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प्रश्न
How can plants and animals save themselves from extinction?
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उत्तर
Genetic variation helps the organisms to adjust with the changing environment and thereby to maintain their existence. Due to this, plants and animals can save themselves from being extinct.
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संबंधित प्रश्न
Name the following:
The fully developed part of the ovary containing a mature egg.
Choose the odd one in each of the following:
Sperm; implantation; fertilization; ovum; afterbirth
Differentiate between:
Semen and sperm
The figure given alongside represents the female reproductive system of a mammal.
Name the parts labelled A - D
Choose the correct answer:
Virgin birth is called ______________
Name the following:
Organ where fertilization occurs.
Define the following:
Spermatogenesis
The following diagram represents the vertical sectional view of the human female reproductive system.
How does the uterus prepare for the reception of zygote?
Give Reasons
Millions of sperms are produced at ejaculation yet one sperm actually fertilizes the ovum. Explain.
Give Reasons
The acrosome of sperm secretes an enzyme called hyaluronidase at the time of fertilization
Draw a labeled diagram of sperm.
Name the Following
The basic unit of the testes.
Give Technical Term:
How much semen is discharged per ejaculation in a man?
Give Technical Term:
In how many weeks fetus development is completed?
Explain the process of fertilization.
Give any four significances of fertilization in humans.
Choose the odd one out from the group of terms given below and write the category for the remaining terms:
How long after ovulation can the ovum be fertilized?
How are ova classified in terms of yolk content?
