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प्रश्न
State significance of pollination.
What is the significance of pollination?
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उत्तर
Significance of pollination:
- Pollination is a significant event because it precedes fertilization.
- It brings the two types of gametes closer for the process of fertilization.
- Also, cross-pollination introduces variations in the plants due to the mixing of different genes which increases adaptability towards the environment or surroundings.
- Fertilization thereby results in the formation of fruits and seeds. Without pollination, there wouldn't be any fruit and seed formation.
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संबंधित प्रश्न
You are asked by your teacher to study the different parts of an embryo of a gram seed. Given below are the steps to be followed for the experiment:
I. Soak the gram seeds in plain water and keep them overnight.
II. Cut open a soaked seed and observe its different parts.
III. Take some dry gram seeds in a petri dish.
IV. Drain the excess water.
V. Cover the soaked seeds with a wet cotton cloth and leave them for a day.
The correct sequence of these steps is :
(A) III, I, V, IV, II
(B) III, I, II, IV, V
(C) III, IV, V, I, II
(D) III, I, IV, V, II
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 part of a seed which grows and develops into root on germination is :
(a) cotyledon
(b) plumule
(c) follicle
(d) radicle
Identify A, B, C and D in the given diagram and write their names.
What is phototropism?
Draw a diagram of the longitudinal section of a flower and label the following parts.
Which of the following are the chemical components of the wall of pollen tube?
The 3-celled egg apparatus at the micropylar end comprises of ______
Variations occur as a result of ______
The number of pollen sacs in a dithecous anther is ______.
