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4

Antifertilizin is secreted by

A. fertilized egg

B. spermatozoa

C. unfertilized egg

D. egg membranes

Correct Answer :

B. spermatozoa


Related Questions

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

A. Spider

B. Crow

C. Honeybee

D. Earthworm

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Human egg is

A. centrolecithal

B. microlecithal

C. mesolecithal

D. telolecithal

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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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4

During normal development the activation of the egg is achieved by

A. vitellogenesis

B. oogenesis

C. spermatogenesis

D. fertilization

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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

Cleidoic eggs are found in

A. birds

B. mammals

C. insects

D. molluscs

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4

The nervous system, epidermis and hairs and nails are derivatives of

A. endoderm

B. mesoderm

C. ectoderm

D. chordomesoderm

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Metamorphosis is a characteristic feature of

A. direct ontogenic development

B. indirect ontogenic development

C. chordates

D. embryogenesis in mammals

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In frog, gastrulation is completed by

A. epiboly

B. emboly

C. both and

D. delamination

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The substance fertilizin is secreted by

A. ova

B. sperm

C. both and

D. primary spermatogonia

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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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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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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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The sexual embrage of the male and female frogs is called

A. copulation

B. amphimixis

C. syngamy

D. amplexus

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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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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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In the growing oocyte, the nucleus enlarges in size due to an increase in

A. Proteins

B. Nucleoplasm

C. DNA

D. RNA

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Oogonia entering the growth phase of oogenesis is called

A. primary oocyte

B. secodnary oocyte

C. ootid

D. gonocyte

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Blastopore in frogs development occurs in

A. blastula and opens in blastocoel

B. blastula and opens in archenteron

C. gastrula and opens in blastocoel

D. gastrula and opens in archenteron

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Antifertilizin is secreted by

A. fertilized egg

B. spermatozoa

C. unfertilized egg

D. egg membranes

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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

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

During the development of frog, the ar-chenteron is formed in

A. early blastula

B. late blastula

C. early gastrula

D. lategastrula

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The formation, development and matura- j tion of the female gamete is called

A. ovulation

B. oogenesis

C. vitellogenesis

D. folliculogenesis

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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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The intestine of tadpole is

A. straight

B. curved

C. coiled

D. zig-zag

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Oral contraceptives check

A. ovulation

B. fertilization

C. implantation

D. entry of sperms into vagina

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Mammalian placenta is

A. a cord between mother and foetus

B. place of attachment in uterus wall where exchange of material between mother and foetus takes place

C. outer covering of foetus

D. allantoic part of the uterus

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4

Sexual reproduction in larval condition is known as

A. paedogamy

B. autogamy

C. isogamy

D. anisogamy