Botany

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* 1. Double fertilization was first discovered by Nawaschin (1898) in

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* 2. The term ‘clone’ cannot be applied to offspring formed by sexual reproduction because

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* 3. Which of the following is false about external fertilization?

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* 4. In angiosperms each pollen grain produces two sperms. What do these sperms do in fertilization of a flower

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* 5. How many given statements are incorrect
(i)In the most common type of endosperm is free-nuclear endosperm.
(ii)In wheat, maize, barley, castor, sunflower and coconut endosperm completely consumed by the developing embryo before seed maturation.
(iii) In pea, groundnut, beans endosperm persist in the mature seed and be used up during seed germination.        
(iv) Most zygotes divide only after certain amount of endosperm is formed.
(v) In some seeds such as black pepper and beet, perisperm present.
(vi) In mature seed, water content is 10 – 15 per cent moisture by mass.

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* 6. Seed is the basis of our agriculture and it offers several advantages to angiosperms. Select correct statement for it.
(i)Seeds have better adaptive strategies for dispersal to new habitats and help the species to colonise in other areas.
(ii)As they have sufficient food reserves, young seedlings are nourished until they are capable of photosynthesis on their own.
(iii)The hard seed coat provides protection to the young embryo.
(iv) Being products of sexual reproduction, they generate new genetic combinations leading to variations.
(v) Seeds of a large number of species live for several years.

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* 7. A dicotyledonous plant bears flowers but never produces fruits and seeds. The most probable cause for the above situation is

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* 8. Choose the correct statement from the following

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* 9. While planning for an artificial hybridization programme involving dioecious plants, which of the following steps would not be relevant?

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* 10. In the embryos of a typical dicot and a grass, true homologous structures are

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