Class 11 VBQs Biology Cell Cycle and Cell Division

Question. In prophase centrosome which had undergone duplication during interphase, begins to move towards :
(a) Same poles of the cell
(b) Opposite poles of the cell
(c) One towards centre while another towards pole
(d) Both towards centre

Question. DNA replication is found in :-
(a) Mitosis and meiosis-I
(b) Mitosis and meiosis-I and meiosis-II
(c) Meiosis only
(d) Mitosis only

Question. G0 (Quiscent) stage is :
(a) Part of interphase
(b) Part of M-phase
(c) Part of G2 phase
(d) Not a part of cell cycle

Question. Thick-thread stage occured in :-
(a) Leptotene
(b) Zygotene
(c) Pachytene
(d) Diplotene

Question. The significance of Meiosis is that it –
(a) Produce four cells having chromosomal number equal to mother cell
(b) Occurs in all types of cells
(c) Maintains the constant Chromosomes number to a particular species
(d) Growth of animal body ograns

Question. Which one of the following is most correct statement :-
(a) Chromatin material tends to collect in a mass in the two poles
(b) Each set of chromatin material tends to collect at each of the two poles
(c) Each set of chromatin material tends to collect at metaphasic plate
(d) Chromatin material tends to collect in a mas at one pole

Question. Nuclear envelop develops around the chromosome clusters at :
(a) One pole
(b) Centre
(c) Each pole
(d) Pole as well as centre both

Question. Crossing over that results in genetic recombination in higher organisms occurs between –
(a) Non-sister chromatids of a bivalent
(b) Two daughter nuclei
(c) Two different bivalents
(d) Sister chromatids of a bivalents

Question. At anaphase-II, sister chromatids move towards opposite poles of the cell by :
(a) Contraction in spindle fibre attached to kinetochores
(b) Shortening of microtubules attached to kinetochores
(c) Lengthening of microtubules attached to kinetochores
(d) Relaxation in spindle fibre attached to kinetochores

Question. In a slow dividing normal cell :
(a) G1 phase is more longer than S phase
(b) S phase is more longer than G1 phase
(c) Both phases are equal in duration
(d) Can’t be determined

Question. In the somatic cell cycle :-
(a) DNA replication takes place in S-phase
(b) A short interphase is followed by a long mitotic phase
(c) G2 phase follows mitotic phase
(d) In G1 phase DNA content is double the amount of DNA present in the original cell

Question. Many cells function properly and divide mitotically even through they do not have :-
(a) Plasma membrane
(b) Cytoskeleton
(c) Mitochondria
(d) Plastids

Question. Which of the following is called heterotypic division :-
(a) Meiosis-I
(b) Meiosis-II
(c) Mitosis
(d) Amitosis

Question. During prophase each centrosome radiates out microtubules called :
(a) Mitotic apparatus
(b) Spindle apparatus
(c) Asters
(d) Spindle fibres

Question. Centromere is required for –
(a) Movement of chromosomes towards poles
(b) Cytoplasmic cleavage
(c) Crossing over
(d) Transcription

Question. At which stage of the cell cycle are histone proteins synthesized in a eukaryotic cell ?
(a) During telophase
(b) During S-phase
(c) During G2-stage of prophase
(d) During entire prophase

Question. Which one of the following statement is incorrect for interkinesis ?
(a) It is the stage between the two subphases of a meiotic division
(b) There is no replication of DNA
(c) DNA replicate but chromosome number remains same
(d) It is generally short lived.

Question. If the n=16 in plant cell then what is possible in metaphase – I of meiosis ?
(a) 32 Bivalents
(b) 16 Telravalents
(c) 16 Bivalents
(d) 32 Bivalents

Question. The two asters together with spindle fibres form:-
(a) Mitotic apparatus
(b) Asters
(c) Astral fibres
(d) Centrosome

Question. Telophase is :
(a) Final stage of karyokinesis
(b) Final stage of mitosis
(c) Mid stage of karyokinesis
(d) First stage of cytokinesis

Question. How many times divisions will occur in an isolated tip cell to form 128 cells ?
(a) 128
(b) 127
(c) 32
(d) 7

Question. In which stage the DNA is doubled :-
(a) Metaphase
(b) Anaphase
(c) Interphase
(d) Prophase

