Out of following plants, which one is not browsed by cattle:

The correct answer is Option (4) → Calotropis

Option (1) Wheat — Browsed by cattle. Wheat plants are grazed readily.

Option (2) Cowpea — Browsed by cattle. Cowpea is grown as a fodder crop too.

Option (3) Sugar cane — Browsed by cattle. Its leaves and tops are eaten by cattle.

Option (4) Calotropis — Not browsed by cattle. This weed makes poisonous cardiac glycosides, a chemical defence against herbivores.

NCERT Extract:
Population Interactions – “… Many plants produce and store chemicals that make the herbivore sick when they are eaten, inhibit feeding or digestion, disrupt its reproduction or even kill it. You must have seen the weed Calotropis growing in abandoned fields. The plant produces highly poisonous cardiac glycosides and that is why you never see any cattle or goats browsing on this plant.”