Which among the following are plant hormones?
(A) Auxin
(B) Gibberellins
(C) Oestrogen
(D) Abscisic acid
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A), (B) and (D) only
Plant hormones (phytohormones) are chemicals made in small amounts in plants that control growth and development. The five main groups are auxins, gibberellins, cytokinins, ethylene and abscisic acid.
(A) Auxin Correct. Auxin is made at the shoot tip and promotes cell elongation; it makes a shoot bend towards light.
(B) Gibberellins Correct. Gibberellins make the shoot grow longer and help seeds germinate.
(C) Oestrogen Incorrect. Oestrogen is an animal hormone, the female sex hormone made by the ovaries.
(D) Abscisic acid Correct. Abscisic acid is a growth-inhibiting plant hormone; it keeps seeds dormant and closes stomata when water is short.