Give reason for the following –
(a) Some plants eat insects.
(b) Soil needs to be replenished.
(c) Mistle toe is regarded as a partial parasite.
Answers
Answer:
(a) Insectivorous plants trap insects because they grow in soil which is usually thin and is also poor in nutrient. So for making themselves rich in nutrients they eat insects. Some pitcher plants contain mutualistic insect larvae, which feed on trapped prey, and whose excreta the plant absorbs.
(b) It is necessary to replenish the nutrients into the soil because all the nutrients that soil has are used up by the plants during their growth so for the continuos supply of nutrients to the plants it is necessary to replenish the soil again and again.
(c) Mistletoe is a parasite – it steals water and nutrients from trees.Most mistletoe seeds are spread by birds, which eat the berries and defecate on tree branches. If attached to a new host tree, the parasitic seed releases a compound called “viscin”, which dries to form a stiff biological cement.
Answer:
A- Venus Flytrap, Pitcher plant, Sundew
B- some nutrients of the soil get depleted by the growing of same crop year after year . So replenishment of soil is essential to keep it fit for further cultivation .
C- The Mistletoe is dependent on a tiny bird called a flowerpecker to disperse it seeds. This makes a mistletoe a partial parasite .
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