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प्रश्न
Explain what you understand by sexual reproduction.
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उत्तर
- Sexual reproduction requires two parents, one male and the other female. The male parent generates the male gamete or sex cell (sperm), whereas the female parent produces the female gamete or egg cell (ovum).
- When sperm and egg cells merge, they generate a third cell called the zygote. Fertilisation is the process by which sperm and egg cells fuse and produce a zygote.
- The zygote is the starting cell of a new creature. It grows into a complete creature throughout time. Sexual reproduction in flowering plants happens through the generation of seeds. Flowers are the primary organs involved in plant sexual reproduction.
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संबंधित प्रश्न
What is pollination?
A student while observing an embryo of a pea seed in the laboratory listed various parts of the embryo as given below:
Testa, Tegmen, Radicle, Plumule, Micropyle, Cotyledon.
On examining the list the teacher remarked that only three parts are correct. Select three correct parts from the above list:
(a) Testa, Radicle, Cotyleddon
(b) Tegmen, Radicle, Micropyle
(c) Cotyledon, Plumule, Testa
(d) Radicle, Cotyledon, Plumule
A student has to perform the experiment "To identify the different parts of an embryo of a dicot seed." Select from the following an appropriate group of seeds:
(a) Pea, gram, wheat
(b) Red kidney bean, maize, gram
(c) Maize, wheat, red kidney bean
(d) Red kidney bean, pea, gram
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
Name the male part of the flower.
Where is the female gamete formed in flowering plants?
Which among the following statements are true for unisexual flowers?
(i) They possess both stamen and pistil
(ii) They possess either stamen or pistil
(iii) They exhibit cross pollination
(iv) Unisexual flower possessing only stamens cannot produce fruits
(a) (i) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (i), (iii) and (iv)
In a bisexual flower, inspite of the young stamens being removed artificially, the flower produces fruit. Explain.
Draw a diagram of a pistil showing pollen tube growth into the ovule and label the following:
Pollen grain, male gamete, female gamete, ovary.
Give scientific reason.
Fertilization in plants is called double fertilization.
