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NEET • BIOLOGY • CELL-CYCLE & CELL DIVISION

Cell-cycle & cell division practice · Medium

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Showing 1-30 of 79 questions

1 Medium

1 of 79

Analyzing +4 | -1

Assertion : Cell growth is a continuous process
in terms of cytoplasmic increase.

Reason : DNA synthesis occurs only during
two specific stages in the cell cycle.

View answer and explanation

Correct option: C

If Assertion is true but Reason is false

Option C is correct. Cell growth is continuous in terms of cytoplasmic increase, but DNA synthesis occurs only during the S phase, making the reason false.

2 Medium

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Understanding +4 | -1

In some organisms, karyokinesis is not followed by cytokinesis as a result of which multinucleate condition arises leading to the formation of syncytium. The perfect example for this is

View answer and explanation

Correct option: B

liquid endosperm in coconut.

Option B (liquid endosperm in coconut) is correct because the liquid endosperm in coconut is a syncytium formed due to karyokinesis not followed by cytokinesis.

3 Medium

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Remembering +4 | -1

Most cytogenic activities occur during

View answer and explanation

Correct option: A

Interphase

The correct answer is A (Interphase) because most cytogenetic activities, such as DNA replication and cell growth, occur during interphase.

4 Medium

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Analyzing +4 | -1

(A) Reduction division occurs in anaphase so there is no need to meiosis
(R) Meiosis II occurs to separate homologous chromosomes

View answer and explanation

Correct option: D

Both A and R is false

Option D (Both A and R is false) is correct because reduction division occurs in meiosis I (not anaphase in general), and meiosis II separates sister chromatids, not homologous chromosomes.

5 Medium

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Understanding +4 | -1

Choose the correct combination of options to select the correct statement for prophase
I. Chromosomal material condenses to form compact mitotic chromosomes
II. The assembly of mitotic spindle is initiated by the microtubules
III. Cells do not show organelles when viewed under the prophase
IV. The nucleolus or nucleoli degenerate completely

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because all the statements accurately describe events during prophase of mitosis.

6 Medium

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Remembering +4 | -1

The plane of alignment of chromosome at the metaphase stage of cell cycle is referred to as the

View answer and explanation

Correct option: B

Metaphase plate

Option B (Metaphase plate) is correct because the metaphase plate is the plane where chromosomes align during metaphase.

7 Medium

7 of 79

Remembering +4 | -1

Replication of centriole occurs during

View answer and explanation

Correct option: A

Interphase

The correct answer is A (Interphase) because centriole replication occurs during the S phase of interphase.

8 Medium

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Understanding +4 | -1

Cell would normally proceed to mitosis without interruption

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Correct option: A

Once it had started the S-period

The correct answer is A (Once it had started the S-period) because once a cell has initiated DNA replication in the S-phase, it is generally committed to completing the cell cycle and proceeding to mitosis.

9 Medium

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Understanding +4 | -1

The M-phase starts with the …A…, corresponding to the separation of daughter chromosomes, known as …B… and usually ends with division of cytoplasm which is known as …C…
Identify A-C to complete the given NCERT statement

View answer and explanation

Correct option: B

A-nuclear division; B-karyokinesis; C-cytokinesis

Option B (A-nuclear division; B-karyokinesis; C-cytokinesis) is correct because the M-phase starts with nuclear division (karyokinesis) and ends with cytoplasmic division (cytokinesis).

10 Medium

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Remembering +4 | -1

Meiosis can be observed in

View answer and explanation

Correct option: D

Spore mother cells

Option D is correct because meiosis occurs in spore mother cells to produce haploid spores.

11 Medium

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Understanding +4 | -1

Which of the following statement is true for cells in

{G_0}

stage of cell cycle?

View answer and explanation

Correct option: C

Cells are metabolically active but no longer proliferate in normal condition

Option C (Cells are metabolically active but no longer proliferate in normal condition) is correct because cells in G0 phase are not inactive but have exited the cell cycle and do not divide.

12 Medium

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Analyzing +4 | -1

Analyze the events occurring during every stage of the cell cycle, how the amount of DNA content
(C) per cell changes and select the correct option.

View answer and explanation

Correct option: D

Both 1 and 2

Option A (DNA content becomes doubled during S phase of cell cycle) is correct because DNA replication occurs during S phase, leading to the doubling of DNA content.

13 Medium

13 of 79

Remembering +4 | -1

After the separation of centromeres during mitosis, the chromatids move towards opposite poles of the spindle. Name the term used for these chromatids

View answer and explanation

Correct option: A

Daughter chromosomes

Option A (Daughter chromosomes) is correct because after centromere separation, each chromatid is considered a daughter chromosome.

14 Medium

14 of 79

Remembering +4 | -1

Separation of linked genes is called

View answer and explanation

Correct option: C

Crossing over

Option C (Crossing over) is correct because it is the process by which linked genes are separated through the exchange of genetic material during meiosis.

15 Medium

15 of 79

Understanding +4 | -1

Select the matched ones.
I . S-phase - DNA replication
II. Zygotene - Synapsis
III. Diplotene - Crossing over
IV. Meiosis - Both haploid and diploid cells
V G_2-phase - Quiescent stage

View answer and explanation

Correct option: A

I and II only

Option A (I and II only) is correct because S-phase is indeed for DNA replication, and Zygotene is when synapsis occurs. Diplotene is marked by the dissolution of the synaptonemal complex and the appearance of chiasmata, not crossing over itself (crossing over happens in Pachytene). Meiosis results in haploid cells, not both haploid and diploid. G2 phase prepares the cell for mitosis; Quiescent stage is G0.

