NEET BIOLOGY

Detailed explanation-1: -The seed of these plants catches on the fur of animals and are carried away to different places, far from their parent plants. Dates, rambutan, sea grapes, sea holly, tamarind, raspberry, sunflower, tomatoes are a few examples of plants whose seeds are dispersed by animals and birds.

Detailed explanation-2: -Xanthium seeds are produced inside a hard, spiny, double-chambered, single-seeded bur which is 0.8 to 2.01 cm long. As the seed is covered with stiff spines that are hooked, they stick to the fur of animals.

Detailed explanation-3: -Some seeds have hooks or barbs that catch onto an animal’s fur, feathers or skin. Plants like pittosporum have sticky seeds that can be carried away by birds. Humans can also spread seeds if they get stuck to our clothing or shoes – and if we throw fruit pips and stones out of the car window!

Detailed explanation-4: -The hooked spines attach easily to the skin, fur, or even feathers of passing animals, which then transport the seeds whither the animals wander. When eventually the animals rub the burrs off their coats, the seeds separate and disperse to the soil.