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4

In frog, gastrulation is completed by

A. epiboly

B. emboly

C. both and

D. delamination

Correct Answer :

C. both and


Related Questions

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In frog's egg the divisoin is

A. holoblastic

B. meroblastic

C. diploblastic

D. triploblastic

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Sexual reproduction in larval condition is known as

A. paedogamy

B. autogamy

C. isogamy

D. anisogamy

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The first phase in the sexual reproduction of organisms is

A. spermatogenesis

B. oogenesis

C. spermiogenesis

D. gametogenesis

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Grey cresent is present in

A. zygote of frog

B. brain of rabbit

C. eye of frog

D. retina of cockroach

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Development of egg without fertilization is termed as

A. parthenogenesis

B. parthenocarpy

C. polyembryony

D. paedogenesis

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Oral contraceptives check

A. ovulation

B. fertilization

C. implantation

D. entry of sperms into vagina

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Which of the following does not show metamorphosis ?

A. Frog

B. Housefly

C. Hydra

D. Mosquito

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A true coelom is covered by

A. ectoderm

B. endoderm

C. mesoderm

D. ecto and mesoderm

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Embryo sac in a hen's egg is formed by

A. ectoderm

B. meso derm

C. somatic mesoderm and endoderm

D. splanchnic mesoderm and ectoderm

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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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In frog, gastrulation is completed by

A. epiboly

B. emboly

C. both and

D. delamination

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4

The formation of the neural tube is known as

A. neurulation

B. tubulation

C. crania tion

D. none of these

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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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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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Antifertilizin is secreted by

A. fertilized egg

B. spermatozoa

C. unfertilized egg

D. egg membranes

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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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Meroblastic cleavage is found in

A. man

B. hen's egg

C. frog

D. rabbit

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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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Cleidoic eggs are found in

A. birds

B. mammals

C. insects

D. molluscs

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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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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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Human egg is

A. centrolecithal

B. microlecithal

C. mesolecithal

D. telolecithal

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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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The intestine of tadpole is

A. straight

B. curved

C. coiled

D. zig-zag

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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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Spermatoliosis is a process by which

A. the spermatids differentiate into spermatozoa

B. primary spermatcyte is tarnsformed into a secondary spermatocyte

C. spermatogonea complete multiplication phase

D. secondary spermatocyte extrudes polar bodies

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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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During metamorphosis, the disappearance of larval organs is called

A. histogenesis

B. paedogenesis

C. histolysis

D. paedomorphosis

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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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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