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प्रश्न
Plant roots grow downward in response to ______.
उत्तर
Plant roots grow downward in response to gravity.
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संबंधित प्रश्न
A potted plant is kept horizontally for a considerable time. The three positions of the parts A and B of the potted plant are shown in the following figures:
- Which figure shows the correct position taken by the parts A and B of the plant?
- What type of phenomenon is exhibited by the figure chosen in (a) above?
Name the plant organ which is positively hydrotropic.
The movement of a plant part in response to the force of attraction exerted by the earth is called :
(a) hydrotropism
(b) geotropism
(c) chemotropism
(d) phototropism
Which of the following is not caused by a growth movement?
P and Q are two types of plants having weak stems which cannot stand upright on their own. The plants P and Q have organs R and S respectively which can grow towards any support which they happen to touch and wind around that support. It is observed that organ R originates from the leaves of the plant whereas organ S originates directly from the stem of the plant.
(a) What is (i) R, and (ii) S?
(b) What is the name of growth movement exhibited by the organs R and S?
(c) Name the stimulus involved in this case.
(d) State whether the behaviour of organs R and S is a tropic movement or a nastic movement.
(e) Name one plant like P and another plant like Q.
With the help of an experiment, prove that roots are more positively hydrotropic than geotropic.
Plants take in carbondioxide for photosynthesis but need ______ for their living.
What is the difference between movement of flower in sunflower plant and closing of the leaves in the Mimosa pudica?
What is the other name for thigmonasty?
The growth movement of plant parts which occurs due to touch stimulus is called ______.
