Question : Movement of hairs in Drosera is referred to as
Option 1: Heliotropism
Option 2: Thigmotropism
Option 3: Photonastic
Option 4: Seismonastic
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Correct Answer: Thigmotropism
Solution : The correct option is Thigmotropism.
The movement of hairs in plants such as Drosera (commonly known as sundews) in reaction to human touch or contact is known as "thigmotropism." Thigmotropism is a form of tropism, which is the growth response of a plant to a stimulus. The stimulus in the case of thigmotropism is physical touch or mechanical disruption. Thigmotropism is frequently noticed in sundews as the plant's specialised glandular hairs that are wrapped with sticky chemicals to trap and devour insects.
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