Which of the following is plant hormones?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Cytokinin
Plant hormones (phytohormones) are chemicals made in small amounts in plants that control their growth. The main groups are auxins, gibberellins, cytokinins, abscisic acid and ethylene.
Cytokinins promote cell division. They are found where cells divide fast, such as root tips, young fruits and seeds, and they also delay the ageing of leaves.
Why the other options are incorrect
Option (1) Insulin — Incorrect. It is an animal hormone made by the pancreas that lowers the blood sugar level.
Option (2) Thyroxin — Incorrect. It is made by the thyroid gland and controls the rate of metabolism in the body.
Option (3) Oestrogen — Incorrect. It is a female sex hormone made by the ovaries.