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प्रश्न
What is pollination? How does pollination occur?
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उत्तर
Pollination is the transfer of pollen grains from the stamen to the stigma of the pistil. Pollination occurs when pollen grains are carried from the anther to the stigma by insects, birds, wind or water.
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संबंधित प्रश्न
Explain what you understand by sexual reproduction.
The reproductive part of a plant is the ______.
Explain the term 'fertilisation'.
What is seed? What are the parts of a seed? Explain with the help of a labelled diagram.
Name the part of a seed which contains stored food.
The part of a seed which grows and develops into root on germination is :
(a) cotyledon
(b) plumule
(c) follicle
(d) radicle
Write one main difference between asexual and sexual mode of reproduction. Which species is likely to have comparatively better chances of survival – the one reproducing asexually or the one reproducing sexually? Give reason to justify your answer.
You have to perform the experiment, "To identify the different parts of an embryo of a gram seed." Describe the procedure that you would follow.
Draw a diagram of the longitudinal section of a flower exhibiting germination of pollen on stigma and label (i) ovary, (ii) male germ-cell, (iii) female germ-cell and (iv) ovule on it.
In the figure, the parts marked A, B and C are sequentially:
(A) Plumule, Radicle and Cotyledon
(B) Radicle, Plumule and Cotyledon
(C) Plumule, Cotyledon and Radicle
(D) Radicle, Cotyledon and Plumule
Draw a diagram of the longitudinal section of a flower and label on it sepal, petal, ovary and stigma.
Identify the odd. Stigma, Style, Pollen, Ovary.
Pollen grains are formed by _________ division in locules of anthers.
Define.
Inflorescence
In which part of the flower germination of pollen grains takes place?
Gloriosa superba exhibits ______.
Pineapple fruit develops from ______.
The ovaries of different flowers may contain ______.
Trace the path a male gamete takes to fertilise a female gamete after being released from the penis.
- Assertion: Primary endosperm nucleus is diploid.
- Reason: It is the product of double fertilisation.
