Plants exhibit phototropism, the growth of plant stems or roots toward or away from light. An experiment was conducted using chickpea or green gram seedlings in a dark box with a single hole for light entry, which demonstrated that after 3 hours the seedlings bent toward the direction of the light source, showing the principle of phototropism. For monocot seedlings it may take longer to observe this response due to the coleoptile structure.

1. 024 PHOTOTROPISM: RESPONSE OF PLANTS TO LIGHT
This experiment explains the principle of plants’ response to light
MATERIALS REQUIRED
Chick pea or green gram seedlings about 5 cm in height.
A dark box (old cardboard box) with a hole on only one side so that light enters
the box only through that hole.
Chick pea Green gram

2. Keep observing. After 3 hours, the seedlings bend towards the direction of
light showing phototopism. If you use monocots, it will take some time before
the plant bends towards light due to the coleoptiles.