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4

The first phase in the sexual reproduction of organisms is

A. spermatogenesis

B. oogenesis

C. spermiogenesis

D. gametogenesis

Correct Answer :

D. gametogenesis


Related Questions

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4

During metamorphosis, the disappearance of larval organs is called

A. histogenesis

B. paedogenesis

C. histolysis

D. paedomorphosis

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In forg, the sperms released from the testis take the following route to reach the ureter:

A. Vasa efferentia, Bidder's canal, uriniferous tubule and nephrotome

B. Vasa efferentia, Bidder's canal, and uriniferous tubule

C. Vasa efferentia, uriniferous tubule nd Bidder's canal.

D. Vasa deferentia, uriniferous tubule and Bidder's canal

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4

Development of egg without fertilization is termed as

A. parthenogenesis

B. parthenocarpy

C. polyembryony

D. paedogenesis

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4

Meroblastic cleavage is found in

A. man

B. hen's egg

C. frog

D. rabbit

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The formation of the neural tube is known as

A. neurulation

B. tubulation

C. crania tion

D. none of these

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4

In the human female, the primary oocytes remain small without any growth for

A. 4-5 years

B. 6-8 years

C. 8 - 10 years

D. 12 -14 years

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4

The sperm produces substances of enzymatic nature of sperm lysin. In mammals, it is called

A. hyaluronidase

B. hyaluronic acid

C. androgamone

D. cryanogamone

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4

Human beings are

A. monoecious

B. dioecius

C. intersexual

D. hermaphrodites

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4

For fertilization of the frog's egg

A. sperms of same species are essential

B. sperms do not need penetration

C. sperms of any animal can fertilize

D. only presence of male is sufficient

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4

If an unfertilized frog's egg is pricked with a micro-needle, it will

A. die immediately

B. start dividing

C. will remain undivided

D. transform into a tadpole at a faster rate

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4

The allantoic vesicle arises from

A. foregut

B. midgut

C. hindgut

D. somatopleure

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4

Laternal line system of sense organs present in the skin of tadpole larva

A. completely disappears during metamorphosis

B. partialy retained during metamorphosis

C. partially disappears during later stages of metamorphosis

D. fully retained in the adult frog

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4

How many cleavages are completed in 16 cell stages of frog's egg ?

A. 3

B. 8

C. 4

D. 12

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4

Which one has the capacity to reproduce without fertilization of eggs ?

A. Spider

B. Crow

C. Honeybee

D. Earthworm

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4

During fertilization the spermatozoa penetrate through the egg membranes with the help of

A. flagellum

B. acrosome

C. sperm lysins released from the acrosome

D. mitochondira located at the middle piece

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During cleavage, the embryo

A. enlarges in size

B. decreases in size

C. retains the same size at the beginning

D. gradually enlarges in size

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The substance fertilizin is secreted by

A. ova

B. sperm

C. both and

D. primary spermatogonia

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The expulsion of completely developed foetus from the uterus is known as

A. ovuation

B. placentation

C. gestation

D. parturition

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The process of synthesis of yolk by the oocyte is termed

A. folliculogenesis

B. oogenesis

C. vitellogenesis

D. spermiogenesis

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4

The first phase in the sexual reproduction of organisms is

A. spermatogenesis

B. oogenesis

C. spermiogenesis

D. gametogenesis

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4

During normal development the activation of the egg is achieved by

A. vitellogenesis

B. oogenesis

C. spermatogenesis

D. fertilization

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4

The intestine of tadpole is

A. straight

B. curved

C. coiled

D. zig-zag

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4

Which of the following develops from ectoderm ?

A. Spinal cord and brain

B. Liver and heart

C. Eye and skin

D. Notochord and vertebral colum.

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4

When the eggs are released from the ovary of frogs they are at the

A. primary oocyte stage

B. secondary oocyte stage

C. ootid stage

D. matured ova stage

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4

Metamorphosis is a characteristic feature of

A. direct ontogenic development

B. indirect ontogenic development

C. chordates

D. embryogenesis in mammals

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4

Constructive change in the development of frog from tadpole is

A. disappearance of tail

B. food habit becoming carnivore

C. land habit

D. excretion beocmes mesonephric

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In order to become structurally and functionally a spermatozoan, each spermatid has to undergo a process of differentiation called

A. spermiation

B. spermiogenesis

C. spermatogenesis

D. androgenesis

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4

A true coelom is covered by

A. ectoderm

B. endoderm

C. mesoderm

D. ecto and mesoderm

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4

The sexual embrage of the male and female frogs is called

A. copulation

B. amphimixis

C. syngamy

D. amplexus

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4

Grey cresent is present in

A. zygote of frog

B. brain of rabbit

C. eye of frog

D. retina of cockroach