Explain any three types of heterotrophic nutrition in plants with example. 7th class
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Answer:
Explanation:
Heterotrophic Nutrition:
It is a mode of nutrition in which the organisms obtain readymade organic food from outside sources. The organisms that depend upon outside sources for obtaining organic nutritens are called heterotrophs. Heterotrophic nutrition is of three types - saprophytic, parasitic and holozoic.
Saprophytic or Saprotrophic Nutrition:
It is a mode of heterotrophic nutrition in which food is obtained from organic remains like dead organisms, excreta, fallen leaves, broken twigs, food articles, etc. Organisms performing saprophytic nutrition are called saprophytes.
Parasitic Nutrition:
It is a mode of hetrotrophic nutrition in which a living organisms flourishes by obtaining food from another living organism. The lving organisms which obtains food and shelter from another organism is called parasite. The organism which provides food and shelter to a parasite is known as host. An external plant parasite is Cuscuta (Amarbel). It is a non-green plant that sends haustroria or sucking roots into host plant for obtaining food and water.
Parasitic Plants
A parasitic plant is one that partially or completely depends on another plant (called host) for nutrition.
Usually, parasitic plants develop special roots, which penetrate into the tissues of the host plant. The prepared food is generally absorbed from the root or the stem of the host plant. Some examples are Cuscuta (dodder) and mistletoe.
The slender leaves of bladderworts bear a large number of very small, pear-shaped bladder structures, which act like trapdoors and suck in small insects in less than a second.
Answer:
Heterotrophic nutrition is a mode of nutrition where organisms directly or indirectly depend on autotrophs for food. They are called as Heterotrophs. They cannot prepare their own food. Protoctists and prokaryotes are examples of heterotrophic nutrition.
Types of Heterotrophic Nutrition
In nature, organisms exhibit various types of heterotrophic nutrition. They are as follows:
-Saprophytic nutrition: In this mode of nutrition, organisms obtain nutrients from dead and decaying organic matter. These organisms are called Saprophytes. Example: Yeast.
-Parasitic nutrition: In this mode, the organism lives inside or outside the body of another organism. It takes nutrition from the other organism without killing it. Such organisms are called parasites. Example: Ascaris (roundworm) are parasites on the human body.
-Holozoic nutrition: Organisms which show holozoic nutrition feed on complex matter. This matter is digested and nutrients are absorbed. Example: Human beings
Explanation:
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