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Question
Explain any three advantages that seeds offer to angiosperms.
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Solution
Seeds offer the following advantages to angiosperms:
(i) They provide nourishment and parental care to the developing embryo.
(ii) They protect the embryo from harsh environmental conditions.
(iii) The dispersal of seeds to far-off places prevents competition among the members of the same species, thus preventing their extinction.
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State what is apomixis. Comment on its significance. How can it be commercially used?
Define Apomixis.
Answer the following question.
When a seed of orange is squeezed, many embryos, instead of one are observed. Explain how it is possible.
Fill in the blank:
The pollen grains represent the ________.
Once the pollen reaches the stigma, the pollen tube traverses down the ________ to the ovary where fertilization occurs.
Fill in the blanks:
The ______ are coloured to attract the insects that carry the pollen. Some flowers also produce ______ or ______ that attracts insects.
The polyembryony commonly occurs in ______.
In case of polyembryony, if an embryo develops from the synergid and another from the nucellus which is haploid and which is diploid?
What is pollen grain?
The plant part which consists of two generations, one within the other-
- Pollen grains inside the anther.
- Germinated pollen grain with two male gametes.
- Seed inside the fruit.
- Embryo sac inside the ovule
Choose the correct option.
