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Nutrition in organisms

Nutrition is the process of taking in food and using it for energy, growth, repair, and maintenance.

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Student-friendly explanation

Different organisms do not obtain food in the same way. Green plants make food by photosynthesis, while animals and fungi depend on other sources. Nutrition is not only eating; it also includes digestion, absorption, transport, and use of food by cells.

How to write this in exams

  1. 1

    Start with the exact idea

    Nutrition is the process of taking in food and using it for energy, growth, repair, and maintenance.

  2. 2

    Then show how to use it

    1. State the purpose of food. 2. Mention the source of food. 3. Add whether the organism makes or takes food. 4. Link it to energy and growth.

  3. 3

    Add one concrete example

    A green plant making glucose in leaves and a human digesting rice are both examples of nutrition.

  4. 4

    Avoid this incomplete answer

    Nutrition means only eating food. This is wrong because nutrition also covers making, digesting, absorbing, and using food.

Definition

Nutrition is the process of taking in food and using it for energy, growth, repair, and maintenance.

Example

A green plant making glucose in leaves and a human digesting rice are both examples of nutrition.

Rule to remember

Rule: Nutrition includes obtaining food, processing it if needed, and using it in cells.

Sequence to remember

Rule: Nutrition includes obtaining food, processing it if needed, and using it in cells. Use a simple flow chart: intake or synthesis>
digestion if needed>
absorption>
transport>
use in cells. 1. State the purpose of food. 2. Mention the source of food. 3. Add whether the organism makes or takes food. 4. Link it to energy and growth

Memory hook

Nutrition is not just eating; it is food used for life.

Examples and method

Worked example

A mango tree makes its own food in leaves, while a dog depends on food from outside. Both need nutrition because both must get energy for life activities.

Method to apply

1. State the purpose of food. 2. Mention the source of food. 3. Add whether the organism makes or takes food. 4. Link it to energy and growth.

Diagram support

Use a simple flow chart: intake or synthesis → digestion if needed → absorption → transport → use in cells.

How CBSE asks it

Define nutrition, compare autotrophic and heterotrophic nutrition, or explain why food is needed by living organisms.

Avoid common mistakes

Common confusion

Students often think nutrition means only eating food or only digestion.

Common wrong answer

Nutrition means only eating food. This is wrong because nutrition also covers making, digesting, absorbing, and using food.

Exam tip

When answering, mention both the source of food and the way it is used by the body.

Quick check

What is the main purpose of nutrition in living organisms?

The main purpose of nutrition is to provide energy and raw materials for growth, repair, and daily life activities.

Study the nutrition in organisms diagram carefully

Use the labelled diagram to keep nutrition in organisms clear in short answers and revision.

What this diagram makes clear

This diagram keeps the labels and direction of nutrition in organisms in the right order.

Where this helps in exams

Use this for labelled diagram work and short exam answers on nutrition in organisms.

Revision cue

Revise nutrition in organisms through the labels before writing the answer.

Answer writing and exam use

1-mark answer

Nutrition is the process of taking in food and using it for energy, growth, repair, and maintenance.

2-mark answer

Nutrition is the process of taking in food and using it for energy, growth, repair, and maintenance. Rule: Nutrition includes obtaining food, processing it if needed, and using it in cells. A green plant making glucose in leaves and a human digesting rice are both examples of nutrition.

3-mark answer

Different organisms do not obtain food in the same way. Green plants make food by photosynthesis, while animals and fungi depend on other sources. Nutrition is not only eating; it also includes digestion, absorption, transport, and use of food by cells. Rule: Nutrition includes obtaining food, processing it if needed, and using it in cells. A mango tree makes its own food in leaves, while a dog depends on food from outside. Both need nutrition because both must get energy for life activities. Define nutrition, compare autotrophic and heterotrophic nutrition, or explain why food is needed by living organisms. Nutrition means only eating food. This is wrong because nutrition also covers making, digesting, absorbing, and using food.
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