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Food Chain

A food chain is a simple straight sequence that shows how food and energy pass from one organism to another.

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Student-friendly explanation

In a food chain, energy starts from the Sun, reaches producers like green plants, and then moves to consumers such as herbivores and carnivores. The chain is linear, so each step depends on the previous one. The direction of the arrow shows the flow of food energy from the eaten organism to the eater.

How to write this in exams

  1. 1

    Start with the exact idea

    A food chain is a simple straight sequence that shows how food and energy pass from one organism to another.

  2. 2

    Then show how to use it

    1. Start with a producer. 2. Add the organism that eats it. 3. Continue one step at a time. 4. Check that every arrow shows energy flow correctly.

  3. 3

    Add one concrete example

    Grass is eaten by grasshopper, grasshopper is eaten by frog, frog is eaten by snake, and snake is eaten by eagle.

  4. 4

    Avoid this incomplete answer

    A common wrong answer is to draw arrows in the opposite direction. This is wrong because the arrow shows who is being eaten, not who is eating.

Definition

A food chain is a simple straight sequence that shows how food and energy pass from one organism to another.

Example

Grass is eaten by grasshopper, grasshopper is eaten by frog, frog is eaten by snake, and snake is eaten by eagle.

Rule to remember

Food chain rule: energy flows from producer to consumer, and the arrow points from food to eater.

Sequence to remember

Food chain rule: energy flows from producer to consumer, and the arrow points from food to eater. Draw a straight line of arrows such as grass>
grasshopper>
frog>
snake>
eagle. 1. Start with a producer. 2. Add the organism that eats it. 3. Continue one step at a time. 4. Check that every arrow shows energy flow correctly

Memory hook

Arrow goes from food to eater, so the chain always moves forward in feeding order.

Examples and method

Worked example

If grass is removed from a chain, the grasshopper loses its food source. Then frogs get less food, and the number of higher consumers also falls.

Method to apply

1. Start with a producer. 2. Add the organism that eats it. 3. Continue one step at a time. 4. Check that every arrow shows energy flow correctly.

Diagram support

Draw a straight line of arrows such as grass → grasshopper → frog → snake → eagle.

How CBSE asks it

Complete a food chain, identify producer and consumers, or explain the effect of removing one link.

Avoid common mistakes

Common confusion

Students often reverse the arrows. They think the arrow points to the food, but it actually points toward the organism that eats it.

Common wrong answer

A common wrong answer is to draw arrows in the opposite direction. This is wrong because the arrow shows who is being eaten, not who is eating.

Exam tip

When writing a food chain, always start with the producer and keep the order of feeding clear.

Quick check

In a food chain, why does the arrow point from grass to grasshopper?

The arrow points from grass to grasshopper because it shows the direction of energy flow. Grass is eaten by grasshopper, so the food energy moves from the plant to the consumer.

Study the food chain diagram carefully

Use the labelled diagram to keep food chain clear in short answers and revision.

What this diagram makes clear

This diagram keeps the labels and direction of food chain in the right order.

Where this helps in exams

Use this for labelled diagram work and short exam answers on food chain.

Revision cue

Revise food chain through the labels before writing the answer.

Answer writing and exam use

1-mark answer

A food chain is a simple straight sequence that shows how food and energy pass from one organism to another.

2-mark answer

A food chain is a simple straight sequence that shows how food and energy pass from one organism to another. Food chain rule: energy flows from producer to consumer, and the arrow points from food to eater. Grass is eaten by grasshopper, grasshopper is eaten by frog, frog is eaten by snake, and snake is eaten by eagle.

3-mark answer

In a food chain, energy starts from the Sun, reaches producers like green plants, and then moves to consumers such as herbivores and carnivores. The chain is linear, so each step depends on the previous one. The direction of the arrow shows the flow of food energy from the eaten organism to the eater. Food chain rule: energy flows from producer to consumer, and the arrow points from food to eater. If grass is removed from a chain, the grasshopper loses its food source. Then frogs get less food, and the number of higher consumers also falls. Complete a food chain, identify producer and consumers, or explain the effect of removing one link. A common wrong answer is to draw arrows in the opposite direction. This is wrong because the arrow shows who is being eaten, not who is eating.
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