Phototropism of stem and root are due to

Differential hormonal effect

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Solution

The correct option is A Differential hormonal effect
Phototropism in stem and root are due to differential phytohormonal effect. Stem grows positively phototropic. Roots grow negatively geotropic. Auxin is responsible for apical dominance and positive phototropism by stem.

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Similar questions

Identify the incorrect statements from the following

1. Young stem of vine plant show positive phototropism and positive thigmotropism

2. Sunflower position itself facing the sun is showing positive response to heat generated due to exposure to sunlight

3. Roots show negative thigmotropism and positive hydrotropism

4. Roots show positive chemotropism to some chemical and negative chemotropism to some other chemicals

Which of the following plant part exhibits negative phototropism ?

(a) root

(b) branch

(d) stem

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