Question

What is the most important external stimulus needed for a plant to carry out
photosynthesis?
A. Sunlight
B. Soil
C. Fertilizer
D. Warmth

Answer 1

Answer:

A. Sunlight

Explanation:

The chlorophyll in plant cells abosrb sunlight to photosynthesise. It is needed because all energy on earth comes from the sun. Energy is never created or lost, it simply changes forms.