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प्रश्न
Draw a well labelled diagram of L.S. human testis.
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उत्तर १
उत्तर २
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संबंधित प्रश्न
Mention the problems that are taken care of by reproduction and child health care programme.
What is amniocentesis and why there is a statutory ban on it?
What does IUCD indicate?
What is the causative organism for AIDS?
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?
The human males use a device X made of a very thin rubber sheet as a covering on the male organ to prevent pregnancy. This device traps the gametes Y in it. In order to prevent pregnancy, the human females use a device Z which is a circle of rubber with a metal spring around it. The device Z is put inside the vagina to cover the cervix. It stops Y from going into the uterus.
(a) What is device X?
(b) What are Y?
(c) Name the device Z.
(d) What is the general name of these methods of birth control (or preventing pregnancy)?
(e) The use of which contraceptive device, X or Z, can protect the persons from sexually transmitted diseases?
A woman uses pills A as a method of birth control (or preventing pregnancy). The pills A stop the ovaries from releasing ovum into oviducts. Another woman uses pills B as a method of birth control. The pills B kill the sperms and prevent pregnancy.
(a) What do the pills A contain?
(b) What is the common name of pills A?
(c) What do the pills B contain?
(d) What is the common name of pills B?
(e) What is the general name of these methods of birth control?
Name the kind of diseases/disorders that are likely to occur in humans if
(i) mutation in the gene that codes for an enzyme phenyl alanine hydrolase occurs,
(ii) there is an extra copy of chromosome 21,
(iii) the karyotype is XXY.
Give scientific reasons.
Indians should follow family planning for controlling the population.
RCH stands for ______.
A dark stained body present in the somatic cells of human female but absent from those of male is ______.
From the internet, gather information about the chromosome numbers of five animals and five plants. Correlate the number with the size of organism and answer the following questions.
- Do larger organisms have more number of chromosomes/cells?
- Can organism with fewer chromosomes reproduce more easily than organisms with more number of chromosomes?
- More the number of chromosomes/cells greater is the DNA content. Justify.
Reproduction is linked to stability of population of a species. Justify the statement.
Trace the path of sperm during ejaculation and mention the gland and their functions associated with the male reproductive system.
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?
It is believed that height of a child depends upon the genes inherited from parents. However, it is often seen that tall parents may have short children and vice-versa. Are there factors other than genes that can cause these variations?
Comment on the Reproductive and Child Health Care programme of the government to improve the reproductive health of the people.
Given below are four aspects of Reproductive Health in Column A and their related information in Column B:
| Column A | Column B | ||
| S. No. | Terms used in Reproductive Health | S. No. | Significant information |
| (A) | MTP | (i) | Analysing fetal cells from amniotic fluid of the foetus |
| (B) | Amniocentesis | (ii) | Legalised in 1971 |
| (C) | Saheli | (iii) | Programme initiated in 1951 |
| (D) | Family Planning | (iv) | Non-steroidal oral Planning contraceptive |
Select the correct match from the following options:
Which is the most commonly prescribed non-steroidal oral contraceptive pill in India?
