Phototropism Movement


 
 
Concept Explanation
 

Phototropism Movement

It  is the tropic response of organisms to light. When a young green plant receives light from one direction only, the stem grows towards the light source. The stem is said to be positively phototropic because the stem tip grows in the direction of light. Sunflower buds exhibit a special type of phototropism in which the buds turn slowly through the day so that they always face the sun. This movement is caused by turgor changes.

How phototropism occurs ?

It is the directional movement of a plant in response to light. The shoot responds by bending towards light and roots respond by bending away from light. This happens as;

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Sample Questions
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Question : 1

Phototropic movements of roots and stems are due to ______________

Right Option : C
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Question : 2

The movement of root in response to the light is called as 

Right Option : A
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Question : 3

The effect of daily light period on flowering is called___________________

Right Option : B
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Explanation
 
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