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Biodegradable

Biodegradable substances are materials that can be broken down by microorganisms into simpler substances.

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Student-friendly explanation

Microorganisms such as bacteria and fungi decompose biodegradable waste like vegetable peels, paper, and dry leaves. This makes such waste suitable for composting and natural recycling. The breakdown happens because living decomposers can act on the material over time.

How to write this in exams

  1. 1

    Start with the exact idea

    Biodegradable substances are materials that can be broken down by microorganisms into simpler substances.

  2. 2

    Then show how to use it

    1. Ask whether microorganisms can break it down. 2. Check if it decomposes naturally. 3. If yes, classify it as biodegradable. 4. Give a common example.

  3. 3

    Add one concrete example

    Vegetable peels thrown into a compost pit slowly change into compost with the help of microbes.

  4. 4

    Avoid this incomplete answer

    A common wrong answer is to call plastic biodegradable because it can become smaller pieces. That is wrong because microbes do not easily decompose plastic.

Definition

Biodegradable substances are materials that can be broken down by microorganisms into simpler substances.

Example

Vegetable peels thrown into a compost pit slowly change into compost with the help of microbes.

Rule to remember

Biodegradable = can be decomposed by microorganisms into simpler substances.

Memory hook

Bio means living, so living decomposers can break it down.

Examples and method

Worked example

A paper napkin buried in moist soil gradually breaks down because microbes act on it. That is why paper is considered biodegradable.

Method to apply

1. Ask whether microorganisms can break it down. 2. Check if it decomposes naturally. 3. If yes, classify it as biodegradable. 4. Give a common example.

Diagram support

Show waste changing into compost through decomposers like bacteria and fungi.

How CBSE asks it

Classify a material as biodegradable or non-biodegradable, or explain how composting works.

Avoid common mistakes

Common confusion

Students often think anything that breaks into small pieces is biodegradable. Breaking physically is not the same as being decomposed by microbes.

Common wrong answer

A common wrong answer is to call plastic biodegradable because it can become smaller pieces. That is wrong because microbes do not easily decompose plastic.

Exam tip

Link biodegradable waste with composting, soil enrichment, and decomposers in your answer.

Quick check

Why are vegetable peels called biodegradable waste?

Vegetable peels are called biodegradable waste because bacteria and fungi can decompose them into simpler substances. They do not remain unchanged in the environment for a long time.

Answer writing and exam use

1-mark answer

Biodegradable substances are materials that can be broken down by microorganisms into simpler substances.

2-mark answer

Biodegradable substances are materials that can be broken down by microorganisms into simpler substances. Biodegradable = can be decomposed by microorganisms into simpler substances. Vegetable peels thrown into a compost pit slowly change into compost with the help of microbes.

3-mark answer

Microorganisms such as bacteria and fungi decompose biodegradable waste like vegetable peels, paper, and dry leaves. This makes such waste suitable for composting and natural recycling. The breakdown happens because living decomposers can act on the material over time. Biodegradable = can be decomposed by microorganisms into simpler substances. A paper napkin buried in moist soil gradually breaks down because microbes act on it. That is why paper is considered biodegradable. Classify a material as biodegradable or non-biodegradable, or explain how composting works. A common wrong answer is to call plastic biodegradable because it can become smaller pieces. That is wrong because microbes do not easily decompose plastic.
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