NEET Biology Cell Cycle and Cell Division MCQs Set 09

Biology Objective Questions and Answers: Cell Cycle and Cell Division

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Multiple Choice Questions

Question 1: If karyokinesis is not followed by cytokinesis, then gives rise to
(a) Zygote
(b) Fertilised egg
(c) Multinucleate condition
(d) Embryo
Show Answer & Explanation

Answer: (c) Multinucleate condition

Explanation:
1. This is so because karyokinesis means division of nucleus and cytokinesis means division of cytoplasm, So, if nucleus divides and cytoplasm does not divide, then more than one nucleus will be there in a single cell i.e., multinucleate condition.

Question 2: A single cell containing large number of nuclei is called
(a) Syncytium
(b) Cell plate
(c) Monad
(d) Bivalent
Show Answer & Explanation

Answer: (a) Syncytium

Explanation:
1. Multinucleate cell Cell plate forms cell wall in plant cell.

Question 3: Agglutination of chromosomes is caused by a mitotic poison called
(a) Mustard gas
(b) Ribonuclease
(c) Azide
(d) Chalones
Show Answer & Explanation

Answer: (a) Mustard gas

Explanation:
1. Mustard gas causes clumping of chromosomes.

Question 4: In meiosis-I, condensation and coiling of chromatin fibres started during
(a) Metaphase
(b) Leptotene
(c) Diakinesis
(d) Diplotene
Show Answer & Explanation

Answer: (b) Leptotene

Explanation:
1. Leptotene which is the first stage of prophase I.

Question 5: Crossing over occurs during
(a) Anaphase I
(b) Leptotene
(c) Diplotene
(d) Pachytene
Show Answer & Explanation

Answer: (d) Pachytene

Explanation:
1. Prophase I of meiosis I shows exchange of genetic segments between non-sister chromatids of homologus chromosomes which results in recombination.

Question 6: _________ marks the site where crossing over had occurred.
(a) Diakinesis
(b) Synapsis
(c) Chiasmata
(d) Leptotene
Show Answer & Explanation

Answer: (c) Chiasmata

Explanation:
1. Chiasmata (x-shaped structure).

Question 7: Terminalisation of chiasmata occurs during
(a) Prophase-I
(b) Metaphase-I
(c) Anaphase-I
(d) Telophase-I
Show Answer & Explanation

Answer: (a) Prophase-I

Explanation:
1. In Diplotene stage terminalisation of chiasmata occurs.

Question 8: Bivalent chromosomes align themselves at the equator during
(a) Metaphase I
(b) Prophase I
(c) Metaphase II
(d) Anaphase II
Show Answer & Explanation

Answer: (a) Metaphase I

Explanation:
1. Pair of homologus chromosomes are termed as bivalents.

Question 9: If there are 30 chromosomes in G1 phase then what will be number of bivalents in zygotene stage?
(a) 30
(b) 15
(c) 45
(d) 60
Show Answer & Explanation

Answer: (b) 15

Explanation:
1. Number of bivalents i.e., no. of pair of chromosome in Zygotene = 15.

Question 10: What will be the amount of DNA in meiosis II products if meiocyte contains 30 pg DNA in G1 phase?
(a) 30 pg
(b) 60 pg
(c) 15 pg
(d) 120 pg
Show Answer & Explanation

Answer: (c) 15 pg

Explanation:
1. meiosis n n meiosis n n n n Meiocyte (2n, 2c) = 30 pg I 2c 2c II c c c c Therefore, 15 pg.

Question 11: Select an incorrect statement w.r.t. cell cycle
(a) Duplication of genes occurs twice in meiosis
(b) Karyokinesis occurs twice during meiotic division
(c) Cyclins are proteins that activate protein kinases to regulate the cell cycle
(d) After telophase-I, chromosome number is reduced to half.
Show Answer & Explanation

Answer: (a) Duplication of genes occurs twice in meiosis

Explanation:
1. Duplication of genes or chromosome occurs only once during S-phase of interphase.

Question 12: Maturation promoting factor formation triggers the cell to cross
(a) G1 → S
(b) S → G2
(c) G2 → M
(d) M → G1
Show Answer & Explanation

Answer: (c) G2 → M

Explanation:
1. It is formed by mitotic cyclin and cdc 2 kinase.

Question 13: Cyclin Dependent Kinases (CDKs)
(a) Act as mitotic poisons
(b) Cause disassembly of the microtubules
(c) Control various phases of cell cycle
(d) Arrest cell division due to non-formation of spindle
Show Answer & Explanation

Answer: (c) Control various phases of cell cycle

Explanation:
1. CDKs are responsible for controlling cell cycle.

