Question

Which of the following statements are correct?
a. Cytokinins suppress the synthesis of chlorophyll.
b. Auxins control apical dominance.
c. Gibberellins promote shoot elongation.
d. Abscisic acid enables the seeds to withstand desiccation.

• A. a and b only
• B. b and c only
• C. a and c only
• D. b, c and d only
• E. c and d only

Answer 1

Answer: (D)

b, c and d only

• Auxins are plant hormones that promote apical dominance. It also promotes root and shoots elongation.
• Cytokinins are involved primarily in cell growth and differentiation also affects axillary bud growth and leaf senescence.
• Gibberellins promote shoot elongation. It also causes bolting, which is the increase of shoot length.
• Abscisic acid is a phytohormone that enables seeds to withstand desiccation. Abscisic acid also promotes dormancy.

Thus, the correct answer is option D.