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प्रश्न
List any two differences between pollination and fertilisation.
उत्तर
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Pollination |
Fertilization |
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Pollination is the transfer of pollen grains carrying male gametes from the anther to pistil of a flower. Pollination is of two types—self pollination and cross pollination. |
Fertilization is the fusion of male and female gamete to form a zygote. It is also of two types—internal fertilization and external fertilization. |
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Pollination occurs with the help of certain agents such as wind, water or animals |
Fertilization occurs after pollination when the pollen grain resides on stigma and forms a pollen tube to transfer the male gamete into the embryo sac in the ovary. |
APPEARS IN
संबंधित प्रश्न
Answer the following question.
State significance of pollination.
A student identified the various parts of an embryo of a gram seed and listed them as given below :
(I) Testa
(II) Plumule
(III) Radicle
(IV) Cotyledon
(V) Tegmen
Out of these the actual parts of the embryo are :
(A) I, II, III
(B) II, III, IV
(C) III, IV, V
(D) II, IV, V
Write the names of those parts of a flower which serve the same function as the following do in the animals :
(i) testis,
(ii) sperm,
(iii) ovary,
(iv) egg
What is seed? What are the parts of a seed? Explain with the help of a labelled diagram.
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.
Draw a diagram of a pistil showing pollen tube growth into the ovule and label the following:
Pollen grain, male gamete, female gamete, ovary.
What is meant by pollination?
What would be the number of chromosomes in the cells of the aleurone layer in a plant species with 8 chromosomes in its synergids?
Give reason for the following:
Fertilization cannot take place in flowers if pollination does not occur.
In flowering plants, the pollen grains are transferred to stigma by pollination but the female germ cells are present in the ovary.
Explain with the help of a labelled diagram (only concerned parts), how the male germ cell reaches the ovary.
