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NEET Biology MCQ
Neet Biology Cell Cycle, Cell Division Mcq
Quiz 14
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Q.1
In animal cell........
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a) constriction of cytoplasm begins from the peripheral region of the cell.
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b) middle lamella made up of pectin develops.
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c) constriction of cytoplasm begins from the centre of the cell.
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d) (a) and (b) both
Explanation
In animals, cell wall is absent. The outer layer of the cell is a thin plasma membrane. And so, in animal cell, constriction of cytoplasm begins from periphery of the cell to the centre of the cell(Centripetal order.) But plants have a cell wall as the outer layer, above the plasma membrane. As the cell wall is rigid, constriction of cytoplasm from periphery of the cell to the centre of the cell is not possible. And so, a cell plate is formed at the centre and it continues upto the periphery of the cell (Centrifugal order). Later the cell plate becomes the middle lamella. Explanation by S. Gokhulavasan Answer:(a)
Q.2
What is the average cell cycle span of a human cell ?
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a) 17 Hrs.
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b) 20 Hrs.
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c) 24 Hrs.
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d) 30 Hrs.
Explanation
Answer:(c)
Q.3
Meiosis involves :
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a) two nuclear division and one chromosome division
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b) one nuclear and two chromosomes division
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c) two each nuclear and chromosome division
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d) one each nuclear and chromosome division
Explanation
Answer:(b)
Q.4
Synapsis occurs between :
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a) spindle fibres and centromere
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b) a male and a female gamete
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c) m-RNA and ribosomes
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d) two homologous chromosomes
Explanation
Answer:(d)
Q.5
The sequence in the cell cycle is………
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a) S, G1, G2 M
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b) G1, S G2, M
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c) S, M G1, G2, M
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d) G2, S, M, G1
Explanation
Answer:(b)
Q.6
During which phase of prophase-I of meiosis does the process of synapsis occur ?
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a) Diplotene
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b) Leptotene
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c) Pachytene
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d) Zygotene
Explanation
Answer:(d)
Q.7
For the statement ‘X’ and statement ‘Y’ which of the following option is correct ? Statement – ‘X’ :During meiosis the genetic material is replicated once. Statement – ‘Y’ : Genetic material is not replicated during interkinesis.
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a) Both statements ‘X’ and ‘Y’ are correct
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b) ‘X’ is correct and ‘Y’ is wrong
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c) Both statements ‘X’ and ‘Y’ are wrong
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d) ‘X’ is wrong and ‘Y’ is correct
Explanation
Answer:(a)
Q.8
Match the following :
Coulmn-I
Coulmn-II
(A) Prophase-I
(i) Chromosomes move toward one plane along with centromere.
(B) Metaphase-II
(ii) Half the number of chromosomes in seen
(C) Anaphase-I
(iii) Longest phase of meiosis-I
(D) Telophase-I
(iv) Two nuclei are seen
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a) (A - iii) (B - i) (C - ii) (D - iv)
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b) (A - i) (B - ii) (C - iii) (D - iv)
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c) (A - ii) (B - iii) (C - iv) (D - i)
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d) (A - iv) (B - i) (C - i) (D - iii)
Explanation
Answer:(a)
Q.9
Complete disintegration of nuclear membrane and nucleolus take place during which stage of mitosis ?
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a) Prophase
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b) Metaphase
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c) Anaphase
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d) Telophase
Explanation
Answer:(a)
Q.10
In diploid living organisms crossing over is responsible for ?
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a) No Segregation of genes
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b) Linkage between genes
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c) Recombination of linked genes
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d) Dominancy of genes
Explanation
Answer:(b)
Q.11
The result of meiosis is the formation of....... Explanation provided please click on
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a) 2 cells
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b) 6 cells
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c) 8 cells
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d) 4 cells
Explanation
Meiosis is a reductional division in which the chromosome number is halved from n to 2n , so at the end of meiosis there are 4 haploid(n) cells formed. It occurs in two steps Meiosis 1 and Meiosis 2. M-1 is the division which includes crossing over of homologous chromosomes , while M-2 is just the same as mitosis. Answer:(d)
Q.12
Cytokinesis is generally, but not always, seen in mitosis. If cells undergo mitosis and do not follow cytokinesis then it would result in :
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a) Cells with abnormal small nuclei
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b) Ensuring genetic homogeneity of cell
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c) A cell with a single large nucleus
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d) A cell with two or more nuclei
Explanation
Answer:(d)
Q.13
During meiosis centromere divides :
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a) Only once at anaphase – I
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b) Twice in meiosis – I & II
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c) Only one at anaphase - II
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d) Twice in each cell at the end of anaphase – I & II
Explanation
Anaphase-II is a very important stage of cell division. It ensures that duplicated chromosomes, or sister chromatids, separate into two equal sets. If chromosomes fail to separate properly during anaphase, nondisjunction has occurred. It results in cells with abnormal numbers of chromosomes. Answer:(c)
Q.14
Which structure can be observed at the surface of centromere during metaphase ?
