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प्रश्न
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 one way in which the above two processes are similar.
उत्तर
Both processes are similar as the response is not determined by the direction of the stimulus. They are the nastic movement.
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संबंधित प्रश्न
Give the scientific terms used to represent the Bending of roots towards water.
Name the plant organ which is positively phototropic.
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
Dandelion flowers open the petals in bright light during the daytime but close the petals in dark at night. This response of dandelion flowers to light is called:
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.
Differentiate between:
Phototropism and chemotropism
What is the difference between movement of flower in sunflower plant and closing of the leaves in the Mimosa pudica?
The leaves of Mimosa are sensitive to ____________.
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.
