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3920+ Biology Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: All India Pre Medical Test (AIPMT) .

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Chapter: Cell Cycle and Cell divisons
851.

A. During interphase, chromosomes are recognized as chromatin network. R. Chromosomes are highly dispersed during this phase.

A. Both A and R are true and R is correct explanation of A.
B. Both A and R are true and R is not correct explanation of A
C. A is true and R is wrong
D. I is wrong and R is true
Answer» A. Both A and R are true and R is correct explanation of A.
discuss
852.

A. G1 phase is also called growth phase. R. There is a lot of biosynthetic activity during

A. Both A and R are true and R is correct explanation of A.
B. Both A and R are true and R is not correct explanation of A
C. A is true and R is wrong
D. A is wrong and R is true
Answer» A. Both A and R are true and R is correct explanation of A.
discuss
853.

A. The meiotic division-I is also called reduction division. R. During this the chromosomes are distributed in two cells in half their number.

A. Both A and R are true and R is correct explanation of A.
B. Both A and R are true and R is not correct explanation of A
C. A is true and R is wrong
D. A is wrong and R is true
Answer» A. Both A and R are true and R is correct explanation of A.
discuss
854.

A. During meiosis, the genetic material is replicated twice whereas the cell divides one. R. Meiosis takes place in plants and animals during the formation of reproductive cells.

A. Both A and R are true and R is correct explanation of A.
B. Both A and R are true and R is not correct explanation of A
C. A is true and R is wrong
D. A is wrong and R is true
Answer» D. A is wrong and R is true
discuss
855.

A. Number of chiasmata is more in longer chromosomes. R. The number of chiasmata depends on the length of chromosomes.

A. Both A and R are true and R is correct explanation of A.
B. Both A and R are true and R is not correct explanation of A
C. A is true and R is wrong
D. A is wrong and R is true
Answer» A. Both A and R are true and R is correct explanation of A.
discuss
856.

Statement – P : G1 stage is the last stage or interphase. Statement – Q : Systhesis of DNA takes place in G2 stage.

A. Statement P and Q both are correct
B. Statement P is correct statement Q is wrong
C. Statement P is wrong and statement Q is correct
D. Statement P and Q both are wrong
Answer» D. Statement P and Q both are wrong
discuss
857.

Statement – P : Interphase is divided in three sub phases. Statement – Q : G1 phase is the initial phase of interphase.

A. Statement P and Q both are correct
B. Statement P is correct statement Q is wrong
C. Statement P is wrong and statement Q is correct
D. Statement P and Q both are wrong
Answer» A. Statement P and Q both are correct
discuss
858.

Statement – P : In ‘S’ stage centrosome is duplicated Statement – Q : In the prophase centrioles separate from each other and move towards the opposite poles.

A. Statement P and Q both are correct
B. Statement P is correct statement Q is wrong
C. Statement P is wrong and statement Q is correct
D. Statement P and Q both are wrong
Answer» C. Statement P is wrong and statement Q is correct
discuss
859.

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.

A. Both statements ‘X’ and ‘Y’ are correct
B. ‘X’ is correct and ‘Y’ is wrong
C. Both statements ‘X’ and ‘Y’ are wrong
D. ‘X’ is wrong and ‘Y’ is correct
Answer» A. Both statements ‘X’ and ‘Y’ are correct
discuss
860.

Match the following :
Coulmn-I Coulmn-II
(A) Prophase (i) Nuclear membrane and other orgenelles reorganise
(B) Metaphase (ii) Arrangement of chromatids on the poles
(C) Anaphase (iii) Formation of cytoplasmic fibres of proteins
(D) Telophase (iv) Arranged on equatorial plane
(E) Cytokinesis (v) The formation of syncytium

A. (A - i) (B - ii) (C - iii) (D - iv) (E - v)
B. (A - iii) (B - iv) (C - ii) (D - i) (E - v)
C. (A - v) (B - iv) (C - iii) (D - ii) (E - i)
D. (A - ii) (B - iii) (C - iv) (D - v) (E - i)
Answer» B. (A - iii) (B - iv) (C - ii) (D - i) (E - v)
discuss
861.

