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प्रश्न
How does the process of fertilisation take place in flowers?
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उत्तर
- When pollen lands on the stigma, it germinates and gives rise to a pollen tube that passes through the style and reaches the ovary of a pistil.
- When the pollen tube reaches an ovule, it releases the male gametes. A male gamete fuses with a female gamete in the ovule.
- This process is known as fertilisation. The cell which is formed after the fusion of a male and a female gamete is known as zygote.
- This zygote divides several times in order to form the embryo present inside the seed.
Process of fertilisation
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संबंधित प्रश्न
A student was asked to observe and identify the various parts of an embryo of a red kidney bean seed. He identified the parts and listed them as under:
I. Tegmen
II. Testa
III. Cotyledon
IV. Radicle
V. Plumule
The correctly identified parts among these are
(A) I, II and III
(B) II, III and IV
(C) III, IV and V
(D) I, III, IV and V
(i) Name the part marked 'A' in the diagram.
(ii) How dose 'A' reachese part 'B'?
(iii) State the importance of the part 'C'.
(iv) What happens to the part marked 'D' after fertilisation is over?
Name the parts A, B and C shown in the following diagram and state one function of each.
In tobacco plant, the male gametes have 24 chromosomes.
What is the number of chromosomes in the female gamete?
Put a tick mark (✓) against the correct alternative in the following statement
Pollen is produced in the:
What is a flower ? Draw a neat labelled diagram showing the L.S. of a typical flower.
“Cell division is a type of reproduction in unicellular organism.” Justify.
Write the names of male and female reproductive parts of a flower.
Distinguish between self-pollination and cross-pollination.
Type of sexual reproduction is ______.
