Given below is a diagram representing a stage during mitotic cell division in an animal cell. Examine it carefully and answer the questions which follow.

(a) Identify the stage. Give one reason in support of your answer.

(b) Name the cell organelle that forms the 'aster'.

(c) Name the parts labelled 1, 2 and 3.

(d) Name the stage that follows the one shown here. How is that stage identified?

(e) Mention two points of difference between mitosis and meiosis with regard to:

1. The number of daughter cells produced.
2. The chromosome number in the daughter cells.

Given below are three diagrammatic sketches (A, B and C) of one and the same particular phase during mitotic type of cell division.

(a) Identify the phase.

(b) What is the diploid number of chromosomes shown in them?

(c) Identify whether A, B, C are animal or plant cells? Give reasons.

Shown below are four stages (A, B, C, D) (not in sequence) of a certain kind of cell division.

(a) Is it a plant cell or an animal cell? Give two reasons.

(b) Is it undergoing mitosis or meiosis?

(c) What should be the correct sequence of these four stages among themselves?

(d) Name the stage that should precede the earliest of these stages.

(e) Draw the stage named above inside the blank space provided.

Cell division is a part of a long series of events called the cell cycle. The cell cycle consists of two main phases — interphase and the division phase. There are two types of cell divisions which occur in our body for growth, repair replacement and gamete formation. Mitosis and meiosis mainly differ from each other with respect to the number of daughter cells produced, the number of chromosomes in the daughter cells and the purpose of division, etc.

(i) Both kinds of cell divisions start after the completion of interphase which includes G-1 phase, S-phase and G-2 phase. Interphase is the preparatory phase. Choose the correct statement from the options given below :

1. Mitosis occurs in each and every cell of the human body.
2. Chromatids split into two homologous chromosomes during prophase.
3. Chromatin fibres become distinct and develop into chromosomes during prophase.
4. RNA and histamines are the components of chromatin.

(ii) Interphase is the longest part of the cell cycle which lies between two successive cell divisions. Choose the incorrect statement from the options given below:

1. Interphase is followed by karyokinesis and then cytokinesis at last.
2. Synthesis of RNAs and proteins occurs actively in the first growth phase (G-1 phase).
3. Interphase also occurs between equational and reductional division phases of meiosis.
4. Replication or duplication of DNA occurs in the synthesis phase (S-phase).

(iii) Daughter cells formed from one parent cell after the two phases of meiosis (equational and reductional) are:

1. Identical and diploid
2. Four daughter cells are produced with haploid chromosome number.
3. Two daughter cells are produced with diploid chromosome number.
4. Both (a) and (c)