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All India - 2016
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Q10 of 51 Page 1

Out of many papaya plants growing in your garden, only a few bear fruits. Give reason.

Only certain papaya plants tend to bear fruits because papaya is a dioecious plant i.e. the male and female flowers are borne on different plants altogether. So, only the plants that bear female flowers would bear fruits.


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6

Name a free-living and a symbiotic bacterium that serve as bio-fertilizer. Why are they so called?

7

Name the cells HIV (Human Immunodeficiency Virus) gains entry into after infecting the human body. Explain the events that occur in these cells.

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How do homologous organs represent divergent evolution? Explain with the help of a suitable example.

14

Name two hormones that are constituents of contraceptive pills. Why do they have high and effective contraceptive value? Name a commonly prescribed non-steroidal oral pill.

OR


(a) How are Parthenocarpic fruits produced by some plants and apomictic seeds by some others? Explain.


(b) When do farmers prefer using apomictic seeds?


Questions · 51
All India - 2016
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