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Earn 100

Is photonasty a growth-related movement?

Important Questions on Control and Coordination

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The changes that are likely to happen in the plant in the following picture:

Question Image

(A) A hormone abscisic acid is synthesised at the shoot tip.

(B) When light is coming from one side of the plant, auxin diffuses towards the shady side of the plant.

(C) Abscisic acid helps the cells to grow longer.

(D) Cells grow longer on the side of the shoot which is away from light.

Select the correct option.

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What is hydrotropism? Design an experiment to demonstrate this phenomenon. 
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Fill in the blank with the options provided in the bracket.

Plant shoot grows upward in response to _____ (water, touch, light).

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_____ are chemical substances controlling and coordinating plant responses.
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The _____ hormone causes phototropism in plants.
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A plant’s response to light is called _____.
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A plant root grows downward, in response to _____.
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Tendrils wind around a support in response to _____. (touch/ pressure/ chemical)
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Plant hormones are known as _____.
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In plants, _____ are mainly responsible for cell elongation in stems.
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The type of tropism exhibited by sunflowers is called _____. (hydrotropism/chemotropism/heliotropism)
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When plants are exposed to unidirectional light then more growth takes place in the _____ (brighter/darker) side of their stem.
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_____ movements are also known as sleep movements.
MEDIUM

Fill in the blank with the correct option provided in the bracket.

Tendrils wind around a support in response to _____(touch, pressure, chemical).

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A plant’s response to gravity is called _____.
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_____ is the hormone that helps in cell division in plants.
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Fill in the blank with the correct option provided in the bracket.

Accumulation of _____ (abscisic acid/auxin/ethylene) in seeds makes them dormant.

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The response of leaves to the sunlight is called as_____. (chemo-tropism/ phototropism/ geotropism/ semimonastic movement)
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Give an example for: A plant that responds when touched: _____ (Sundew/Touch-me-not/Pitcher plant)
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The process of growth of the plant in response to light is known as _____.