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प्रश्न
Sexual maturation of reproductive tissues and organs are necessary link for reproduction. Elucidate.
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उत्तर
Sexual maturation of reproductive tissues is a necessary link for reproduction because of the need for specialised cell called germ-cells to participate in sexual reproduction. The body of the individual organism has to grow to its adult size, the rate of general body growth begins to slow down, reproductive tissues begin to mature.
A whole new set of changes in the appearance of the body takes place like change in body proportions, new features appear. This period during adolescence is called puberty. There are also changes taking place that are different between boys and girls. In girls, breast size begins to increase, with darkening of the skin of the nipples at the tips of the breasts. Also, girls begin to menstruate at around this time. Boys begin to have new thick hair growth on the face and their voices begin to crack.
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संबंधित प्रश्न
Write the names of those parts of a flower which serve the same function as the following do in the animals :
(i) testis,
(ii) sperm,
(iii) ovary,
(iv) egg
Write one main difference between asexual and sexual mode of reproduction. Which species is likely to have comparatively better chances of survival – the one reproducing asexually or the one reproducing sexually? Give reason to justify your answer.
Answer the following question.
How does suitable pollination lead to fertilization?
A student is observing the temporary mount of a leaf peel under a microscope. Draw a labelled diagram of the structure of stomata as seen under the microscope
Antipodal cells are present towards the ______ in an anatropous ovule.
In human beings, fertilization occurs in the ______
Length of pollen tube depends on the distance between ______
In a plant flower the female whorl is ______.
What is the structural unit of sexual reproduction in plant?
- Assertion: Primary endosperm nucleus is diploid.
- Reason: It is the product of double fertilisation.
