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प्रश्न
The bending of root of a plant in response to water is called ______.
पर्याय
Thigmonasty
Phototropism
Hydrotropism
Photonasty
उत्तर
The bending of root of a plant in response to water is called Hydrotropism.
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संबंधित प्रश्न
Where is the auxin hormone made in a plant stem?
What does a stem (or shoot) do in response to light? What is this phenomenon known as?
Name the plant part which bends in the direction of gravity but away from light.
What is meant by 'tropisms' (or tropic movements)? Explain with an example.
A potted plant is growing in a transparent glass jar. In this plant, X and Y are the two growing parts having a lot of meristematic tissue. It is observed that the part X of this plant exhibits positive geotropism but negative phototropism. On the other hand, part Y of this plant exhibits negative geotropism but positive phototropism.
(a) Name the part X of plant.
(b) Name the part Y of plant.
(c) Which part of the plant, X or Y, will exhibit positive hydrotropism?
(d) Which part of the plant, X or Y, can have tendrils on it?
(e) Which phytohormone causes the part X to exhibit negative phototropism?
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.
State whether true or false. If false, correct the statement.
Shoot is positively phototropic and negatively geotropic.
Differentiate phototropism from photonasty.
Name the stimulus which causes the following movement in plant:
Geotropism
Define the following term:
Tropism
