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प्रश्न
Explain the term 'fertilisation'.
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उत्तर
Fertilisation is the fusion or union of male and female gametes to form a zygote.
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संबंधित प्रश्न
How does fertilisation occur in flowers? Name the parts of the flower that develop into (i) seed, and (ii) fruit after fertilisation.
(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?
A flower may have either male or female reproductive parts. Such a flower is called ______.
Draw a neat sketch of the carpel of a flower. Mark in it stigma, style and ovary.
Name the part of a seed which grows into shoot.
Which of the following statements are true for sexual reproduction in flowering plants?
(i) it requires two types of gametes
(ii) fertilisation is a compulsory event
(iii) it always results in the formation of zygote
(iv) offsprings formed are clones
(a) (i) and (iv)
(b) (i), (ii) and (iv)
(c) (i), (ii) and (iii)
(d) (ii), (iii) and (iv)
The flask-shaped organ A at the centre of a flower is surrounded by a number of little stalks B having swollen tops which lie just inside the ring of petals.
(a) Name A. What are the various parts of A?
(b) Which part of A contains gametes?
(c) Name B. What is the swollen top of B known as?
(d) What does the swollen top of b contain?
(e) Out of A and B, which one is (i) male part, and (ii) female part of the flower?
Fill in the blank by selecting suitable word:
A flower that bears both the male and the female parts is known as __________ flower.
Identify A, B, C and D in the given diagram and write their names.
Sketch the labeled diagram:
Flower with its sexual reproductive organs
Prepare a slogan for campaign against female foeticide.
Draw a diagram of the longitudinal section of a flower and label the following parts.
Define.
Inflorescence
Which of the following is the outermost protective layer of anther?
How many middle layers are generally present in the wall of the anther lobes?
Length of pollen tube depends on the distance between ______
Complete the table
| Carly x | ______ | ______ |
| ______ | petal | attract insects |
| Androecium | ______ | Male reproductive part |
| ______ | ______ | Female reproductive part. |
What is puberty?
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.
- Assertion: Primary endosperm nucleus is diploid.
- Reason: It is the product of double fertilisation.
