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How Nature Works in Harmony - What Happens to Waste in Nature?

Grade 8CBSE

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

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Nature operates on a zero-waste principle where the waste of one organism serves as a resource for another, maintaining a delicate balance.

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Biodegradable Waste: Substances that can be broken down into simpler, harmless substances by the action of microorganisms like bacteria and fungi. Examples include fruit peels, paper, and animal dung which contain organic compounds like C6H12O6C_6H_{12}O_6.

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Non-biodegradable Waste: Materials that cannot be decomposed by biological processes, such as plastics, glass, and metal scraps. These persist in the environment for many years, often exceeding 400400 years.

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Decomposers: Organisms such as fungi and bacteria that break down dead organic matter into inorganic nutrients like CO2CO_2, H2OH_2O, and minerals, returning them to the soil and atmosphere.

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Composting: The process of converting organic waste into nutrient-rich manure. Vermicomposting involves the use of Redworms to accelerate this decomposition.

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Nutrient Cycling: The continuous movement of essential elements like Carbon (CC), Nitrogen (N2N_2), and Oxygen (O2O_2) through the biotic and abiotic components of the ecosystem.

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The 5 R's Principle: To maintain harmony, humans must follow Refuse, Reduce, Reuse, Repurpose, and Recycle to manage the waste that nature cannot process.

📐Formulae

C6H12O6+6O2→6CO2+6H2O+Energy (Heat)C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{Energy (Heat)}

Rate of Decomposition=Weight of Waste lostTime taken\text{Rate of Decomposition} = \frac{\text{Weight of Waste lost}}{\text{Time taken}}

Waste Reduction %=(Initial Mass−Final MassInitial Mass)×100\text{Waste Reduction } \% = \left( \frac{\text{Initial Mass} - \text{Final Mass}}{\text{Initial Mass}} \right) \times 100

💡Examples

Problem 1:

A school garden produces 850 kg850\text{ kg} of organic waste. After composting for three months, the resulting manure weighs 275 kg275\text{ kg}. Calculate the total mass lost during the decomposition process using vertical subtraction.

Solution:

850−275575\begin{array}{r} 850 \\ - 275 \\ \hline 575 \end{array}

Explanation:

The total mass of organic matter converted into gases like CO2CO_2 and water vapor H2OH_2O during decomposition is 575 kg575\text{ kg}.

Problem 2:

Identify the chemical process represented by 6CO2+6H2O→C6H12O6+6O26CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2 and explain its role in nature's harmony.

Solution:

This is the process of Photosynthesis.

Explanation:

In nature's harmony, plants take in the 'waste' CO2CO_2 produced by animal respiration and decomposition and convert it into glucose (C6H12O6C_6H_{12}O_6) and O2O_2, which are essential for the survival of aerobic organisms.