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After a sperm has penetrated an ovum, en...

After a sperm has penetrated an ovum, entry of further sperm is prevented by

A

condensation of yolk

B

formation of pigment coat

C

development of vitelline membrane

D

development of cortical reaction

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The correct Answer is:
D
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TRUEMAN BIOLOGY-HUMAN REPRODUCTION-Multiple Choice Questions
  1. The eggs of some mammals have more yolk. They are

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  2. The primary egg membrane of mammalians egg is termed as -

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  3. After a sperm has penetrated an ovum, entry of further sperm is preven...

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  4. Fusion of male and female pronuclei of two conjugate Paramecium is kno...

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  5. Cleavage is a unique form of mitotic cell division in that

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  6. During cleavage, the cell division is very rapid. The daughter cells d...

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  7. Which one of the following is incorrect?

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  8. In embryo,cleavage brings about

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  9. A zygote is completely divided into two by a cleavage furrow. The clea...

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  10. Solid ball like structure formed after completion of cleavage is

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  11. A morula can be differentiated from blastula in

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  12. Morphogenetic movements convert hollow spherical blastula into

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  13. The best definition of the process of gastrulation is that it is a pro...

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  14. Notochord develops from

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  15. Extra embryonic membrane of the mammals embryo are derived from

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  16. Mammalian foetus is directly surrounded by

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  17. The fluid released from the vagina just prior to childbirth is

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  18. Blood flowing through umbilical cord of mammalian embryo is

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  19. Drugs causing embryo malformations during pregnancy are called

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  20. The chemical substances released by activated spermatozoa that acts on...

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