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Vernalization refers to the process of promoting early flowering in plants by exposing their seeds to cold temperatures. Which of the following statements is correct?

1. Tendrils coil due to thigmotropism, which is a response triggered by physical contact with an object.
2. Thigmotropism is influenced by the plant hormone auxin. When cells are touched, auxin is redistributed to untouched cells, causing them to grow faster and bend toward the stimulus. Ethylene also plays a role by altering cell shape or turgidity.
3. In the absence of light, stems grow excessively long due to a phenomenon called 'etiolation,' where the internode cells elongate.
4. Refer to the explanation provided in Answer 42.

Correct answer: In the absence of light, stems grow excessively long due to a phenomenon called 'etiolation,' where the internode cells elongate.

Solution

The correct statement describes etiolation: in darkness, seedlings often become pale and elongated because internodes stretch to search for light. The other choices discuss thigmotropism, which is a touch response, not the phenomenon asked for here.

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