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NEET • BIOLOGY • CELL-CYCLE & CELL DIVISION
Cell-cycle & cell division practice · Mixed difficulty
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Showing 151-168 of 168 questions
151
Medium
151 of 168
Understanding
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The number of chromosomes becomes half in
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Correct option: A
Anaphase-I
Option A (Anaphase-I) is correct because it is during Anaphase-I of meiosis that homologous chromosomes separate, reducing the chromosome number to half.
152
Medium
152 of 168
Understanding
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Which of the following statements are correct for cell cycle?
I. Cell cycle is the sequence of events involving growth and division of a cell from the time of its formation to its own division into daughter cells
II. Cell growth (in terms of cytoplasmic increase) is a continuous process
III. DNA synthesis occurs only during one specific stage in the cell cycle
IV. The replicated chromosomes (DNA) are distributed to daughter nuclei during cell division
I. Cell cycle is the sequence of events involving growth and division of a cell from the time of its formation to its own division into daughter cells
II. Cell growth (in terms of cytoplasmic increase) is a continuous process
III. DNA synthesis occurs only during one specific stage in the cell cycle
IV. The replicated chromosomes (DNA) are distributed to daughter nuclei during cell division
View answer and explanation
Correct option: D
I, II, III and IV
Option D (I, II, III and IV) is correct because all the statements accurately describe the events and processes of the cell cycle.
153
Medium
153 of 168
Application
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If the egg of sexually reproducing organisms contains 16 chromosomes, what will be the number of dyads in anaphase I?
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Correct option: C
32
Option A (16) is incorrect. If the egg has 16 chromosomes, the diploid number is 32 (2n=32). After meiosis I, each cell has 16 chromosomes, each consisting of two chromatids (dyad). Therefore, the number of dyads in anaphase I is 16.
154
Medium
154 of 168
Understanding
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Programmed cell death (apoptosis):
View answer and explanation
Correct option: C
is a natural process during development.
Option C (is a natural process during development) is correct because apoptosis is a programmed cell death essential for normal development and tissue homeostasis.
155
Medium
155 of 168
Application
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How many chromosomes shall be present in a Diploid cell at mitotic anaphase if its antipodal cell has 10 chromosomes?
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Correct option: B
40
Option B (40) is correct because antipodal cells are haploid (n), so n=10. A diploid cell has 2n chromosomes, so 2n=20. At mitotic anaphase, the number of chromosomes doubles temporarily due to the separation of sister chromatids, resulting in 40 chromosomes.
156
Medium
156 of 168
Analyzing
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Assertion (A) Cell normally proceed to mitosis without
interruption, once it enters the -phase.
Reason (R) Replicated chromosomes (DNA) are distributed
to daughter nuclei by a complex series of events under
genetic control
interruption, once it enters the -phase.
Reason (R) Replicated chromosomes (DNA) are distributed
to daughter nuclei by a complex series of events under
genetic control
View answer and explanation
Correct option: D
If A is false, but R is true
Option D (If A is false, but R is true) is correct because cells do not always proceed to mitosis without interruption after G2 phase, and the distribution of replicated chromosomes is indeed under genetic control.
157
Medium
157 of 168
Remembering
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During the -phase of cell division
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Correct option: A
RNA and proteins are synthesized
Option A (RNA and proteins are synthesized) is correct because during the G1 phase, the cell grows and synthesizes RNA and proteins necessary for cell growth and function.
158
Easy
158 of 168
Remembering
+4 | -1
In which of the following stage of the cell cycle, the attachment of spindle fibres to kinetochores of chromosomes occurs?
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Correct option: B
Metaphase
Option B (Metaphase) is correct because spindle fibers attach to kinetochores during metaphase.
159
Medium
159 of 168
Understanding
+4 | -1
Select the correct statements regarding S-phase of interphase
I. Occurs between and
II. DNA replication begins in the nucleus
III. Centrioles duplicate in the cytoplasm
IV. As DNA is doubled, number of chromosomes also doubles
The option with correct statements is
I. Occurs between and
II. DNA replication begins in the nucleus
III. Centrioles duplicate in the cytoplasm
IV. As DNA is doubled, number of chromosomes also doubles
The option with correct statements is
View answer and explanation
Correct option: D
I, II and III
The correct answer is D (I, II and III) because statements I, II, and III accurately describe the S-phase of interphase.
160
Hard
160 of 168
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.
161
Hard
161 of 168
Understanding
+4 | -1
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.
162
Hard
162 of 168
Analyzing
+4 | -1
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).
163
Medium
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Understanding
+4 | -1
During which phase(s) of cell cycle, amount of DNA and number of chromosomes respectively in a cell remain at 8C level & 4n if the initial amount of DNA and number of chromosomes are denoted as 4C & 4n, respectively?
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Correct option: D
only
Option D ( only) is correct because after S phase, DNA content doubles (8C) and remains so until mitosis, while chromosome number (4n) remains constant until anaphase.
164
Medium
164 of 168
Understanding
+4 | -1
Which of the following stage of meiosis is responsible for deciding genetic constitution of gametes?
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Correct option: D
Anaphase-I
Option D (Anaphase-I) is correct because during Anaphase-I, homologous chromosomes separate, which determines the genetic constitution of the gametes.
165
Medium
165 of 168
Analyzing
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Assertion: Variations are critical for the process
of evolution.
Reason : Meiosis increases the genetic
variability in the population of organisms from
one generation to the next.
of evolution.
Reason : Meiosis increases the genetic
variability in the population of organisms from
one generation to the next.
View answer and explanation
Correct option: B
If both Assertion and Reason are true but Reason
is not the correct explanation of Assertion
is not the correct explanation of Assertion
Option B (If both Assertion and Reason are true but Reason is not the correct explanation of Assertion) is correct because both variations being critical for evolution and meiosis increasing genetic variability are true statements, but the latter doesn't directly explain the former.
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166
Medium
166 of 168
Remembering
+4 | -1
Spindle fibre is made up of
View answer and explanation
Correct option: D
Tubulin
Option D (Tubulin) is correct because spindle fibers are made of microtubules, which are polymers of tubulin.
167
Medium
167 of 168
Remembering
+4 | -1
The process of cytokinesis refers to the division of
View answer and explanation
Correct option: C
Cytoplasm
Option C (Cytoplasm) is correct because cytokinesis, by definition, is the process of dividing the cytoplasm of a cell.
168
Medium
168 of 168
Analyzing
+4 | -1
Assertion (A): Meiosis-I is most significant phenomenon from evolution point of view.
Reason (R): Meiosis-I leads to reduction in chromosome so that consistency of chromosome can be maintained.
Reason (R): Meiosis-I leads to reduction in chromosome so that consistency of chromosome can be maintained.
View answer and explanation
Correct option: B
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
Option B (Both (A) & (R) are true but the (R) is not the correct explanation of the (A)) is correct because while both statements are true, the reduction in chromosome number is not the *reason* why meiosis I is significant from an evolutionary point of view. The significance lies in the genetic variation it generates.
Revision notes and key takeaways
Review CELL-CYCLE & CELL DIVISION in your textbook or class notes, then use this set to check your understanding.
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