Nucleus constrict followed by cytoplasmic division

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NEET • BIOLOGY • CELL-CYCLE & CELL DIVISION

Cell-cycle & cell division practice · Mixed difficulty

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Showing 91-120 of 168 questions

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91 Medium

91 of 168

Understanding +4 | -1

Assertion: Meiosis-I is reductional divison while meiosis-II is equational division.

Reason: In meiosis-I chromosome numbers become half in compare to parental cell while in meiosis-II no change in chromosome number.

View answer and explanation

Correct option: A

Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

Option A (Both Assertion and Reason are true and Reason is the correct explanation of Assertion) is correct because Meiosis I is a reductional division where the chromosome number is halved, and Meiosis II is equational, maintaining the chromosome number.

92 Medium

92 of 168

Understanding +4 | -1

The second meiotic division leads to

View answer and explanation

Correct option: C

Separation of chromatids and centromere

Option C (Separation of chromatids and centromere) is correct because meiosis II is essentially a mitotic division of haploid cells, leading to the separation of sister chromatids at the centromere.

93 Easy

93 of 168

Remembering +4 | -1

Which of the protein is found in spindle fibre?

View answer and explanation

Correct option: A

Tubulin

Option A (Tubulin) is correct because spindle fibers are primarily composed of tubulin protein.

94 Medium

94 of 168

Remembering +4 | -1

During cell cycle, RNA and non-histone proteins are synthesized in

View answer and explanation

Correct option: C

{G_1}

-phase

Option C (

{G_1}

-phase) is correct because RNA and non-histone proteins are synthesized during the

{G_1}

phase of the cell cycle.

95 Medium

95 of 168

Understanding +4 | -1

Mitosis usually results in the

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because mitosis results in diploid daughter cells, growth of multicellular organisms, and cell repair.

96 Medium

96 of 168

Remembering +4 | -1

During, meiosis-I, the bivalent chromosomes clearly appear as tetrads during

View answer and explanation

Correct option: D

Pachytene

Option D is correct because during pachytene of meiosis-I, the bivalent chromosomes clearly appear as tetrads.

97 Easy

97 of 168

Remembering +4 | -1

Chromosomes are visible with chromatids at which phase of mitosis?

View answer and explanation

Correct option: C

Metaphase

Option C is correct because chromosomes are most clearly visible with chromatids during metaphase of mitosis due to their maximum condensation.

98 Medium

98 of 168

Analyzing +4 | -1

Assertion (A): If the chromosome number is

2n

during

G_1,

after

S

phase the chromosome number is the same
Reason (R): After

S

phase there is no increase in DNA per cell
The correct option among the following is

View answer and explanation

Correct option: C

A is true, but R is false

Option C (A is true, but R is false) is correct because the chromosome number remains the same after S phase, but the DNA content doubles.

99 Easy

99 of 168

Understanding +4 | -1

Choose the correct sequence of two main events in mitosis

View answer and explanation

Correct option: A

Karyokinesis followed by cytokinesis

Option A (Karyokinesis followed by cytokinesis) is correct because karyokinesis (nuclear division) precedes cytokinesis (cytoplasmic division) in mitosis.

100 Easy

100 of 168

Understanding +4 | -1

Which is synthesized in

{G_1}

-phase?

View answer and explanation

Correct option: A

DNA polymerase

The correct answer is A (DNA polymerase) because DNA polymerase is essential for DNA replication, which the cell prepares for during the

{G_1}

phase.

101 Easy

101 of 168

Remembering +4 | -1

Which of the following events occurs during

{G_1}

-phase?

View answer and explanation

Correct option: B

Growth and normal function of cell

Option B (Growth and normal function of cell) is correct because the G1 phase is characterized by cell growth and normal cellular functions.

102 Easy

102 of 168

Remembering +4 | -1

Which of the following are properties of reserved cells?

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Correct option: D

They are undifferentiated and they have capacity of cell division

Option D is correct because reserved cells are undifferentiated and retain the capacity for cell division, allowing them to contribute to growth and repair.

103 Medium

103 of 168

Application +4 | -1

The least number of meiotic divisions to form 120 seeds in a typical angiospermic plant is

View answer and explanation

Correct option: A

150

Option A (

150

) is correct because to form 120 seeds, 120 fertilizations are required. This means 120 eggs and 120 pollen grains are needed. To produce 120 eggs, 120/1 = 120 meiotic divisions are required. To produce 120 pollen grains, since one meiosis produces 4 pollen grains, 120/4 = 30 meiotic divisions are required. Therefore, the total number of meiotic divisions is 120 + 30 = 150.

104 Easy

104 of 168

Remembering +4 | -1

Which of the following phase of cell cycle is also known as the resting phase?

View answer and explanation

Correct option: D

Interphase

Option D (Interphase) is correct because interphase is the period between successive M-phases and is often referred to as the resting phase.

105 Easy

105 of 168

Remembering +4 | -1

DNA replication in a cell cycle occurs during

View answer and explanation

Correct option: B

S-phase

Option B (S-phase) is correct because DNA replication occurs during the S-phase of the cell cycle.

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106 Hard

106 of 168

Remembering +4 | -1

At which stage of cell cycle colchicine arrests the spindle?

View answer and explanation

Correct option: A

Anaphase

Option A (Anaphase) is correct because colchicine disrupts spindle fiber formation, arresting cells in metaphase or anaphase.

