What happens during fertilisation in humans after many sperms reach close to the ovum? from Biology Reproductive Health Class 12 Nagaland Board
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What happens during fertilisation in humans after many sperms reach close to the ovum?

  • Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida

  • All sperms excepts the one nearest to the ovum lose their tails

  • Cells of corona radiata trap all the sperms excepts one 

  • Only two sperms nearest the ovum penetrate zona pellucida


A.

Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida

The process of fusion of a sperm with an ovum is called fertilisation. During fertilization, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that blocks the entry of additional sperms. Thus, it ensures that only one sperm can fertilise an ovum. The secretions of the acrosome help the sperm enter into the cytoplasm of the ovum through the zona pellucida and the plasma membrane.

The process of fusion of a sperm with an ovum is called fertilisation. During fertilization, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that blocks the entry of additional sperms. Thus, it ensures that only one sperm can fertilise an ovum. The secretions of the acrosome help the sperm enter into the cytoplasm of the ovum through the zona pellucida and the plasma membrane.

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Progesterone is the contraceptive pill which :
  • Prevents ovulation
  • prevent entry of sperms
  • prevent implantation
  • All the above

D.

All the above
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What is correct about a test tube baby?
  • Fertilization in female's genital tract and growth in test tube
  • Rearing of premature born baby in an incubator
  • Fertilization outside and gestation inside mother's womb
  • Both fertilization and development are done outside the female genital tract.

C.

Fertilization outside and gestation inside mother's womb
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The birth control device not used by women is :
  • Diaphragm
  • Oral pill
  • Condom
  • Copper T

C.

Condom
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The main factor for the growth of human population in India is :
  • high birth rate
  • less death rate
  • lack of education
  • All the above

D.

All the above
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The prenatal technique to determine the genetic disorders in a foetus is called :
  • Laproscopy
  • Amniocentesis
  • Abstinence
  • Coitus nterruptus.

B.

Amniocentesis
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