How do organisms reproduce Worksheet-15
Subjective questions:
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What criteria and precautions should be taken into consideration while selecting stock and scion?
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Describe how vegetative propagation is done in the following plants :
(a) Ginger (b) Sugarcane (c) Citrus (d) Bryophyllum
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Explain the main characters of self-pollinated plants.
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Explain the method of vegetative reproduction in mint, sweet potato, Dahlia, onion and Chrysanthemum.
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What is fission? What are the different types of fission? Explain them with the help of diagrams.
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Write a note on fertilisation in human beings.
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Describe how sexual reproduction is a necessity for evolution.
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Enumerate the events of female menstrual cycle starting from the maturation of a group of follicles.
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Define grafting. Suggest any two advantages and disadvantages of grafting.
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"DNA copies generated will be similar, but may not be identical to the original." Explain.
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Why is variation of organisms important? Give an example.
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What changes are noticed on sexual maturity of human beings?
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Mention the important post-fertilisation changes in the flower.
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Define secondary sex characters. Give three examples each in male and female.
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What is grafting? Write any two uses of this process.
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(i) Mention the various methods used to prevent pregnancy. Give one example of each.
(ii) Why is it done so?
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How can the reproductive health be maintained and sexually transmitted diseases (STD) prevented?
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What is a seed? How does it help in reproduction in plants?
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Define the term layering. What are its two types? How is one different from the other?
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What role do hormones play in the process of reproduction?
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How does binary fission differ from multiple fission?
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Why is vegetative propagation practiced for growing some types of plants?
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Why is DNA copying an essential part of the process of reproduction?
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How is the process of pollination different from fertilisation?
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What are the advantages of sexual reproduction over asexual reproduction?
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Draw a labelled diagram of the longitudinal section of a flower.
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What are the different methods of contraception?
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How are the modes of reproduction different in unicellular and multicellular organisms?
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What could be the reasons for adopting contraceptive; methods?
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Draw the diagram of a flower to show its male and female reproductive parts. Label the following on it :
(i) Ovary (ii) Anther (iii) Filament (iv) Stigma
What is the function of anther? How does fusion of male and female gametes take place in plants?