Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 80

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Weekly Quiz Competition

Question 1
1 / -0

Which one of the following statements is/are not true for meiosis?

A
It occur in reproductive tissue only

B
Chromosome undergo pairing in early prophase I

C
Chromosome do not exchange their segments

D
Centromere do not divide during anaphase I

Solution

Meiosis is also known as reductional division. It is made up of two stages Meiosis I and Meiosis II and takes place in the reproductive tissue. During the cell division, the mother cell divides to give rise to four daughter cells but with reduced number of chromosomes. The number of chromosomes in each daughter cells is half the number of chromosomes. The homologous exchange of DNA material takes place during the crossing over of chromosomes during the Pachytene stage of Prophase I of Meiosis I.
So, the correct answer is option C.
Question 2
1 / -0

The constancy of the chromosome number in sexually producing generation is brought by the process of

A
Meiosis

B
Mitosis

C
Amitosis

D
None of the above

Solution

The constancy of the chromosome number in a sexually producing generation is brought by the process of meiosis. As the number of chromosomes is halved during meiosis, this allows gametes to fuse (i.e., fertilization) to form a zygote containing a mixture of paternal and maternal chromosomes. Thus, meiosis and fertilization facilitate sexual reproduction with successive generations maintaining the same number of chromosomes.
So, the correct answer is option A.
Question 3
1 / -0

If the number of bivalents are 8 in metaphase I, what shall be the number of chromosomes in daughter cells after meiosis I and meiosis II respectively.

A
8 and 4

B
4 and 4

C
8 and 8

D
16 and 8
Solution
Correct Option: C

Explanation:
- In bivalent condition, there are two chromosomes present with their homologous pair.
- So, 8 bivalents in metaphase I contains 16 chromosomes.
- Meiosis I is a reduction division and therefore the number of chromosomes is halved to 8 chromosomes.
- Meiosis II is an equational division and therefore the number of chromosomes remains same, that is, 8 chromosomes.
Hence, if the number of bivalents is 8 in metaphase I, the number of chromosomes in daughter cells after meiosis I and meiosis II respectively will be 8 and 8.
Question 4
1 / -0

The stain for cell division is

A
Saffranin

B
Aniline blue

C
PAS

D
Acetocarmine

Solution

The process to study cell division in laboratories is by preparing the microscopic slide with growing root tips and the most commonly used is Onion. The root tips are taken and flattened on a microscopic slide. To be able to observe the chromosome clearly the onion root tip cells are treated with DNA specific stains such as Acetocarmine or Feulgen. This helps the different stages of the supercoiled chromosomes to be visible under the microscope.
So, the correct answer is option D.
Question 5
1 / -0

Number of cells obtained by meiosis is

A
2

B
4

C
6

D
8

Solution

Meiosis is a specialized type of cell division which reduces the chromosome number by half. This process occurs in all sexually reproducing eukaryotes both single celled and multicellular including animals, plants and fungi. In meiosis, DNA replication is followed by two rounds of cell division to produce four daughter cells with half the number of chromosomes as the original parent cell. The two meiotic divisions are known as meiosis I and meiosis II.
Question 6
1 / -0

After meiosis I, the two chromatids of a chromosome are

A
Genetically similar

B
Genetically different

C
There occurs only one chromatid in each chromosome

D
None of the above

Solution

After meiosis I, the two chromatids of a chromosome are genetically different. Meiosis I segregates homologous chromosomes, producing two haploid cells. Because the ploidy is reduced from diploid to haploid, meiosis I is referred to as a reductional division.
Question 7
1 / -0

In which stage, the centromere lie at equator and arms are directed towards poles?

A
Metaphase of mitosis

B
Metaphase I

C
Metaphase II

D
Both A and C

Solution

A. In the metaphase of mitosis, chromosomes lie over the equator of the spindle and are organised into a plate-like structure called equatorial plate or metaphasic plate. In this plate, centromeres of the chromosomes lie over the equator, and arms of the chromosomes are directed towards the poles.
B. In Metaphase - I of meiosis, bivalents lie over the equator of the spindle. In this, centromere does not lie at equator and arms are not directed towards poles.
C. In the metaphase - II of meiosis also, chromosomes lie over the equator of the spindle, and are organised into a plate-like structure called equatorial plate or metaphasic plate. In this plate, centromeres of all chromosomes lie over the equator of the spindle, and arms are directed towards the poles.
D. Both A and C
Thus, the correct answer is 'Metaphase of mitosis and Metaphase II'.
Question 8
1 / -0

Equatorial plate is found in which of the following stages?

A
Metaphase

B
Prophase

C
Telophase

D
Anaphase

Solution

Equatorial plate (metaphase plate) found in metaphase. In metaphase, the centromeres of the chromosomes arrange themselves at the equator which is equidistant from the two centrosome poles.
So, the correct answer is option A.
Question 9
1 / -0

V, J and L shaped chromosome occur in which of the following?

A
Prophase

B
Anaphase

C
Metaphase

D
Telophase

Solution

V, J, and L-shaped chromosome occurs in anaphase. During this phase, the centromeres are split, and the new daughter chromosomes are pulled toward the poles. They take on a V-shape as they are pulled back. While the chromosomes are drawn to each side of the cell, the non-kinetochore spindle fibers push against each other, in a ratcheting action, that stretches the cell into an oval. Once anaphase is complete, the cell moves into telophase.
So, the correct answer is option B.
Question 10
1 / -0

Which of the following is the most primitive type of mitosis?

A
Amitosis

B
Cryptomitosis

C
Endomitosis

D
Zygotic mitosis

Solution

The most primitive type of mitosis is cryptomitosis or promitosis. Cryptomitosis is a type of nuclear division in certain protozoa characterized by the formation of a modified achromatic spindle and by the absence of differentiated chromosomes.
So, the correct answer is option B.

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Cell Cycle and Cell Division Test - 80

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Cell Cycle and Cell Division Test - 80

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SHARING IS CARING

Question 1

It occur in reproductive tissue only

Chromosome undergo pairing in early prophase I

Chromosome do not exchange their segments

Centromere do not divide during anaphase I

Solution

Question 2

Meiosis

Mitosis

Amitosis

None of the above

Solution

Question 3

8 and 4

4 and 4

8 and 8

16 and 8

Solution

Question 4

Saffranin

Aniline blue

PAS

Acetocarmine

Solution

Question 5

2

4

6

8

Solution

Question 6

Genetically similar

Genetically different

There occurs only one chromatid in each chromosome

None of the above

Solution

Question 7

Metaphase of mitosis

Metaphase I

Metaphase II

Both A and C

Solution

Question 8

Metaphase

Prophase

Telophase

Anaphase

Solution

Question 9

Prophase

Anaphase

Metaphase

Telophase

Solution

Question 10

Amitosis

Cryptomitosis

Endomitosis

Zygotic mitosis

Solution

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