107 Hard

107 of 168

Understanding +4 | -1

In …A…. phase, there is synthesis of RNAs and proteins that are needed for cell growth and replication of DNA. While it is …B… phase, where synthesis of protein occur that is needed for spindle formation and mitosis to continue. Identify A and B to complete the given statement

View answer and explanation

Correct option: C

A-

{G_1}

; B-

{G_2}

Option C (A-G1; B-G2) is correct because G1 phase involves synthesis of RNAs and proteins for cell growth and DNA replication, while G2 phase involves synthesis of proteins for spindle formation and mitosis.

108 Medium

108 of 168

Remembering +4 | -1

Two basic stages of cell cycle are

View answer and explanation

Correct option: A

Interphase and M-phase/divisional phase

Option A (Interphase and M-phase/divisional phase) is correct because the cell cycle is broadly divided into interphase (growth and DNA replication) and the M-phase (mitosis and cytokinesis).

109 Medium

109 of 168

Remembering +4 | -1

Yeast cell cycle duration is

View answer and explanation

Correct option: C

1\frac{1}{2}hour

Option C (

1\frac{1}{2}hour

) is correct because the yeast cell cycle duration is approximately 90 minutes, which is equal to 1.5 hours.

110 Hard

110 of 168

Remembering +4 | -1

Choose the correct answer for the statements given below
I. Protein involved in the shortening and thickening of chromosome fibres
II. The name of early prophase when elongated chromosomes occur in overlapped condition like a ball of wool without their ends being visible
III. Each group of astral rays along with its centriole pair
IV. Name the narrow point which is responsible for attaching two sister chromatids to each other

View answer and explanation

Correct option: C

I-Codensins, II-Spirme stage, III-Aster, IV-Centromere

Option C (I-Codensins, II-Spirme stage, III-Aster, IV-Centromere) is correct as it correctly matches each description to its term.

111 Hard

111 of 168

Understanding +4 | -1

Arrange the following events of meiosis in the correct sequence.
I. Terminalization
II. Crossing over
III. Synapsis
IV. Disjunction of genomes
The correct sequence is

View answer and explanation

Correct option: B

3, 2, 1, 4

Option B (3, 2, 1, 4) is correct because it represents the correct sequence of events in prophase I of meiosis: Synapsis, Crossing over, Terminalization, and Disjunction of genomes.

112 Easy

112 of 168

Application +4 | -1

What will be the amount of DNA in meiosis II product if meiocyte is containing 20 pg DNA in

G_1

phase?

View answer and explanation

Correct option: A

10 pg

Option A (10 pg) is correct because during meiosis I, DNA content halves, and during meiosis II, it halves again, so starting with 20 pg in G1, the product of meiosis II will have 10 pg.

113 Easy

113 of 168

Understanding +4 | -1

I. The cells that do not divide further, exit

{G_1}

-phase to enter an inactive stage called …A… phase of the cell cycleII. The cells that are in

{G_{^2}}

-phase definitely continue with the …B… phase.Identify A and B to complete the given NCERT statements

View answer and explanation

Correct option: D

A - {G_0};B - M

The correct answer is D (

A - {G_0};B - M

) because cells that exit the cell cycle enter the

{G_0}

phase, and cells in

{G_2}

proceed to the M phase.

114 Hard

114 of 168

Remembering +4 | -1

A cell cycle includes?

View answer and explanation

Correct option: A

Interphase and M- phase

The correct answer is A (Interphase and M- phase) because the cell cycle is fundamentally divided into interphase (growth and preparation) and the M-phase (mitosis or meiosis).

115 Medium

115 of 168

Remembering +4 | -1

Amitosis is

View answer and explanation

Correct option: D

All the above

Option D (All the above) is correct because amitosis is a direct cell division observed in unicellular organisms where the nucleus constricts followed by cytoplasmic division.

116 Medium

116 of 168

Analyzing +4 | -1

Assertion: Mitosis does play a role in gamete formation.

Reason: Haploid organism divide by mitosis.

View answer and explanation

Correct option: B

Both assertion & reason are true but the reason is not the correct explanation of the assertion

Option B is correct. Mitosis does play a role in gamete formation in haploid organisms, and haploid organisms do divide by mitosis, but the reason doesn't explain why mitosis plays a role in gamete formation.

117 Medium

117 of 168

Application +4 | -1

If a male gamete in a flowering plant contains 20

pg

DNA

and 8 chromosomes, what would have been the number of chromosomes and

DNA

content in its microspore mother cell at

{G}_1

phase?

View answer and explanation

Correct option: C

pg\, DNA

and 16 chromosomes

Option C (40

pg\, DNA

and 16 chromosomes) is correct because the microspore mother cell is diploid and has twice the DNA content and chromosome number of the male gamete.

118 Easy

118 of 168

Remembering +4 | -1

Crossing over occurs during

View answer and explanation

Correct option: C

Pachytene

Option C is correct because crossing over, the exchange of genetic material between non-sister chromatids, occurs during the pachytene stage of prophase I in meiosis.

119 Hard

119 of 168

Remembering +4 | -1

Find the correct feature of interkinesis during cell division.

View answer and explanation

Correct option: C

Duplication of centriole in animal cell

The correct answer is C (Duplication of centriole in animal cell) because interkinesis, the phase between meiosis I and meiosis II, involves centriole duplication in animal cells.

120 Medium

120 of 168

Understanding +4 | -1

Mature nerve cells are incapable of cell division. These cell are probably considered in

View answer and explanation

Correct option: D

{G_0}

-phase

The correct answer is D (

{G_0}

-phase) because mature nerve cells are incapable of cell division and are therefore in the

{G_0}

phase, a quiescent state outside the cell cycle.

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Cell-cycle & cell division practice · Mixed difficulty

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