difference between autotrophic nutrition and heterotrophic nutrition for 3 marks
Answers
Answer:
autotrophic nutrition
the mode of nutrition in which an organism makes its own food is called autotrophic nutrition
heterotrophic nutrition
the mode of nutrition in which organism depends on other living organism for nutrition is called heterotrophic nutrition
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Answer:
Autotrophs
These are known as the producers and include green plants, algae and a few photosynthetic bacteria.
These can be classified as photoautotrophs and chemoautotrophs.
The chloroplast helps in preparing food.
They obtain energy from inorganic sources by converting light energy into chemical energy.
Autotrophs can store light energy and chemical energy.
They are placed at the primary level in the food chain.
These can move from one place to another in search of food and shelter.
Heterotrophs
Heterotrophs depend upon other organisms for nutrition.
These are the consumers and include cows, buffaloes, tigers, horses, etc.
These can be classified as photoheterotrophs and chemoheterotrophs.
They do not contain chloroplast so cannot prepare food.
They obtain energy directly or indirectly from other organisms.
Heterotrophs cannot store energy.
These are placed in secondary or tertiary level in the food chain
They cannot move from their place.
Explanation:
Autotrophs are organisms that prepare their own food through the process of photosynthesis, whereas, heterotrophs are organisms that cannot prepare their own food and depend upon autotrophs for nutrition.”
Autotrophs
Autotrophs are organisms that undergo autotrophic mode of nutrition. These are the organisms that can prepare their own food from simple substances like carbon dioxide, and water. All green plants are examples of autotrophs. These green plants contain chlorophyll pigment in the plant cell that helps in the synthesis of their own food by absorbing energy from the sunlight. All autotrophs are producers and are placed at the primary level in the food web.
Photosynthesis provides the means by which carbon in carbon dioxide is fixed by conversion of carbohydrates including sugars such as glucose and sucrose, cellulose and starches such as amylopectin.
Carbohydrates are interconvertible and may be converted to fatty acids to make lipids. Other elements may be added to synthesize organic compounds such as proteins. Carbohydrates, lipids, and proteins can all be used as sources of energy in respiration by both autotrophs and heterotrophs, recycling carbon dioxide so that it may again be used in photosynthesis.
“Autotrophic nutrition is a process where the organism prepares its food from the simple inorganic materials like water, mineral salts and carbon dioxide in the presence of sunlight.”
Heterotrophs
Heterotrophs are organisms which cannot prepare their own food and depend upon producers or green plants and other animals for their food. This mode of nutrition is known as the heterotrophic mode of nutrition.
Heterotrophs rely on autotrophs to provide a continuous supply of new organic molecules. Heterotrophs are considered as consumers and in the food web and are placed at a secondary or tertiary level.
All the non-green plants and animals, inclusive of human beings, are the best examples of heterotrophs.
The heterotrophs are benefited from photosynthesis in many ways.
Directly by consuming plants as herbivores
Indirectly by attacking, killing and consuming other herbivores animals (carnivores) or both animals and plants (omnivores),
By using oxygen for the cellular respiration process.
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