Mitotis

Q.

How are spindle Fibre formed in plant cells

Q. Match the events given in Column A with the stage in mitotic cell division in Column B. [4 MARKS]

Column 'A'	Column'B'
(a) Chromosomes get in a horizontal plane at the equator	Anaphase
(b) Daughter chromosomes move to the opposite poles of a spindle	Prophase
(c) Chromosomes become visible as fine long threads	Telophase
(d) Chromosomes lose their distinctiveness and gradually become transformed into a chromatin network	Metaphase

Q.

After mitotic cell division, a female human cell will have:

1. 44 + xx chromosome

2. 44 + xy chromosome

3. 22 + x chromosome

4. 22 + y chromosome

Q.

Identify the stages of Prophase I, going from left to right, from the images below.

1. Zygotene, Pachytene, Diplotene, Diakinesis, Leptotene.

2. Diplotene, Diakinesis, Leptotene, Zygotene, Pachytene.

3. Leptotene, Zygotene, Pachytene, Diplotene, Diakinesis.

4. Pachytene, Diplotene, Diakinesis, Pachytene, Diplotene.

Q.

Where does DNA replication occur in mitosis?

Q. Arrange the following stages of mitosis in proper order.

1. 2, 1, 4, 3
2. 4, 2, 1, 3
3. 2, 3, 1, 4
4. 1, 2, 4, 3

Q.

Why do centromeres of chromosomes not split during anaphase I?

Q. How do organisms, whether reproduction asexual or sexually maintain a constant chromosome number through several generations?? Explain with the help of suitable example

Q. How is chromosome number restored in tht zygote??

Q.

Where can mitosis occur?

Q.

The pairing of homologous chromosomes takes place in ____________ phase.

Q. There are three major ways in which different cells handle pyruvic acid produced by glycolysis, these are

1. Alcoholic fermentation, Oxaloacetic acid fermentation, Citric acid fermentation
2. Alcoholic fermentation, Lactic acid fermentation, Citric acid fermentation
3. Lactic acid fermentation, Alcoholic fermentation, Aerobic respiration
4. Oxaloacetic acid fermentation, Lactic acid fermentation, Aerobic respiration

Q. Which of the following are the different products of fermentation?

1. Alcohol
2. Vinegar
3. Acetyl Co-A
4. Lactic acid

Q. The figure given below shows a certain stage of cell division with four chromosomes. [5 MARKS]


(a) Name the parts of the chromosome labeled A and B.
(b) Name the structure C. What is its function?
(c) Name the type of division. Give a reason.
(d) Name the stage of division.
(e) What is the diploid number for the organism from which the cell is taken?

Q.

What are mitosis and cell division?

Q. At the end of mitosis:

1. Two diploid daughter cells are formed. Chromosome number is same as that of parent cell.
2. Two diploid daughter cells are formed. Chromosome number is half of the parent cell.
3. Two haploid daughter cells are formed. Chromosome number is same as that of the parent cell.
4. Four haploid daughter cells are formed. Chromosome number is the same as the parent cell.

Q.

_____ is the division of cytoplasm.

Q.

Give two important characteristic features of stem cells?

Q.

Skin cells are continuously replaced by the process called__.

Q. Most organelles duplicate in G1 phase but mitochondria, Golgi bodies duplicate in G2 phase, Why??

Q. Study the following column and choose the correct option.

A.	Initiation of spindle fibres	1.	Anaphase-I
B.	Synthesis of RNA and protein	2.	Zygotene
C.	Action of endonuclease	3.	G1-phase
D.	Movement of chromatids towards opposite poles	4.	Pachytene
		5.	Anaphase-II

1. a
2. b
3. c
4. d

Q.

In cell division, proteins are involved in the formation of:

1. Achromatic figure

2. Asters

3. All of these

4. Spindle fibres

Q.

What happens in the prophase of mitosis?

Q. Identify the wrong statement about meiosis
1. Pairing of homologous chromosomes.
2. Four haploid cells are formed.
3. The number of chromosomes is reduced to half.
4. Two cycles of DNA replication occurs.

1. Decondensation from chromosomes and reassembly of the nuclear lamina
2. Transcription from chromosomes and reassembly of the nuclear lamina
3. Formation of the contractile ring and formation of the phragmoplast
4. Formation of the contractile ring and transcription from chromosomes

Q.

Mention the difference between mitosis and meiosis with reference to:

Number of daughter cells formed at the end of cell division.

Q. Onion root tip cells have 16 chromosomes in each cell. How many chromosomes will the cell have at $G_1$ phase, after S phase, and after M phase?

Q. In mitosis, the number of chromosomes in each daughter cells is _____ in/the mother cell.

1. half the number in
2. same as
3. twice the number in
4. triple the number in

Q. Each bivalent appears to have four chromatids called ___ or ___ .

1. tetrads
2. polypeptide
3. quadrivalents
4. Diplotene

Q.

What happens at the G2 M checkpoint?

Q.

Which of the following is not a characteristic of alveoli?

1. Thin membrane

2. Small surface area

3. Surrounded by rich network of blood capillaries.

4. Balloon-like structures