2017 · Q26
The plant growth regulators are small simple molecules of diverse chemical composition. They are
General KnowledgeBiology
- Acarbohydrates, fats and proteins
- Bindole compounds, adenine derivatives, carotenoids and terpenes
- Cfatty acids, glucose and vitamins
- Dvitamin C, vitamin D and glucose
Explanation
Plant growth regulators fall into exactly these chemical classes: auxins are indole compounds, cytokinins are adenine derivatives, gibberellins are terpenes (diterpenes), and abscisic acid is a carotenoid derivative. They are not carbohydrates, fats, proteins, or vitamins. Hence B.