CBSE - Reproduction in Organisms MCQs | CBSE Solution of Class 12 Biology Reproduction in Organisms

61 The cut part of a plant stem (having roots and is fixed to the ground) used in the process of grafting is...

[1] scion

[2] cutting

[3] bud

[4] stock

Answer: stock

62 ______ is the simplest method of asexual reproduction in unicellular organisms

[1] Budding

[2] Fragmentation

[3] Spore formation

[4] Binary fission

Answer: Binary fission

63 In human cells, there are ______ chromosomes.

[1] 23

[2] 32

[3] 46

[4] 64

Answer: 46

64 The menstrual cycle in human female is repeated about every ______ days.

[1] 14

[2] 21

[3] 28

[4] 270

Answer: 28

65 What is formed after fertilization?

[1] A sperm

[2] An ovum

[3] A zygote

[4] A gamete

Answer: A zygote

66 The temperature in the scrotum is about ______ than the body temperature.

[1] 2-3^o C higher

[2] 5-6^o C higher

[3] 2-3^o C lower

[4] 5-6^o C lower

Answer: 2-3^o C lower

67 How many chromosomes are present in the gamate of human male?

[1] 46

[2] 23

[3] 1

[4] 22

Answer: 23

68 Which of the following plants shows vegetative propagation?

[1] Bryophyllum

[2] Sunflower

[3] Jute

[4] Wheat

Answer: Bryophyllum

69 In asexual reproduction, two off-springs having the same genetic material and same body features are called...

[1] callus

[2] twins

[3] clones

[4] chromosomes

Answer: clones

70 In this method Parents cell divides into many daughter cells.

[1] Budding

[2] Multiple fission

[3] Binary fission

[4] Fission

Answer: Multiple fission

71 Propagules used to raise

[1] growth

[2] new plants

[3] old plants

[4] all the above.

Answer: new plants

72 In algae -----is the medium for gamete Transfer.

[1] air

[2] anther

[3] water

[4] tentacles

Answer: water

73 Development of zygote depends on?

[1] Life cycle of the organism

[2] Environment it is exposed to

[3] Both 1 and 2

[4] None of the above.

Answer: Both 1 and 2

74 -------is for increase the number of cells.

[1] Cell enlargement

[2] Cell division

[3] Cell differentiation

[4] Zygote

Answer: Cell division

75 If the gametes are similar in their appearance they are called as

[1] anisogametes

[2] isogametes

[3] Homogametes

[4] Both 3 and 2

Answer: Both 3 and 2

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