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(i) Pitcher plant contains chlorophyll; hence it is capable of preparing its own food. Pitcher plant grows in swamps or bog areas where the soil is deficient in nitrogen mineral. So, just to fulfil its nitrogen requirement it traps the insects and utilize their proteins. For this reason it is called as parasitic plant. Pitcher plant can live without insects also but it would be healthier if traps and digests insects. In true sense, insectivorous plants are partially autotrophic and partially parasitic.

(ii)?Photosynthesis can take place in normal light. However, the rate of photosynthesis in any normal light will be very low as compared to that in sunlight because sunlight has greater intensity. ?Sunlight is very important for photosynthesis. Photosynthesis occurs when green plants absorb sunlight and use it to convert carbon-dioxide and water into carbohydrates and oxygen in presence of chlorophyll. Chlorophyll is a plant pigment responsible for photosynthesis, gets excited in presence of sunlight. Chlorophyll traps sunlight of certain wavelength which is then used to excite the electrons.??



1. The plants which are nourished themselves with the food prepared by themselves are called autotrophs.

2. They contain chloroplast in their cells.

3. They include all green plants which are capable of performing photosynthesis.



1. The Plants, which are incapable of synthesizing their own food and depend on other plants for their nourishment are called heterotrophs.

2. They do not contain chloroplasts in their cells.

3. They include fungi and other non-green plants which may be parasites and saprophytes. They draw their nourishment form living hosts or from dead and decaying organisms.

(b)?Saprotrophic mode of nutrition is one in which organisms like fungi, feed upon dead and decaying plants and animals.?

Symbiotic relationship is defined as the mutually dependent relationship between two or more different organisms. In this relationship the organisms share substances between themselves.?For example: lichens is a symbiotic relationship between fungi and algae..?Each species or partner interacting in a particular symbiotic relationship is called the symbiont.
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