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प्रश्न
Multiple choice question.
Presence of beard in boys is a _______.
विकल्प
primary sex organ
secondary sexual character
secondary sex organ
primary sexual character
उत्तर
Presence of beard in boys is a secondary sexual character.
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संबंधित प्रश्न
Where is DNA found in a cell ?
What is DNA copying?
Why are budding, fragmentation and regeneration, all considered to be asexual type of reproduction?
Match the organisms given in column I with the methods of reproduction/propagation given in column II :
| Column I | Column II | |
| (i) Plasmodium | (a) Spore formation | |
| (ii) Spirogyra | (b) Leaves | |
| (iii) Jasmine | (c) Regeneration | |
| (iv) Apple tree | (d) Budding | |
| (v) Bryophyllum | (e) Binary fission | |
| (vi) Potatoes | (f) Layering | |
| (vii) Rhizopus | (g) Fragmentation | |
| (viii) Hydra | (h) Tubers | |
| (ix) Planaria | (i) Cuttings | |
| (x) Leishmania | (j) Multiple fission | |
| (xi) Sugar cane | (k) Grafting | |
| (xii) Rose |
What is meant by reproduction?
What is the importance of DNA copying in reproduction? Explain with an example.
Find the odd-one out, giving reason.
Gamete, budding, fragmentation, regeneration.
Define the following:
Regeneration
What is the role of the seminal vesicles and the prostate gland?
Explain the term: Pollination.
Answer the following question.
The growing size of the human population is a cause of concern for all people. The rate of birth and death in a given population will determine its size. Reproduction is the process by which organisms increase their population. The process of sexual maturation for reproduction is gradual and takes place while general body growth is still going on. Some degree of sexual maturation does not necessarily mean that the mind or body is ready for sexual acts or for having and bringing up children. Various contraceptive devices are being used by human beings to control the size of the population.
(a) List two common signs of sexual maturation in boys and girls.
(b) What is the result of reckless female foeticide?
(c) Which contraceptive method changes the hormonal balance of the body?
(d) Write two factors that determine the size of a population.
Draw a well labelled diagram of T.S. anther.
What is the use of tablet ‘Saheli’?
The plant which propagates with the help of its leaves is ______.
Identify the chromosome number of the endosperm in the following case. In an angiosperm a female plant having 2n = 24 is crossed with a male plant having 2n = 12.
Assertion and Reason types of Question.
Assertion: In potatoes, shoot arises from eyes.
Reason: Eyes represent the buds.
In a flower, the parts that produce male and female gametes (germ cells) are
The statement ‘nothing lives forever, yet life continues’ illustrates the role of ______.
Choose the correct meaning of reproduction.
