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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 term Gamete.
When pregnancy does not occur, the life of corpus luteum is about ______.
Name the following:
The fully developed part of the ovary containing a mature egg.
Differentiate between the following pair:
Efferent duct and sperm duct
State whether the following statement is true or false:
Gestation in humans is completed in about 380 days.
Name the following:
Virgin birth
The diagram given below is that of a developing human foetus in the womb. Study the same and answer the question that follow:
Mention two functions of the parts labelled '2' other than its endocrine functions.
Study the diagram given below and then answer the questions that follow:
(i) Name the part labeled A. Name any two hormones produced by the part labeled A.
(ii) What happens to the part labeled B.
(1) if fertilization takes place?
(2) If fertilization does not take place?
(iii) Where does fertilization occur?
(iv) Draw a neat diagram of the human sperm as seen under high magnification and label the following parts.
(1) Acrosome
(2) Mitochondria
Name the Following
The basic unit of the testes.
Give Technical Term:
What term is used for the production and maturation of sperms in the testes?
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Vas deferens transports sperms into the urethra.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
The process of fusion of the sperm nucleus and the egg nucleus is termed implantation.
Write the functional activity of the following structure:
Seminal vesicles
Write a short note on fallopian tube.
Explain the process of fertilization.
How many hours are required for the process of capacitation?
Fertilization of the ovum generally takes place in the ______.
State whether the following statement is True or False. If false, correct the statement:
External fertilisation can occur both in water and on land.
State whether the following statement is True or False. If false, correct the statement:
Human egg has a head, middle piece and tail.
Choose the odd one out from the group of terms given below and write the category for the remaining terms:
