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प्रश्न
Give Reasons
Gametes have a haploid (n) number of chromosomes.
उत्तर
The gametes take part in fertilization and after fertilization from the zygote in which the number of chromosomes is doubled. Hence, to maintain a constant number of chromosomes in a species, the gametes have a haploid number of chromosomes.
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संबंधित प्रश्न
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
Give the appropriate term for the following:
Process of fusion of ovum and sperm.
Give Reasons
Millions of sperms are produced at ejaculation yet one sperm actually fertilizes the ovum. Explain.
Give Technical Term:
The place where fertilization occurs in the female reproductive system.
Complete the following sentences with appropriate word:
___________ hormones are secreted by the interstitial cells.
Write a short note on fallopian tube.
Fertilization of the ovum generally takes place in the ______.
What is sex chromosomes?
Match the items in column I with those in column II and write down the matching pairs (some may not match).
| Column I | Column II | ||
| (a) | Acrosome | (i) | An embryo which looks like human baby. |
| (b) | Gestation | (ii) | Luteinizing hormone |
| (c) | Menopause | (iii) | Ovum producing cells. |
| (d) | Foetus | (iv) | Semen |
| (e) | Oogenesis | (v) | Spermatozoa |
| (f) | Ovulation | (vi) | Complete stoppage of menstrual cycle. |
| (vii) | Time taken by a fertilised egg till the delivery of baby. |
