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Published on: 28/05/2021
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Questions + Answers key
Take MCQ Biology Test1.
Are pollination and fertilisation necessary in apomixis?
2.
Strawberry is sweet and eaten raw just like any other fruit. Why do botanists call it a false fruit?
3.
If one can induce parthenocarpy through the application of growth substances, which fruits would you select to induce parthenocarpy and why?
4.
Label the following

5.
Why should a breeder need to emasculate a bisexual flower? Mention a condition in a flower, where emasculation is not necessary?
6.
If you squeeze a seed of orange, you might observe many embryos of different sizes. How is it possible? Explain.
7.
Explain how geitonogamy is functionally similar to cross-pollination and genetically similar to autogamy.
8.
Geitonogamous flowering plants are genetically autogamous, but functionally cross-pollinated. Justify.
9.
In case of polyembryony, if an embryo develops from the synergid and another from the nucellus, which is haploid and which is diploid?
1.
No, pollination and fertilisation are not necessary in apomixis. It is a form of asexual reproduction that mimics sexual reproduction. It is the formation of seeds without fertilisation.
2.
In most of the plants, by the time fruit develops from the ovary, other floral parts degenerate and fall off. However, in case of strawberry, thalamus also contributes in fruit formation. So, it is called false fruit.
3.
The fruits selected to induce parthenocarpy can be watermelon, papaya, etc. It is because these fleshy fruits have a large number of seeds, which interfere with the preparation of jams, jellies, etc.
4.

5.
1. Emasculation is necessary to prevent the self-pollen grains falling on the stigma.
2. Emasculation is not needed when the female parent chosen bears unisexual, i.e. female flowers.
6.
1. It is a case of polyembryony, the phenomenon of occurrence of more than one embryo in a seed.
2. It is possible in the following ways:
(i) Some of the nucellar cells surrounding the embryo sac start dividing, protrude into the embryos.
(ii) Synergids of the embryo sac divide and form embryos.
7.
1. Since geitonogamy involves two different flowers of the same plant, it is genetically similar to autogamy; both autogamy and geitonogamy do not result in genetic variation in the progeny.
2. Geitonogamy and cross-pollination involve different flowers and a pollinating agent.
8.
1. Since geitonogamy involves two different flowers of the same plant, it is genetically similar to autogamy; both autogamy and geitonogamy do not result in genetic variation in the progeny.
2. Geitonogamy and cross-pollination involve different flowers and a pollinating agent.
9.
1. Embryo developing from synergid is haploid.
2. Embryo developing from nucellus is diploid.
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