Modes of Nutrition in Plants
The mode of nutrition in plants are as under:
Parasitic Plants:
- i) These plants cannot prepare their own food.
- ii) They depend on host.
iii) They have special roots called haustoria, which penetrate into vascular bundles of host and draw food material.
- iv) Dodder plant is an example of them.
Saprophytic Plants:
- i) These plants cannot prepare their own food.
- ii) They draw their food from decomposed matter of the dead remains of animals and plants.
iii) Their examples are Neottia and Monotropa.
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Insectivorous Plants:
- i) These plants can prepare their own food.
- ii) They grow on marshy places.
iii) They also capture small insects as food.
- iv) Their examples are Pitcher plant bladderwort and Venus flytrap etc.
Symbiosis:
- i) It is mutually beneficially association present between two plants.
- ii) Both organisms derive benefits from each other.
iii) Their examples are grams, peas and beans.
The advantages of this school include the following: ยท Economic thought developed on a more mature methodological basis. The classics substantiated and used general philosophical, special methods and techniques of research; ยท The analysis was transferred to the sphere of production and the mechanism of functioning of a simple commodity and market economy was investigated; ยท Formed the categorical apparatus of economic science; ยท The functional role, subject and object of political economy have been determined