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प्रश्न
Give one example of geotropism.
उत्तर
The growth of plant roots is an example of geotropism.
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संबंधित प्रश्न
What is the scientific name of sensitive plant?
Give the scientific terms used to represent the Bending of roots towards water.
Plant parts show two types of movements, one dependent on growth and other independent of growth. Give one example which does not depend on growth
Tendrils wind around a support in response to ______.
The root of a plant grows downward. This is known as ______.
One of the following plant hormones is responsible for the phenomenon of phototropism in plants. This is :
(a) gibberellin
(b) eltroxin
(c) cytokinin
(d) auxin
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.
When the leaves of a sensitive plant are touched with a finger, they fold up and when light fades at dusk, the petals of a dandelion flower close.
state two ways in which the above two processes differ.
Assertion (A): If the plant part moves in the direction of gravity, it is called positive geotropism.
Reason (R): Stem shows positive geotropism.
Ali has some pea plants in his garden which need a support to grow as seen in the picture given below:
- Name the phenomenon depicted by the shoot in the given figure.
- Define the above phenomenon.
- Write the name of the part marked X.
