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प्रश्न
Differentiate between the following:
Spermatogenesis and oogenesis
Differentiate between spermatogenesis and oogenesis.
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उत्तर
| Spermatogenesis | Oogenesis | ||
| 1. | Spermatogenesis occurs in the testis of mature and fertile males. | 1. | Oogenesis occurs in the ovaries of mature and fertile females. |
| 2. | During spermatogenesis, four haploid sperms are produced from a single spermatogonium. | 2. | During oogenesis, one oogonium produces one haploid ovum and one polar body. |
| 3. | During the process of spermiogenesis, spermatids undergo metamorphosis. | 3. | There is no such process of metamorphosis in oogenesis. |
| 4. | Spermatid development occurs, which results in the formation of a functioning sperm. | 4. | During oogenesis, ootid development does not occur. It only appears after fertilisation. |
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संबंधित प्रश्न
Name the contraceptive device used by the human males which acts as a sheath over the male organ and traps the sperms in it.
In which one of the following birth control methods, a small portion of oviducts of a woman is removed by surgical operation and the cut ends are ligated?
(a) copper-T
(b) tubectomy
(c) vasectomy
(d) diaphragm
One of the following is a surgical method which prevents the sperms from reaching the ovum and pregnancy does not occur. This method is :
(a) IUCD
(b) vasectomy
(c) condom
(d) tubectomy
In the surgical method of birth control available for human females, the structures P in the reproductive system are cut and ligated (tied up) properly at both ends. This prevents the reproductive cell Q released by an organ R from entering the structures P so that Q is not available to fuse with another reproductive cell S coming from the male reproductive system. In this way, pregnancy is prevented.
(a) What are structures P?
(b) What is cell Q?
(c) Name the organ R.
(d) What is the reproductive cell S?
(e) What is the name of this surgical method of birth control available to females?
Name the kind of diseases/disorders and any two symptoms that are likely to occur in humans if Mutation in the gene that codes for an enzyme phenylalanine hydroxylase occurs.
Reproductive health includes ______.
Reproduction is linked to stability of population of a species. Justify the statement.
Given below are events that lead to pregnancy and development of embryo.
- Fertilization of egg
- Maturation of egg
- Release of egg
- Embedding of embryo in thickened uterine wall.
Which of the following options gives the correct order of sequence in which they occur?
John and Radha were classmates since childhood. When Radha became eleven years old, she developed a little swelling on her neck. She visited the doctor who started medication for her. After a few years, John also developed a slight protrusion on his throat. He got worried and went to the doctor. But, the doctor assured him that it was a normal feature in boys while they are growing up. Can you think of any reasons for the difference in diagnoses?
Observe the chart and graph given in the figure carefully and answer the following questions.
| Age in Years |
% of full height | |
| Boys | Girls | |
| 8 | 72% | 77% |
| 9 | 75% | 81% |
| 10 | 78% | 84% |
| 11 | 81% | 88% |
| 12 | 84% | 91% |
| 13 | 88% | 95% |
| 14 | 92% | 98% |
| 15 | 95% | 99% |
| 16 | 98% | 99.5% |
| 17 | 99% | 100% |
| 18 | 100% | 100% |
- Which of the line represents the height of boys?
- Which line represents the height of girls?
- What is the difference between the pattern of increase in the height of boys and girls?
- Is this pattern true for each individual?
