Advertisements
Advertisements
प्रश्न
Name the part of plant which shows positive geotropism. Why?
उत्तर
Root shows positive geotropism because of the unidirectional movement in response to gravity.
APPEARS IN
संबंधित प्रश्न
Define geotropism.
Which of the following is not caused by a growth movement?
The chemical substance P is made and secreted by the meristematic tissue at the tip of stem (or shoot) of a plant. The chemical substance P is responsible for a phenomenon Q in plants in which the stem bends towards a source of light. The same chemical substance P has an opposite effect on the root of a plant. It causes the root of a plant to bend away from the source of light in a process called R.
(a) What is the chemical substance P?
(b) State whether P prefers to remains in the sunlit side of a stem or in shade.
(c) What is the effect of substance P on the rate of growth of (i) a root, and (ii) a stem?
(d) What is the name of process (i) Q, and (ii) R?
(e) What is the general name of chemical substances like P? Name another substance which belongs to this class of chemical substances.
How is movement in plants different from that in animals?
The leaves of Mimosa are sensitive to ____________.
Assertion: Plants do have a nervous system for control and coordination.
Reason: Plants use electrochemical means to convey information from cell to cell.
Give an example for the movement of plant part which is very quick and can be observed easily.
Why do roots of halophytes show negative geotropism?
The height of a plant is regulated by ______.
Give one example of geotropism.
