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What is the correct answer?

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

Correct Answer :

B. start dividing


Related Questions

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The substance fertilizin is secreted by

A. ova

B. sperm

C. both and

D. primary spermatogonia

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Antifertilizin is secreted by

A. fertilized egg

B. spermatozoa

C. unfertilized egg

D. egg membranes

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In frog's egg the divisoin is

A. holoblastic

B. meroblastic

C. diploblastic

D. triploblastic

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A true coelom is covered by

A. ectoderm

B. endoderm

C. mesoderm

D. ecto and mesoderm

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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

Metamorphosis is a characteristic feature of

A. direct ontogenic development

B. indirect ontogenic development

C. chordates

D. embryogenesis in mammals

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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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During normal development the activation of the egg is achieved by

A. vitellogenesis

B. oogenesis

C. spermatogenesis

D. fertilization

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Human beings are

A. monoecious

B. dioecius

C. intersexual

D. hermaphrodites

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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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In frog, gastrulation is completed by

A. epiboly

B. emboly

C. both and

D. delamination

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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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4

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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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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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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Oral contraceptives check

A. ovulation

B. fertilization

C. implantation

D. entry of sperms into vagina

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The cellular movements during gastrula-tion are called

A. epiboly

B. emboly

C. morphogenetic movements

D. involution

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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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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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Development of egg without fertilization is termed as

A. parthenogenesis

B. parthenocarpy

C. polyembryony

D. paedogenesis

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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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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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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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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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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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A freshly unfertilised egg of hen contains

A. one cell

B. 100 cells

C. 1000 cells

D. 10000 cells

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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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The sexual embrage of the male and female frogs is called

A. copulation

B. amphimixis

C. syngamy

D. amplexus