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प्रश्न
The eggs of frogs do not have shells for protection, yet they are safe in water, how?
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उत्तर
Frog’s eggs are without any external covering or shell but a layer of jelly hold the eggs together, thus providing them protection.
This jelly or gelatinous covering also protects them from drying up and prevents them from being eaten up by other animals or predators.
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संबंधित प्रश्न
Define the Zygote.
Give the appropriate term for the following:
Process of fusion of ovum and sperm.
Give appropriate term of the following:
The attachment of developing zygote (blastocyst) on the uterine wall.
How is the fetus protected?
Give Reasons
Millions of sperms are produced at ejaculation yet one sperm actually fertilizes the ovum. Explain.
Complete the following sentences with appropriate word:
Fertilization of the human egg by the sperm normally occurs in the_______
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.
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.
In human beings, after fertilisation, the structure which gets embedded in the wall of uterus is
State whether the following statement is True or False. If false, correct the statement:
External fertilisation can occur both in water and on land.
