Question

define heterotrophic mode of nutrition
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Answer 1

Answer:

Based on the source of nutrition, heterotrophic mode of nutrition can be divided 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

Answer 2

$\mathtt{\bf{\large{\underline {\red{Heterotrophic \: Nutrition:-}}}}}$

➯ The organism which cannot make their own food and depends directly or indirectly on autotrophs for their survival are called heterotrophs.

➯ For example :- Animals, Human beings, fungi, Mushroom.

➯ Heterotrophic nutrition refers to the process of obtaining food from the other organism for their own growth.

➯ Chlorophyll and sunlight are not required in this mode of nutrition.

➯ Heterotrophic nutrition are classified intro 3 types:-

i) Saprophytic nutrition

ii) Holozoic nutrition

iii) Parasitic nutrition

➯ Saprophytic nutrition :-

• In the saprophytic mode of nutrition, the organism obtains its nutrients from dead and decaying organic matter.

• For example :- Mushroom, spider, rhizopus.

➯ Holozoic nutrition :-

• In this mode of nutrition solid and complex organic food is directly taken into the body.

• This type of nutrition take place in 5 steps :- Ingestion, Digestion, Absorption, Assimilation and Excretion.

• For example :- Amoeba, vertebrates.

➯ Parasitic nutrition :-

• In this mode of nutrition some non green plants live in or on other living organism and derive their food from them.

• For example :- Dodder, lice, tapeworm.