Question 14: Which phase of interphase is the most important point in regulation of the cell cycle, during which it must decide whether the cell will start a new cycle or will enter in G0 phase?
(a) G1 phase
(b) S phase
(c) G2 phase
(d) Quiescent stage
Show Answer & Explanation

Answer: (a) G1 phase

Explanation:
1. During this phase if cell is signalled not to divide further then it enters quiescent stage where cell remains metabolically active but do not proliferate unless they are called to do so.

Question 15: Most organelles show duplication in cell cycle during
(a) G1-phase
(b) G0-phase
(c) S-phase
(d) G2-phase
Show Answer & Explanation

Answer: (a) G1-phase

Explanation:
1. Major cell organelles duplicate in G1 Phase.

Question 16: The two daughter cells formed during mitosis contains
(a) The same amount of DNA but a set of chromosomes different from those of parental cells
(b) The same amount of DNA and the same set of chromosomes as those of the parent cell
(c) Half the amount of DNA and the same set of chromosomes as those of the parent cell
(d) Double the amount of DNA and a set of chromosomes different from those of the parent cell
Show Answer & Explanation

Answer: (b) The same amount of DNA and the same set of chromosomes as those of the parent cell

Explanation:
1. This is so because mitosis is equational division occuring in somatic cells.

Question 17: Higher plants differ from animals in having
(a) Spindle microtubule
(b) Anastral mitosis
(c) Kinetochores
(d) Disappearance of nucleolus during prophase
Show Answer & Explanation

Answer: (b) Anastral mitosis

Explanation:
1. This is so because plant cell lack centriole and centrioles are responsible for formation of astral rays.

Question 18: Which of the following phases are longest and shortest in mitosis?
(a) Metaphase, Anaphase
(b) Prophase, Anaphase
(c) Telophase, Anaphase
(d) Prophase, Telophase
Show Answer & Explanation

Answer: (b) Prophase, Anaphase

Explanation:
1. Longest phase – Prophase Shortest phase – Anaphase.

Question 19: Spireme stage of chromosomes is associated with
(a) Early prophase
(b) Late prophase
(c) Metaphase
(d) Telophase
Show Answer & Explanation

Answer: (a) Early prophase

Explanation:
1. Early prophase when chromosome appear as fall of wool is known as spireme stage.

Question 20: Which one of the following is correct for mitosis in most of the plants member ?
(a) Amphiastral, anastral and eumitosis
(b) Anastral, acentric and premitosis
(c) Anastral, acentric and eumitosis
(d) Astral, centric and eumitosis
Show Answer & Explanation

Answer: (c) Anastral, acentric and eumitosis

Explanation:
1. Spindle apparatus without astral fibers and centrioles is called anastral and acentric.

Question 21: Spindle fibres are made up of
(a) Actin
(b) Myosin
(c) Alpha & beta tubulin
(d) Flagellin
Show Answer & Explanation

Answer: (c) Alpha & beta tubulin

Explanation:
1. Spindle fibres → Microtubules → Tubulin proteins.

Question 22: Cytokinesis in a plant cell is achieved by the formation of cell plate instead of a cleavage furrow, which is formed in
(a) Centripetal manner
(b) Centrifugal manner
(c) Both centripetal and centrifugal manner
(d) Equational manner
Show Answer & Explanation

Answer: (b) Centrifugal manner

Explanation:
1. This option, Centrifugal manner, is the one that agrees with the standard NCERT facts for this topic.

Question 23: Select an incorrect statement w.r.t. metaphase
(a) Spindle fibres are attached to small disc shaped structures at the surface of centromeres called kinetochores
(b) The plane of alignment of the homologous pair of chromosomes at metaphase is referred to as the metaphasic plate
(c) Chromosome appears to be made up of two sister chromatids
(d) The size of chromosomes can be studied in this phase
Show Answer & Explanation

Answer: (b) The plane of alignment of the homologous pair of chromosomes at metaphase is referred to as the metaphasic plate

Explanation:
1. Homologous pair of chromosome forms double metaphasic plate.

Question 24: All are the essential stages that take place during meiosis, except
(a) Two successive divisions without any DNA replication occuring between them
(b) Formation of chiasmata and crossing over
(c) Segregation of homologous chromosomes
(d) Number of chromosomes in daughter cells after meiosis II is reduced to half but the amount of DNA remains the same
Show Answer & Explanation

Answer: (d) Number of chromosomes in daughter cells after meiosis II is reduced to half but the amount of DNA remains the same

Explanation:
1. Amount of DNA is also reduced to half after meiosis II.

Question 25: In the meiotic cell division, 56 daughter cells are produced by two successive divisions in which
(a) First division is equational, second is reductional
(b) First division is reductional, and second is equational
(c) Both divisions are reductional
(d) Both divisions are equational
Show Answer & Explanation

Answer: (b) First division is reductional, and second is equational

Explanation:
1. First division is reductional i.e., Meiosis I and second is equational division i.e., Meiosis II.

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Cell Cycle and Cell Division Objective Questions & Solutions for NEET Biology

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