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प्रश्न
The bending of the stem of a plant towards a source of light is caused by the action of a phytohormone known as :
(a) abscisic acid
(b) auxin
(c) gibberellins
(d) cytokinin
उत्तर
(b) auxin
Auxin causes phototropism, i.e., bending of plant stems towards the source of light.
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संबंधित प्रश्न
Where is the auxin hormone made in a plant stem?
Give the scientific terms used to represent the Bending of a shoot towards light.
Give the scientific terms used to represent the Growing of roots towards the earth.
Give one example of a plant part which is positively hydrotropic as well as positively geotropic.
The climbing organs of plants like tendrils grow towards any support which they happen to touch and wind around the support. This is an example of :
(a) chemotropism
(b) nastic movement
(c) thigmotropism
(d) geotropism
The stimulus in the process of thigmotropism is:
What is a tropic movement? Explain with an example.
Analogy:
Towards a stimulus: ______:: Away from the stimulus: Negative tropism.
When the leaves of the Mimosa pudica plant are touched with a finger, they fold up quickly.
Name a hormone which is responsible for phototropism
