While conducting experiments to study the effect of various stimuli on the plants, it was observed that the roots of a plant X grow and bend towards two stimuli A and B but bend away from a third stimulus C. The stem of the plant X, however, bends away from stimuli A and B but bends towards the stimulus C. The stimulus B is known to act on the roots due to too much weight of the earth. Keeping these points in mind, answer the following question (a) What could stimulus A be?
(b) Name the stimulus B.
(c) What could stimulus C be?
(d) The branches of a fallen tree in a forest grow straight up in response to two stimuli. What could be these two stimuli out of A, B and C? Also name these two stimuli.
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After recovering from infection of ringworm, Reena thought that all fungi are harmful for human kind, as these spoil food and cause various diseases. But her elder sister told him that not all fungi are harmful, some are quite useful such as in making bread, vitamins, Medicines (antibiotics) and in decomposing organic wastes.
(i) Name any fungus which is used in bread making.
(ii) Name any fungus which is the source of some medicine.
​(iii) What ecological benefit is shown by fungi?
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