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प्रश्न
Give Reasons
Millions of sperms are produced at ejaculation yet one sperm actually fertilizes the ovum. Explain.
उत्तर
Only one ovum is released at a time in the human female during ovulation. Although millions of sperms are ejaculated only one sperm is enough to fertilize the single ovum. This arrangement is to control and maintain the growth rate of the human population. The ovum secretes a protective wall that prevents the entry of other sperms.
APPEARS IN
संबंधित प्रश्न
Define the term Gamete.
Differentiate between:
Semen and sperm
Complete the following statement by choosing the correct alternative:
Fertilization occurs in ______.
The diagram given below is that of a developing human foetus in the womb. Study the same and answer the question that follow:
Name (any one) hormone produced by the part labelled '2'.
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.
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.
The enzyme involved in penetration of sperm into ovum is ______.
What are autosomes chromosomes?
Choose the odd one out from the group of terms given below and write the category for the remaining terms:
