiosis?

Q.

What is a vegetative cell?

Q.

Which of the following does not occur in the S phase of the cell cycle?

1. DNA replication

2. Histone synthesis

3. Nucleosome replication

4. Nuclear Division

Q.

What causes recombination?

Q.

What follows interkinesis?

Q.

What are examples of mitosis?

Q.

With reference to the cell division explain the following term:

Chromatid

Q.

Karyokinesis refers to the division of the nucleus.

1. True
2. False

Q.

What are Protofilaments?

Q.

Does the number of chromosomes remain the same as produced by Meiosis I?

Q.

Is synapsis a characteristic feature seen during mitosis in the somatic cells?

Q.

Name the stage of mitosis where the following occurs:

1. Spindle fibres appears.
2. Chromosomes are lined up in one plate at equator.
3. Centrioles start moving apart.
4. Nuclear membrane is formed.
5. Cytokinesis begins.

Q.

Equatorial plate is formed during

1. Prophase.

2. Anaphase.

3. Metaphase.

4. Telophase.

Q.

Why is cleavage not possible in plant cells?

Q.

Mitotic poison is:

1. Nitrate

2. Carbon dioxide

3. Colchicine

4. Trehalose

Q.

Is crossing over rare?

Q.

What happens to the bivalent chromosomes in metaphase I?

Q.

Where can nuclear dimorphism be seen?

Q.

What does mitosis mean?

Q. Why DNA replication always takes place in 5 to 3 direction?

Q.

Which of the following statements are wrong?
(i) Mitosis involves two sequential divisions, mitosis I and mitosis II.
(ii) Meiosis results in the formation of four daughter cells with half the number of chromosomes.
(iii) Simple permanent tissues are made up of only one type of cell.
(iv) Collenchyma provides stiffness to the plant body.

1. Band C

2. A and D

3. C and D

4. Band D

Q.

Is recombination and crossing over the same?

Q.

How long does the M phase last?