Match the following :
Coulmn-I Coulmn-II
(A) Laptotene (i) Nucleolus disappears
(B) Zygotence (ii) Appearance of recombination nodules
(C) Pachytene (iii) Develoment of Synapsis
(D) Diplotene (iv) Chromosome appears filamentous
(E) Daikinesis (v) Genes exchange at chaismata

A. (A - iv) (B - iii) (C - ii) (D - v) (E - i)
B. (A - i) (B - ii) (C - iii) (D - iv) (E - v)
C. (A - v) (B - iv) (C - iii) (D - ii) (E - i)
D. (A - ii) (B - iii) (C - iv) (D - r) (E - i)
Answer» A. (A - iv) (B - iii) (C - ii) (D - v) (E - i)
discuss
862.

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

A. (A - iii) (B - i) (C - ii) (D - iv)
B. (A - i) (B - ii) (C - iii) (D - iv)
C. (A - ii) (B - iii) (C - iv) (D - i)
D. (A - iv) (B - i) (C - i) (D - iii)
Answer» A. (A - iii) (B - i) (C - ii) (D - iv)
discuss
863.

Match the following :
Coulmn-I Coulmn-II
(A) Cytokinesis (i) Reformation of nuclear Membrane and golgi body
(B) Metaphase (ii) Synthesis of RNA and protein
(C) Telophase (iii) Centromers of chmosomes are arranged on equatorial plate.
(D) Interphase (iv) Contraction of chomosomes starts (v) The formation of synctium

A. (A - i) (B - ii) (C - iii) (D - iv)
B. (A - iv) (B - iii) (C - i) (D - ii)
C. (A - iv) (B - ii) (C - i) (D - iv)
D. (A - iv) (B - iii) (C - ii) (D - i)
Answer» C. (A - iv) (B - ii) (C - i) (D - iv)
discuss
864.

Select correct statement’s for cell cycle.
(i) Yeast cell can complete on cell cycle in every 90 minutes
(ii) A period between creation of a cell and division of that cell.
(iii) Cell cycle is mainly divided into interphase and differentiation like two phases.

A. (i) and (ii) only
B. (i) and (iii) only
C. (ii) and (iii) only
D. (i), (ii) and (iii)
Answer» A. (i) and (ii) only
discuss
865.

Which of the following statement is/are correct for prophase of mitosis ?
(i) At the end of this phase nuclear membrane and nucleolus disintegrate.
(ii) At the end of this phase two chromosome and a centromere holding them together.
(iii) This phase begins with the condensation of chromatids along their lengths.

A. (i) only
B. only (i) and (ii)
C. only (ii) and (iii)
D. (i) and (iii)
Answer» A. (i) only
discuss
866.

Which of the following statement is/are correct for Prophase-I ?
(i) During diplotene, the members of each pair of homologous chromosomes start moving away from one another.
(ii) In zygotene, bivalent chromosomes appear tetravalent.
(iii) In diakinesis, chromatids become separated even at the site of chiasmata.

A. only (i)
B. only (ii)
C. only (i) and (iii)
D. (i), (ii) and (iii)
Answer» C. only (i) and (iii)
discuss
867.

Which of the following statement is/are correct for Meiosis-II ?
(i) Chromosomes are arranged on equatorial plate in prophase-II
(ii) Nucleolus disappear during telophase-II
(iii) In anaphase-II, the chromatids with their independent centromeres are called chromosomes.
(iv) In metaphase-II, centromere of each chromosome becomes attached to filament of bipolar spindle.

A. only (i) and (ii)
B. only (iii) and (iv)
C. only (i), (ii) and (iii)
D. (i), (ii) and (iii)
Answer» B. only (iii) and (iv)
discuss
868.

Find out the incorrect pair.

A. Telophase – Chromatin is observed
B. G1 phase – New DNA is synthesized
C. Prophase – nuclear membrane disintegrates
D. Zygotene - Synapsis
Answer» B. G1 phase – New DNA is synthesized
discuss
869.

Find the incorrect pair.

A. Bipolar spindle – Cytoplasmic fibres of protein
B. Prophase – Chromosome made up of two chromatids and centromere
C. Anaphase – Equatorial plate
D. Metaphase - Kinetochore
Answer» C. Anaphase – Equatorial plate
discuss
870.

From the following which pair does not match ?

