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प्रश्न
Describe an activity to demonstrate phototropism.
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उत्तर
To demonstrate phototropism in plants a sunflower plant is taken and kept in sunlight. It will be observed that the flower head of sunflower will move from east to west along with the movement of Sun. This shows that the flower head of sunflower is positively phototropic and moves in response to sunlight stimulus.
संबंधित प्रश्न
(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 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
Fill in the following blank with suitable word :
The ovule becomes a .......... after fertilisation.
Name the part of a seed which grows into root.
What is pollination? How does pollination occur?
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?
State whether the following statement is true (T) or false (F):
Flowers which possess stamens and carpel are called unisexual.
What is meant by pollination?
Define.
Inflorescence
What does germination mean?