Question. Cytokinesis is :
(a) Formation of cell wall
(b) Formation of cell membrane
(c) Separation of nucleoplasm
(d) Separation of cytoplasm

Question. Prophase which follows the S and G2 phases of interphase, is the first stage of :-
(a) Meiosis-II
(b) Karyokinesis
(c) Interphase
(d) G1 phase

Question. Meiosis involves :
(a) Pairing of homologous chromosomes and recombination between sister chromatids of nonhomologous chromosomes
(b) Pairing of homologous chromosomes and recombination between nonsister chromatids of homologous chromosomes
(c) Pairing of nonhomologous chromosomes and recombination between nonsister chromatids of homologous chromosomes
(d) Pairing of homologous chromosomes and recombination between sister chromatids of homologous chromosomes

Question. When synapsis is complete all along the chromosome, the cell is said to have entered a stage called
(a) Zygotene
(b) Pachytene
(c) Diplotene
(d) Diakinesis

Question. In which on of the following stage, the four chromatids of each bivalent chromosomes becomes distinct and clearly appears as tetrads.
(a) Leptotene
(b) Zygotene
(c) Pachytene
(d) Diplotene

Directions for Assertion & Reason questions

These questions consist of two statements each, printed as Assertion and Reason. While answering these Questions you are required to choose any one of the following four responses.
(A) If both Assertion&Reason are True&the Reason is a correct explanation of the Assertion.
(B) If bothAssertion&Reason are True butReason is not a correct explanation of the Assertion.
(C) If Assertion is True but the Reason is False.
(D) If bothAssertion&Reason are false.

Question. Assertion : Telophase-I leads to formation of diad of cells.
Reason : Telophase-I is marked by completion of karyokinesis and cytokinesis as well.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : M-phase is the most dramatic period of the cell cycle.
Reason : It involves a major reorganisation of virtually all components of the cell.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : Replication of DNA not occurs during interkinesis.
Reason : Division of chromosomes takes place during meiosis-II.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : Each chromatid is attached with two spindle fibres during S-phase :-
Reason : During Anaphse-I each chromosome is found in bivalent form.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : Morphology of chromosomes is most studied during metaphase of cell division.
Reason : Complete disintegration of nuclear envelope marks the start of metaphase, second phase of mitosis.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : Small cells are metabolically less active
Reason : K.I. of small cells is less.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : Kinetochore is essential for cell division.
Reason : Kinetochores serve as the sites of attachment of spindle fibres to the chromosome.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : Crossing over take place during pachytene stage.
Reason : It is a process of interchange of chromatid material between non sister chromatid of homologous chromosomes.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : In anaphase number of chromosomes get doubled.
Reason : During anaphase each chromosome split simultaneously and two daughter chromatids now referred to as chromosomes.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : In plant cells cell plate method is found for cytokinesis instead of cell furrow method.
Reason : Plant cells are enclosed by a relatively inextensible cell wall.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : Cell growth results into division.
Reason : Cell growth leads to change in nucleocytoplasmic ratio.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : Cells in quiscent stage (G0) are metabolically inactive, so don’t show cell division.
Reason : Quiscent stage appears on exit of cell from G2 phase of cell cycle.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : Zygotene is characterised by formation of synaptonemal complex.
Reason : Synaptonemal complex helps in synapsis of non homologous chromosomes.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : Disappearance of nuclear membrane is generally essential for karyokinesis
Reason : Forward movement of chromosomes is dependent on spindle apparatus, which organise in cytoplasm.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : Meiosis is also known as reduction division.
Reason : Meiosis reduces the number of chromosomes in daughter cells.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : In higher plants, the mitosis is termed as anastral mitosis.
Reason : In higher plants, mitosis takes place without spindle fibers.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : Yeast can progress through the cell cycle in only about 90 minutes.
Reason : Duration of cell cycle can vary from organism to organism.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : Meiosis produces four genetically dissimilar cells.
Reason : Crossing over or gene exchange takes place in meiosis.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : Meiosis-I is most significant phenomenon from evolution point of view.
Reason : Meiosis-I leads to reduction in chromosome so that consistancy of chromosome can be maintained.
(a) A
(b) B
(c) C
(d) D

Question. Assertion : During S-phase, amount of DNA per cell doubles.
Reason : During S-phase, there is no increase in chromosome number.
(a) A
(b) B
(c) C
(d) D