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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
Define the Zygote.
Name the following:
The accessory gland in human males whose secretion activates the sperms
Suppose a normal woman has never borne a child; How many mature eggs would she have produced in her lifetime? Your calculation should be based on two clues-
(a) Eggs are produced at the rate of 1 egg every 28 days (one menstrual cycle)
(b) A woman’s total reproductive period is 13 – 45 years.
Give the appropriate term for the following:
Process of fusion of ovum and sperm.
Given below is a portion of the diagram to show the diagrammatic highly magnified view of a single human sperm. Complete the diagram to show its normal structure.
State whether the following statement is true or false:
Fertilization occurs in the vagina.
Give appropriate term of the following:
The attachment of developing zygote (blastocyst) on the uterine wall.
The diagram given below is that of a developing human foetus in the womb. Study the same and answer the question that follow:
What term is given to the period of development of the foetus in the womb?
Give Reasons
The urethra is also called urinogenital duct.
Give Reasons
A large number of sperms are required for fertilizing one egg.
Give a labeled structure of ovum.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Sperm is a single cell.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Sperm is a highly motile male gamete.
Write the functional activity of the following structure:
Prostate gland
Multiple choice question.
In human female, the fertilized egg gets implanted in uterus _______.
Give scientific reason.
The new individual produced by sexual reproduction always has the recombined genes of both the parents.
The enzyme involved in penetration of sperm into ovum is ______.
State whether the following statement is True or False. If false, correct the statement:
Human egg has a head, middle piece and tail.
