Phototropism is the response of parts of a plant towards a source of___ .

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Solution

Phototropism is the response of parts of a plant towards a source of light. The growth towards a light source is called positive phototropism, while growth away from light is called negative phototropism.

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Q. Phototropism is movement of plant part in response to:

Match the following:

$\begin{matrix} A & B (1) Growth of sunflower towards a light source & (i) Chemotropism (2) Growth of tree roots towards earth & (ii) Hydrotropism (3) Growth of plant roots towards or away from moisture & (iii) Phototropism (4) Growth of a plant part in response to a chemical stimulus & (iv) Geotropism \end{matrix}$

The response of a plant to the changing relative length of the day and night is called phototropism.

Response of a plant to the changing relative length of the day and night is called phototropism.

Q. Growth towards a light source is called positive phototropism.

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