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16 Medium

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Remembering +4 | -1

Chromatid formation takes place in

View answer and explanation

Correct option: A

S-phase

The correct answer is A (S-phase) because chromatid formation, which involves DNA replication, occurs during the S phase of the cell cycle.

17 Medium

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Understanding +4 | -1

Which of the following statements are correct for multicellular cell division?
I. Cell division brings about embryonic development and growth
II. It plays a role in repair and maintenance of the body
III. It is important for reproduction
The correct option is

View answer and explanation

Correct option: D

I, II and III

Option D (I, II and III) is correct because all three statements accurately describe the roles of multicellular cell division.

18 Medium

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Remembering +4 | -1

I. …A… phase corresponds to the interval between mitosis and initiation of DNA replication
II. In animal cells, during the …B… phase, DNA replication begins in the nucleus and the centriole duplicates in the cytoplasm
III. During the …C… phase, proteins are synthesized for the preparation of mitosis, while cell growth continues
Identify the blanks (A-C) to complete the given statements (I-III) with reference to NCERT textbook

View answer and explanation

Correct option: D

A-G_1, B-S, C-G_2

Option D (A-G_1, B-S, C-G_2) is correct because it accurately describes the events occurring in each phase as per the NCERT textbook.

19 Medium

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Remembering +4 | -1

The proteins involved in the movement of chromosomes towards the poles during cell division are

View answer and explanation

Correct option: C

Tubulin

Option C (Tubulin) is correct because tubulin is the protein that forms microtubules, which are the main component of spindle fibers responsible for chromosome movement.

20 Medium

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Remembering +4 | -1

Crossing over occurs at

View answer and explanation

Correct option: C

Four strand stage

Option C is correct because crossing over occurs at the four-strand stage, when the homologous chromosomes have duplicated to form tetrads.

21 Medium

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Understanding +4 | -1

Mitosis or the equational division is usually restricted to …A… cells. However, in some lower plants and in some social insects …B… cells also divide by mitosis.
Choose the correct option for A and B from the given options
A B

View answer and explanation

Correct option: D

Diploid; haploid

Option D (Diploid; haploid) is correct because mitosis is usually restricted to diploid cells, but in some lower plants and social insects, haploid cells can also divide by mitosis.

22 Medium

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Remembering +4 | -1

Spindle fibres formation is not observed in

View answer and explanation

Correct option: D

Amitosis

Option D (Amitosis) is correct because spindle fiber formation is not observed in amitosis, which is a direct cell division method.

23 Medium

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Understanding +4 | -1

Statement-I (S-I): Growth disturbs nucleocytoplasmic ratio.

Statement-II (S-II): Cell division occurs to restore nucleocytoplasmic ratio.

View answer and explanation

Correct option: A

Both Statement-I and Statement-II are true

Option A (Both Statement-I and Statement-II are true) is correct because cell growth does disturb the nucleocytoplasmic ratio, and cell division occurs to restore it.

24 Medium

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Understanding +4 | -1

Which type of cell division occurs in the gonads

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Correct option: C

Both 1 and 2

Option C (Both 1 and 2) is correct because gonads undergo both mitosis for cell proliferation and meiosis for gamete formation.

25 Medium

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Understanding +4 | -1

Which of the following structure will not be common to mitotic cell of a higher plant

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Correct option: C

Centriole

Option C (Centriole) is correct because higher plant cells do not have centrioles, which are involved in spindle fiber organization in animal cells.

26 Medium

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Remembering +4 | -1

Amitosis is the usual process of cell division

View answer and explanation

Correct option: B

Prokaryotic cells

Option B (Prokaryotic cells) is correct because amitosis is the typical cell division method in prokaryotes.

27 Medium

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Understanding +4 | -1

Statement-I(S-I): Growth in plants continues throughout life.

Statement-II (S-II): Plants have self perpetuation cells called meristem.

View answer and explanation

Correct option: A

Both Statement-I and Statement-II are true

Option A (Both Statement-I and Statement-II are true) is correct because plants exhibit continuous growth due to the presence of meristematic cells.

28 Medium

28 of 79

Application +4 | -1

How many meiotic divisions are required to produce 200 seeds in a typical angiosperm?

View answer and explanation

Correct option: C

250

Option C (250) is correct because each seed requires one meiotic division in the egg mother cell and four meiotic divisions for each pollen grain that fertilizes the egg, but only one pollen grain is needed. Therefore, 200 eggs require 200 meiotic divisions, and 200 pollen grains require 200/4 = 50 meiotic divisions. Total = 200 + 50 = 250.

29 Medium

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Application +4 | -1

If a gamete contains 4 pg of DNA with 8 chromosomes, then find out the amount of DNA and number of chromosomes in mother cell during

{G_1}

phase respectively:-

View answer and explanation

Correct option: A

8 pg, 16 chromosomes

Option A (8 pg, 16 chromosomes) is correct because a gamete has half the DNA and half the number of chromosomes as a somatic cell in G1 phase.

30 Medium

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Understanding +4 | -1

I. Chromosomes cluster at opposite spindle poles their identity is lost as discrete elements
II. Nuclear envelope assembles around the chromosome clusters
III. Nucleolus, Golgi complex and ER reform
Above features indicates which phase of mitosis

View answer and explanation

Correct option: B

Telophase

Option B (Telophase) is correct because the listed features are characteristic of telophase, the final stage of mitosis.

Revision notes and key takeaways

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Key Takeaways

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