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NEET • BIOLOGY • CELL-CYCLE & CELL DIVISION
Cell-cycle & cell division practice · Hard
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31
Hard
31 of 43
Remembering
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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).
32
Hard
32 of 43
Remembering
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Find the correct feature of interkinesis during cell division.
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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.
33
Hard
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Application
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A zoologist examined an intestine cell from a crayfish and counted 200 chromosomes, each consisting of 2 chromatids, at prophase I of mitosis. What would he expect to see in each of the four cells at telophase II of meiosis if he looked in the crayfish ovary?
View answer and explanation
Correct option: D
100 chromosomes, each consisting of 1 chromatid
Option D (100 chromosomes, each consisting of 1 chromatid) is correct because after meiosis II, the sister chromatids have separated, resulting in half the number of chromosomes as the original cell, each with a single chromatid.
34
Hard
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Application
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You are given 13-Meiotic divisions, from these divisions how many seeds you can form? How many pollen grains will be wasted?
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Correct option: D
No. of seeds – 10; No. of wasted P.G – 2
Option D (No. of seeds – 10; No. of wasted P.G – 2) is correct because 13 meiotic divisions produce 52 pollen grains, and since each seed needs 4 pollen grains, 13 seeds can be formed, with 2 pollen grains wasted.
35
Hard
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Application
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If a gamete in pollen tube has of then what amount of would have been there in its pollen mother cell at phase?
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Correct option: B
Option B () is correct because the amount of DNA in the pollen mother cell at the G2 phase is four times the amount in the gamete.
36
Hard
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Understanding
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Which disturb the nucleocytoplasmic ratio
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Correct option: D
Cell elongation
Option D (Cell elongation) is correct because cell elongation increases the cytoplasmic volume without a proportional increase in nuclear volume, thus disturbing the nucleocytoplasmic ratio.
37
Hard
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Understanding
+4 | -1
Meiocyte could be
View answer and explanation
Correct option: D
All
Option D (All) is correct because a meiocyte can be a zygote, spore mother cell, or gametic mother cell, as all these cells undergo meiosis.
38
Hard
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Understanding
+4 | -1
Genetic recombination occurs due to fertilization and meiosis crossing over.
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Correct option: A
Fertilization and meiosis
Option A (Fertilization and meiosis) is correct because genetic recombination occurs through crossing over during meiosis and the fusion of gametes during fertilization.
39
Hard
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Understanding
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What is the correct sequence of the steps given here?
Also work out the process depicted in the steps?
I. Homologous chromosomes move toward opposite poles of the cell; chromatids do not separate.
II. Chromosomes gather together at the two poles of the cell and the nuclear membrances reform.
III. Homologous chromosomes pair and exchanges segments.
IV. Homologous chromosomes align on a central plate.
V. The haploid cells separate completely.
Also work out the process depicted in the steps?
I. Homologous chromosomes move toward opposite poles of the cell; chromatids do not separate.
II. Chromosomes gather together at the two poles of the cell and the nuclear membrances reform.
III. Homologous chromosomes pair and exchanges segments.
IV. Homologous chromosomes align on a central plate.
V. The haploid cells separate completely.
View answer and explanation
Correct option: A
The correct sequence is III→IV→I→II→V and the process is meiosis-I
Option A (The correct sequence is III→IV→I→II→V and the process is meiosis-I) is correct because it accurately describes the sequence of events in meiosis I.
40
Hard
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Understanding
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Which one of the following never occurs during mitotic cell division?
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Correct option: D
Pairing of homologous chromosomes
Option D (Pairing of homologous chromosomes) is correct because pairing of homologous chromosomes occurs during meiosis, not mitosis.
41
Hard
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Remembering
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Compaction of chromosomes is seen during
View answer and explanation
Correct option: A
Leptotene
Option A (Leptotene) is correct because the compaction of chromosomes, which is the process of chromosomes becoming shorter and thicker, is first observed during the leptotene stage of prophase I in meiosis.
42
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Understanding
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Which of the following occurs more than one and less than five in a chromosome?
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Correct option: D
Telomere
Option D (Telomere) is correct because telomeres are present at the ends of each chromosome and can shorten with each cell division, thus existing in numbers greater than one but less than five per chromosome.
43
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Analyzing
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Assertion (A): A meiotic mother cell is always diploid.
Reason (R): In meiosis, there is no pairing of homologous chromosomes.
Reason (R): In meiosis, there is no pairing of homologous chromosomes.
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 a meiotic mother cell is always diploid, but meiosis *does* involve pairing of homologous chromosomes (synapsis).
Revision notes and key takeaways
Review CELL-CYCLE & CELL DIVISION in your textbook or class notes, then use this set to check your understanding.
Showing 31-43 of 43 questions