A. S – state – Synthesis of DNA
B. Meiosis – One parental cell produces two daughter cells
C. Anaphase – Each chomatid with independent centromere.
D. Zygotene - Synapsis
Answer» B. Meiosis – One parental cell produces two daughter cells
discuss
871.

“The number of chiasmata depends on chromosomes” – What is the mistake in the given statement ?

A. Width of chromosome – Word in not mentioned
B. Size of chromosome – Word is not mentioned
C. Number of chromosome – Word is not mentioned
D. Length of chromosome – Word is not mentioned
Answer» D. Length of chromosome – Word is not mentioned
discuss
872.

Which is the true statement for mitosis ?

A. Cell formed by it performs diverse functions i.e. show division of labour
B. The number of chromosomes in the new cells are half than that of the parent cell.
C. Two cells are formed as a result of this division are identical in all aspects.
D. Cells formed as a result of mitosis have different genetic characters.
Answer» C. Two cells are formed as a result of this division are identical in all aspects.
discuss
873.

Which of the following statement is true for mitosis ?

A. Cytokinesis and karyokinesis occur together
B. Cytokinesis and karyokinesis are random
C. Cytokinesis preceedes karyokinesis
D. Karyokinesis preceedes cytokinesis
Answer» D. Karyokinesis preceedes cytokinesis
discuss
874.

Indentify the correct sequence of karyokinesis stages :

A. Prophase, Anaphase, Metaphase, Telophase
B. Prophase, Metaphase, Anaphase, Telophase
C. Prophase, Telophase, Metaphase, Anaphase
D. Prophase, Metaphase, Telophase, Anaphase
Answer» B. Prophase, Metaphase, Anaphase, Telophase
discuss
875.

When synapsis is completed all along the chromosome, the cell is said to have entered a stage called :

A. zygotene
B. pachytene
C. diplotene
D. diakinesis
Answer» B. pachytene
discuss
876.

Which process is indicated by given diagram ?

A. Cell division during formation of reproductive cells.
B. Cell division in somatic cells.
C. (a) and (b) both
D. Amitosis
Answer» A. Cell division during formation of reproductive cells.
discuss
877.

Which of the following cell can complete one cell cycle in 90 minutes ?

A. Plant cell
B. Animal Cell
C. Angal cel
D. Yeast Cell
Answer» D. Yeast Cell
discuss
878.

Which plant material is best suited for studying mitosis in class room ?

A. Root tip
B. Anther
C. Pieces of bark
D. Shoot apex
Answer» A. Root tip
discuss
879.

Mitosis can occur in

A. Haploid and diploid cells both
B. Pollen mother cells
C. Haploid cell only
D. Diploid cell only
Answer» A. Haploid and diploid cells both
discuss
880.

Genetic homogeneity and exact similarity between chromosomes of various cell within the same type of issue of plant is due to :

A. Cytokinesi
B. Meiosis
C. Mitosis
D. Fertilization
Answer» C. Mitosis
discuss
881.

Spindle fibres are composed of :

A. Lipid
B. Pectins
C. Proteins
D. Cellulose
Answer» C. Proteins
discuss
882.

In the plant cell, cytokinesis occurs by

A. Separation of the cytoplasm from the periphery to central region.
B. Separation of the cytoplasm throughout the equatorial plane simultaneously
C. Separation of the cytoplasm from cell centre to its periphery
D. Following of cytoplasm from two side at right angles to the plane of spindle pole
Answer» C. Separation of the cytoplasm from cell centre to its periphery
discuss
883.

Cytokinesis is generally, but not always, seen in mitosis. If cells undergo mitosis and do not follow cytokinesis then it would result in :

A. Cells with abnormal small nuclei
B. Ensuring genetic homogeneity of cell
C. A cell with a single large nucleus
D. A cell with two or more nuclei
Answer» D. A cell with two or more nuclei
discuss
884.

How many time is the genetic material replicated during meiosis ?

A. Twice
B. Once
C. Four times
D. None of the above
Answer» B. Once
discuss
885.

How does the pairs of homologous chromosomes appear during zygotene phase ?

A. Univalent
B. Trivalent
C. Tetravalent
D. Bivalent
Answer» D. Bivalent
discuss
886.

In which of the following stages chromosomes are not seen clearly ?

