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Modes of nutrition in Amoeba - Life Processes Video Lecture - Class 10

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1. What are the different modes of nutrition in Amoeba?

Ans. Amoeba exhibits two modes of nutrition: holozoic and saprophytic. In holozoic nutrition, Amoeba engulfs and ingests food particles, such as algae or small organisms, by forming temporary finger-like projections called pseudopodia. In saprophytic nutrition, Amoeba absorbs nutrients from dead organic matter, such as decaying plants or animals, through its cell membrane.

2. How does Amoeba obtain nutrition through holozoic mode?

Ans. Through holozoic nutrition, Amoeba captures its prey by extending pseudopodia around it and engulfing it into its cell. Once inside the cell, the prey is enclosed in a food vacuole. Digestive enzymes are then secreted into the food vacuole to break down the prey into simpler molecules. The nutrients are absorbed into the cytoplasm, while the undigested waste is eliminated through exocytosis.

3. What is the process of saprophytic nutrition in Amoeba?

Ans. In saprophytic nutrition, Amoeba obtains nutrients from dead organic matter. It releases digestive enzymes onto the decaying organic material, breaking it down into simpler molecules. These molecules are then absorbed through the cell membrane into the cytoplasm of Amoeba. This mode of nutrition is commonly observed when Amoeba comes across dead plants or animals.

4. Can Amoeba switch between different modes of nutrition?

Ans. Yes, Amoeba can switch between different modes of nutrition depending on the availability of food sources. When there is an abundant supply of living organisms, Amoeba primarily relies on holozoic nutrition to capture and consume its prey. However, in the absence of live organisms, it can resort to saprophytic nutrition by feeding on dead organic matter.

5. How does Amoeba adapt its feeding behavior to different environments?

Ans. Amoeba is a highly adaptable organism and can adjust its feeding behavior according to its environment. In environments with a sufficient supply of living organisms, Amoeba extends pseudopodia to capture and consume its prey through holozoic nutrition. However, in environments where live organisms are scarce, Amoeba can survive by feeding on decaying organic matter through saprophytic nutrition. This adaptability allows Amoeba to obtain nutrition in various habitats.

Text Transcript from Video

mode of nutrition in amoeba
amoeba is a unicellular microscopic
organism it has a unique mode of
nutrition
ameba comes very close to a food
particle it extends a part of its body
around the food particle this extended
part is called false feet or pseudopodia
the pseudopodia surrounds the food
particle completely
the ends of the pseudopodia fuse to form
a food vacuole
the food particle is trapped inside the
food vacuole
some digestive enzymes are secreted that
digests the food particle
the digested food is absorbed by the
cytoplasm
the undigested and unabsorbed substances
are removed from the body by temporary
vacuole

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Nov 24, 2024 Last updated

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