Question

Which of the following is the effect of a plant hormone, which is synthesised more in absence of light?

• A. Inhibits the development of seedless fruits
• B. Responsible for closing of stomata
• C. Induces the dormancy of seeds
• D. Length of intenodes increases

Answer 1

Answer: (D)

Length of intenodes increases

Gibberellins are the plant hormone causing light inhibited stem growth, this shows that light lowers the level of endogenous gibberellins and stem growth, while in dark it reverses. Gibberellins also produce some other physiological effects on plants like elongation of internodes and the stem, induce seed germination, breaking dormancy, induce parthenocarpy and maleness in plants, etc. Thus the correct answer is option D.