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प्रश्न
The bending of the shoot of a plant in response to light is called :
(a) geotropism
(b) phototropism
(c) thigmotropism
(d) photonasty
उत्तर
(b) phototropism
Photo means light and tropism means movement. The bending of plant shoots in response to light is called phototropism.
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संबंधित प्रश्न
A plant's response to gravity is called ______.
How does phototropism occur in a plant stem (or shoot)? Explain with the help of labelled diagrams.
Define geotropism.
What is the difference between thigmotropism and thigmonasty? Name one plant which exhibits thigmotropism and one plant which exhibits thigmonasty. What behaviour (or responses) of these plants make you think that they exhibit thigmotropism and thigmonasty respectively?
The growth of tendrils in pea plants is due to the :
(a) effect of sunlight on the tendril cells facing the sun
(b) effect of gravity on the part of tendril hanging down towards the earth
(c) rapid cell division and elongation in tendril cells that are away from the support
(d) rapid cell division and elongation in tendril cells in contact with the support
The growth movement of a plant part in response to the touch of an object is called :
(a) thigmonasty
(b) hydrotropism
(c) thigmotropism
(d) geotropism
______ flowers bloom as the temperature increases.
Why do roots of halophytes show negative geotropism?
Name a plant hormone responsible for bending of a shoot of a plant when it is exposed to unidirectional light. How does is promote phototropism?
______ of sweet peas exhibit thigmotropism.
