1. Differentiate between self pollination and cross pollination.
2. Why are rose flowers brightly-coloured and produce nectar?
3. What is a fruit? Write its functions.
4. Why do some fruits have hooks and spines?
5. What is the aleurone layer? How is it different from endosperm?
Answers
Answer:
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Answer:
1) Self-pollination:- occurs when the pollen from the anther is deposited on the stigma of the same flower, or another flower on the same plant.
Cross-pollination:- is the transfer of pollen from the anther of one flower to the stigma of another flower on a different individual of the same species.
2) Most of the flowers are brightly colored with a sweet smell called nectar because these things attract the insects so that insects come and sit on them. In this way the pollens fall on the insect and helps in pollination.
3) fruit:- the sweet and fleshy product of a tree or other plant that contains seed and can be eaten as food.
Function of a fruit:- prevent the seeds from drying and to disperse the seed.
4) Hooks and spines help the seeds to attach themselves to the furs or coats of animals and then travel long distances. This helps the seeds to be dispersed far and wide where they may sometimes find the right weather and conditions to germinate.
5) The aleurone layer surrounds the endosperm tissue of grass seeds and is morphologically and biochemically distinct from it. Starchy endosperm cells are large, irregularly shaped cells and contain starch grains while aleurone cells are cuboidal in shape and contain aleurone grains.
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