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a) Kinetochores
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b) Chromatophore
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c) Kinetophore
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d) Chromatophore
Explanation
Answer:(a)
Q.15
A. G1 phase is also called growth phase. R. There is a lot of biosynthetic activity during
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a) Both A and R are true and R is correct explanation of A.
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b) Both A and R are true and R is not correct explanation of A
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c) A is true and R is wrong
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d) A is wrong and R is true
Explanation
Answer:(a)
Q.16
How does the pairs of homologous chromosomes appear during zygotene phase ?
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a) Tetravalent
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b) Bivalent
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c) Trivalent
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d) Univalent
Explanation
Answer:(b)
Q.17
Crossing over occurs between.......
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a) Non – homologous chromatids of non homologous chromosomes
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b) Non – sister chromatids of homologous chromosomes
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c) Sister chromatids of homologous chromosomes
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d) Sister chromatids of non homologous chromosome
Explanation
Answer:(b)
Q.18
Which of the following statement is true for prophase ?
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a) At the end of this phase nuclear membrane is formed
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b) Centriole divides and arranged on opposite pole.
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c) At the end of this phase chromosomes disappear.
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d) In this phase condensation of chromosome takes place along their lengths.
Explanation
Answer:(d)
Q.19
The period between two successive divisions is called......
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a) G1 phase
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b) Cell division
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c) Cellcycle
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d) Interphase
Explanation
The period between two successive cell divisions is called Interphase or the resting phase Answer:(c)
Q.20
Which of the following structure will not be common to mitotic cell of a higher plant ?
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a) Centriole
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b) Cell plate
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c) Centromere
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d) Spindle fibre
Explanation
Answer:(a)
Q.21
Pairing of homologous chromosomes during zygotene is termed :
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a) Synapse
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b) crossing over
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c) synapsis
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d) Terminalisation
Explanation
In zygotene stage, chromosomes start pairing together and this process of association is called synapsis. Such paired chromosomes are called homologous chromosomes Answer:(c)
Q.22
Number of chromosomes are maintained from generation to generation by :
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a) Metamorphosis
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b) Mitotic division
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c) Division
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d) Meiosis division
Explanation
Answer:(d)
Q.23
The stage of mitosis during which the nucleolus disintegrates and chromosomes appear is known as
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a) Prophase
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b) Interphase
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c) Anaphase
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d) Metaphase
Explanation
Answer:(a)
Q.24
The number of meiotic divisions required to produce 400 seeds in a pea plant is..... Explanation is provided please clikc on
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a) 700
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b) 200
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c) 500
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d) 400
Explanation
During sexual reproduction in angiosperms, meiosis occurs in microspore and megaspore mother cells. For the formation of 400 seeds in the pea plant, we require 400 male and 400 female gametes. In one meiotic division, one microspore mother cell in the anther forms 4 microspores, each of which develops as a pollen grain. For the production of 400 male gametes, the number of meiotic division is 400/4= 100. In one meiotic division, one megaspore mother cell produces one female gamete . For the production of 400 female gametes, the number of meiotic division is 400. So, the total number of meiotic divisions are 100+400=500. Answer:(c)
Q.25
What is shown by given diagram and what is indicatd as ‘A’ in it ?
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a) Early prophase; A = Cleavage furrow
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b) Interphase (G2); A = Centrosomes
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c) Late prophase; A = Kinetochore
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d) Interphase (G1); A = Centrosomes
Explanation
Answer:(b)
Q.26
In which of the following stages chromosomes are not seen clearly ?
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a) Diplotene
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b) Prophase-II
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c) Metaphase-III
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d) Leptotene
Explanation
Answer:(b)
Q.27
What is average cell cycle span of a Yeast cell ?
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a) 70 min.
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b) 85 min.
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c) 90 min.
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d) 120 min.
Explanation
Answer:(c)
Q.28
The two chromatids of a metaphase chromosome represents :
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a) replicated chromosomes to be separated at anaphase
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b) maternal and paternal chromosomes joined at the centromere
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c) homologous chromosome of a diploid set
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d) non-homologous joined at the centromere
Explanation
Answer:(a)
Q.29
At which stage of mitosis chromatids separate and passes to different poles :
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a) Telophase
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b) Anaphase
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c) Prophase
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d) Metaphase
Explanation
Answer:(b)
Q.30
Statement – P : G1 stage is the last stage or interphase. Statement – Q : Systhesis of DNA takes place in G2 stage.
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a) Statement P and Q both are correct
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b) Statement P is correct statement Q is wrong
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c) Statement P is wrong and statement Q is correct
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d) Statement P and Q both are wrong
Explanation
Answer:(d)
0 h : 0 m : 1 s
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