A. Leptotene
B. Prophase-II
C. Diplotene
D. Metaphase-III
Answer» B. Prophase-II
discuss
887.

Crossing over involves.......

A. Duplication of chromosome
B. Deletion of chromosomes
C. Exchange of genetic matetial
D. Addition of chromosome
Answer» C. Exchange of genetic matetial
discuss
888.

Crossing over occurs between.......

A. Non – homologous chromatids of non homologous chromosomes
B. Non – sister chromatids of homologous chromosomes
C. Sister chromatids of homologous chromosomes
D. Sister chromatids of non homologous chromosome
Answer» B. Non – sister chromatids of homologous chromosomes
discuss
889.

During meiosis centromere divides :

A. Only one at anaphase - II
B. Only once at anaphase – I
C. Twice in meiosis – I & II
D. Twice in each cell at the end of anaphase – I & II
Answer» A. Only one at anaphase - II
discuss
890.

Which of the following occurs only during meiosis ?

A. Pairing of homologous chromosome
B. Separation of duplicated stands
C. Cytokinesis
D. Disappearance of nucleolus
Answer» A. Pairing of homologous chromosome
discuss
891.

Select the correct option from Column-I and Column-II.
Column-I Column-II
(A) Leptotene (p) Synapsis
(B) Zygotene (q) Formation of bipolar spindle
(C) Pachytene (r) Condensation of chromosomes
(D) Diakinesis (s) Crossing over

A. (A - s) (B - s) (C - p) (D - q)
B. (A - r) (B - r) (C - s) (D - p)
C. (A - r) (B - r) (C - s) (D - q)
D. (A - q) (B - q) (C - s) (D - r)
Answer» C. (A - r) (B - r) (C - s) (D - q)
discuss
892.

Select the correct option from Column-I and Column-II.
Column-I Column-II
(A) G1 phase (p) Synthesis of new DNA
(B) G2 phase (q) Synthesis of DNA does not occur
(C) S phase (r) DNA synthesis stops

A. (A - r) (B - p) (C - q)
B. (A - p) (B - r) (C - q)
C. (A - r) (B - q) (C - p)
D. (A - q) (B - r) (C - p)
Answer» D. (A - q) (B - r) (C - p)
discuss
893.

Due to crossing over, an opportunity for the exchange of genes becomes possible.

A. S - phase
B. Cell Cycle
C. Significance of meiosis
D. G2 phase
Answer» C. Significance of meiosis
discuss
894.

Which of the following statement is true for prophase ?

A. At the end of this phase chromosomes disappear.
B. In this phase condensation of chromosome takes place along their lengths.
C. At the end of this phase nuclear membrane is formed
D. Centriole divides and arranged on opposite pole.
Answer» B. In this phase condensation of chromosome takes place along their lengths.
discuss
895.

Syncytium means........

A. small disc shaped structures at the surface of the centromeres.
B. a condition arises when karyokinesis is not followed by cytokinesis.
C. process of constriction of cytoplasm from peripheral region of cell that extends towards the centre.
D. a multinucleate condition arises when karyokinesis and cytokinesis is over.
Answer» B. a condition arises when karyokinesis is not followed by cytokinesis.
discuss
896.

In animal cell........

A. constriction of cytoplasm begins from the peripheral region of the cell.
B. middle lamella made up of pectin develops.
C. constriction of cytoplasm begins from the centre of the cell.
D. (a) and (b) both
Answer» C. constriction of cytoplasm begins from the centre of the cell.
discuss
897.

Given below is a schematic break-up of the phases/stage of cell cycle :

A. C Karyokinesis
B. D Synthetic phase
C. A Cytokinesis Metaphase
D. B Metaphase
Answer» B. D Synthetic phase
discuss
898.

Spindle fibre shorten.

A. Prophase
B. Telophase
C. Metaphase
D. Anaphase
Answer» D. Anaphase
discuss
899.

Nucleus is reformed

A. Telophase-I
B. Prophase-II
C. Anaphase-II
D. Metaphase-II
Answer» A. Telophase-I
discuss
900.

Pair of homologous chromosomes become arranged at the equatorial plane of the cell.

A. Metaphase-II
B. Metaphae-I
C. Metaphase
D. Zygotene
Answer» B. Metaphae-I
discuss

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