In our society the women are often blamed for giving birth to daughters. Can you explain why this is not correct?.
Solution and Explanation
Top Questions on Human Reproduction
- Penetration of the sperm in the ovum is followed by:
- CBSE CLASS XII - 2025
- Biology
- Human Reproduction
- During the process of oogenesis in human female, the primary oocyte results in the formation of which of the following?
Choose the correct option.- CBSE CLASS XII - 2025
- Biology
- Human Reproduction
Student to attempt either option (A) or (B):
(A) Explain what is meant by the term amniocentesis. How is this technique misused in India?
OR
(B) Name any two VDs which might occur in a human female. State any two complications in a female if it is left untreated.- CBSE CLASS XII - 2025
- Biology
- Human Reproduction
- Assertion (A): Mode of action of pills and implants/injectables is similar.
Reason (R): The effective period of pills is much longer as compared to implants/injectables.- CBSE CLASS XII - 2025
- Biology
- Human Reproduction
- Given below are few statements with reference to the major events in the menstrual cycle of a human female:
- During the follicular phase, the primary follicles grow to become a Graafian follicle.
- Gonadotropins FSH and progesterone stimulate follicular development during the follicular phase.
- LH surge induces rupture of Graafian follicle thereby releasing the corpus luteum.
- Progesterone released by corpus luteum is essential for maintenance of endometrium.
- Both LH and progesterone attain a peak level in the middle of the cycle.
- CBSE CLASS XII - 2025
- Biology
- Human Reproduction
Questions Asked in CBSE CLASS XII exam
Read the given passage carefully and answer the questions that follow :
In agriculturally important countries, agro products are exchanged for manufactured goods, whereas industrialised nations export machinery and finished products and import food grains and other raw materials. Foreign investment can boost trade in developing countries which lack in capital required for the development of mining, oil drilling, heavy engineering, lumbering and plantation agriculture. By developing such capital intensive industries in developing countries, the industrial nations ensure import of food stuffs, minerals and create markets for their finished products. This entire cycle steps up the volume of trade between nations.
- CBSE CLASS XII - 2025
- International Trade
Study the following graph carefully and answer the following questions
- CBSE CLASS XII - 2025
- Population Geography
Study the map of the Rhine waterway and answer the questions that follow :
- CBSE CLASS XII - 2025
- Transport and Communication
Study the following table carefully and answer the questions that follow :
India – Trends of Urbanisation
Year Number of Towns/UAs Urban Population (in Thousands) % of Total Population Decennial Growth (%) 1931 2,072 33,456.0 11.99 19.12 1941 2,250 44,153.3 13.86 31.97 1951 2,843 62,443.7 17.29 41.42 1961 2,365 78,936.6 17.97 26.41 1971 2,590 1,09,114 19.91 38.23 1981 3,378 1,59,463 23.34 46.14 1991 4,689 2,17,611 25.71 36.47 2001 5,161 2,85,355 27.78 31.13 - CBSE CLASS XII - 2025
- Population Geography
- “In India, water resources are getting polluted with industrial effluents, domestic waste, and insecticides used in agriculture.” Evaluate the statement.
- CBSE CLASS XII - 2025
- Water Resources
Concepts Used:
Gametogenesis
The gametogenesis process includes the formation of reproductive cells or sex cells in living organisms. In plants, it is carried throughout mitosis whereas, in animals, it is carried through meiosis. The formation of male and female gametes are the two basic steps that take place during the gametogenesis process.
Based on the living organism, the process of gametogenesis occurs in:-
Plants: It occurs by the meiotic division of diploid gametocytes. In higher plants, it happens along with sporogenesis.
Animals: It occurs by meiosis where gametes are formed from their diploid mother cells exist in organs called gonads.
Stages of Gametogenesis
The gametogenesis process occurs in three steps. They are as follows;
- Mitotic divisions together with cell growth of precursor germ cells.
- The happening of Meiosis I and Meiosis II for producing haploid daughter cells.
- Metamorphose haploid daughter cells for the production of functional gametes.