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Solution for Class 12, Biology, Cell Biology

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A bacteria divides in every one minute. A cup is filled in one hour. Time taken to fill one-fourth cup isa. 30 Minutes b. 59 minutes c. 29 minutes d. 58 minutes

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Cell biology

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A cell divides every one minute. At this rate of cell division it can fill a 100ml of beaker in one hour. How much time does it take to fill a 50ml of beaker?a. 30 minutes b. 60 minutes c. 59 minutes d. 32 minutes

Topic:

Cell biology

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A cell has 20 chromosomes. After meiosis .................... chromosomes are present in the daughter cells.

Topic:

Cell biology

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A cell has 46 chromosomes at each pole in mitotic telophase. In this division the number of chromatids at the metaphase was :-a. 23 b. 46 c. 69 d. 92

Topic:

Cell biology

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A stage in cell division is shown in the figure. Select the answer which gives correct identification of the stage with its characteristics:

Topic:

Cell biology

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A stage in mitosis that begins in mid anaphase and completed with telophase isa. Crossing over b. Karyokinesis c. Cytokinesis d. Interkinesis

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Cell biology

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A stage in mitosis that starts towards the middle of anaphase and is completed with the telophase is Or Division of cytoplasm after completion of nuclear division is called a. Cytokinesis b. Kayokinesis c. Crossing over d. Interkinesis

Topic:

Cell biology

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Anaphase stage is characterised bya. Centromeres split and chromatids separate b. Chromatids move to opposite poles c. Nucleolus, GB and ER reform d. Both A and B

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Cell biology

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Anastral mitosis is found in
(a) Lower animals
(b) Higher animals
(c) All plants
(d) All living organismsa. Lower animals b. Higher animals c. All plants d. All living organisms

Topic:

Cell biology

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Question 10

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Assertion :- Chiasmata is the result of crossing over.
Reason:- Chiasmata arise during pachytene so that crossing over can take palcea. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion. b. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion c. If Assertion is True but the Reason is False d. If both Assertion & Reason are false.

Topic:

Cell biology

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Question 11

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Assertion: During anaphase, centromere of each chromosome splits and chromatids separate.
Reason: During anaphase, chromatids move to opposite poles. a. If both assertion and reason are true and reason is the correct explantion of assertion b. If both assertion and reason are true but reason is not the correct explnantion of assertion. c. If assertion is true but reason is false. d. If both assertion and reason are false.

Topic:

Cell biology

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Question 12

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Assertion :- During M phase of karyokinesis of mitosis each chromosomes is made up of two

chromatids.
Reason:- Before M phase DNA content have already been doubled during S-phase.a. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
b. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion
c. If Assertion is True but the Reason is False
d. If both Assertion & Reason are false.

Topic:

Cell biology

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Question 13

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Assertion :- During meiosis-I there is no division of chromosome.
Reason:- During meiosis-I there is separation and movement of homologous, in order to reduce thenumber of chromosome half in daughter cells.a. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion. b. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion c. If Assertion is True but the Reason is False d. If both Assertion & Reason are false.

Topic:

Cell biology

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Question 14

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Assertion: Histone proteins are synthesised during S-phase.
Reason: Histone proteins are found associate with DNA to form bead-like nucleosomes.a. Both assertion and reason are true and the reason is a correct explanation of assertion. b. Both assertion and reaso are true, but the reason is not the correct explanation of the assertion. c. Assertion is true, but reason is false d. Assertion is false, but reason is true

Topic:

Cell biology

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Question 15

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Assertion: Karyokinesis occurs in M-phase
Reason: Cell division stops in M-phase. a. If both assertion Reason are True the Reason is a correct explanation of the Assertion. b. If both Assertion Reason are True but Reason is not correct explanation of the Assertion. c. If Assertion is True but the Reason is False. d. If both Assertion &&&& Reason are false

Topic:

Cell biology

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Question 16

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Assertion: Small disc-shaped structures at the surface of the centromeres are called kinetochores.
Reason: Kinetochores serve as the sites of attachement of spindle fibres to the centreomeres. a. If both assertion and reason are true and reason is the correct explantion of assertion b. If both assertion and reason are true but reason is not the correct explnantion of assertion. c. If assertion is true but reason is false. d. If both assertion and reason are false.

Topic:

Cell biology

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Question 17

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Assertion: The duration of cell cycle can vary from organism to organism and also from cell type to cell type
Reason: Human cells in culture divided once in approximately 24 hours.a. If both assertion and reason are true and the reason is the correct explanation of the assertion. b. If both assertion and reason are true but reason is not the correct explanation of the assertion. c. If assertion is true but reason is false. d. If both assertion and reason are false.

Topic:

Cell biology

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Question 18

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Assertion: During anaphase-II, the chromatids of a chromosome separate.
Reason: Centromere of a mitotic chromosome divides during anaphase. a. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion. b. If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion. c. If Assertion is true, but Reason is false. d. If both Assertion and Reason are false.

Topic:

Cell biology

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Question 19

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Assertion:Meiosis causes variations in population from one generation to the next.
Variations are very important for the process of evolution.a. If both assertion and reason are true and the reason is the correct explanation of the assertion. b. If both assertion and reason are true but reason is not the correct explanation of the assertion. c. If assertion is true but reason is false. d. If both assertion and reason are false.

Topic:

Cell biology

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Question 20

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Assertion:Meiosis ensures the production of haploid phase in the lifecycle of sexually reproducing organisms.
Fertilisation restores th diploid phase.a. If both assertion and reason are true and the reason is the correct explanation of the assertion. b. If both assertion and reason are true but reason is not the correct explanation of the assertion. c. If assertion is true but reason is false. d. If both assertion and reason are false.

Topic:

Cell biology

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