Question

Where do plants obtain most of their carbon and oxygen?

(a) From nitrates in the soil

(b) From ammonia in the soil

(c) From nitrogen in the atmosphere

(d) From carbon dioxide in the atmosphere

I had been asked this question in homework.

The question is from Mechanism of Absorption of Nutrients topic in chapter Mineral Nutrition of Biology – Class 11

Answer 1

The correct choice is (d) From carbon dioxide in the atmosphere

To explain: Plants obtain most of their carbon and most of their oxygen from CO2 in the atmosphere. However, their remaining nutritional requirements are obtained from water and minerals in the soil.