Zoology XII - Reproduction in Organism 02

Question : 1

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Which of the following event of sexual reproduction is included under prefertilization event?

Options:

	Zygote formation
	Embryogenesis
	Gametogenesis
	All of these

Solution :

Gametogenesis and gamete transfer are two prefertilization events.

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Question : 2

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Meiocytes are the characteristic cells of which types of organisms?

Options:

	Diploid organisms undergo asexual reproduction only
	Haploid organisms undergo sexual reproduction only
	Diploid organisms undergo sexual reproduction
	Haploid organisms undergo asexual reproduction

Solution :

In diploid organisms specialized cells called meiocytes are present which undergo meiosis

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Question : 3

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For normal sexual reproduction, if the parent body is diploid, the gamete should be

Options:

	Diploid formed by mitosis division
	Haploid formed by mitosis division
	Diploid formed by meiotic division
	Haploid formed by meiotic division

Solution :

If the parent body is diploid then gametes are haploid which are formed by meiotic division

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Question : 4

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Choose the incorrect match w.r.t. ploidy level of different cells

Options:

	Gamete mother cell – Diploid
	Sperm – Haploid
	Ovum – Haploid
	Meiocyte – Haploid

Solution :

Meiocytes are gamete mother cell which are diploid

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Question : 5

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Choose the correct option w.r.t the functions of labelled structures A and B in given diagrams of reproductive systems of cockroach.

                     A                                       B

Options:

	Formation of ova                  Formation of ova
	Formation of sperms            Formation of ova
	Formation of ova                  Formation of sperms
	Formation of fertilized egg     Formation of sperms

Solution :

A – Ovary of cockroach related with
formation of ova.
B – Testis of cockroach related with
formation of sperms

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Question : 6

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If the chromosome number in meiocytes of dog is 78 then choose the correct option w.r.t. the number of chromosomes in sperms of dog.

Options:

	78
	39
	156
	Sometimes it is 39 and rarely it is 78

Solution :

Gametes (sperms) are haploid structures so the number of chromosome is half of meiocytes (diploid).

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Question : 7

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During gamete transfer, a large number of male gametes, however, fail to reach the female gametes. To compensate this loss of male gametes during transfer/transport, the number of male gametes are always_______ than the number of female gametes.

Options:

	More
	Less
	Equal
	Both (2) & (3)

Solution :

Number of male gametes are always more than the female gamets.

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Question : 8

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Choose the correct option w.r.t. animals, chromosome numbers in meiocyte and gamete.

Options:

	1
	2
	3
	4

Solution :

In human – meiocytes have 46 chromosomes.

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Question : 9

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Given below is a diagrammatic representation of gametes of Homo sapiens (Human beings)

Choose the correct option w.r.t. the category of the given gametes

Options:

	Homogametes which are similar in appearance
	Isogametes which are haploid
	Heterogametes that are two morphologically distinct gametes and are diploid
	Heterogametes and are haploid

Solution :

In humans, heterogametes are present which are haploid.

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Question : 10

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Choose the correct statement w.r.t. the labelled structures in the body of earthworm

Options:

	As 'A' becomes mature it produces diploid sperms which are fertilized in same body
	As 'B' becomes mature, it produces haploid ova which comes out of the body of earthworm
	As 'A' becomes mature, it produces diploid ova which are always present in the body of earthworm
	As 'B' becomes mature, it produces haploid sperms which comes out of the body of earthworm.

Solution :

A – Testis of earthworm.
B – Ovary of earthworm