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Earth—Our Shared Home - Interconnected World: People, Culture, and Nature

Grade 5CBSE

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

🔑Concepts

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The Biosphere: Earth is our shared home where the Lithosphere (land), Hydrosphere (water), and Atmosphere (air) meet to support life. This narrow zone is called the Biosphere.

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Interdependence: Humans, plants, and animals are interconnected. Plants produce oxygen (O2O_2) through photosynthesis, while humans and animals release carbon dioxide (CO2CO_2), which plants need.

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The Greenhouse Effect: Certain gases like carbon dioxide (CO2CO_2) and methane (CH4CH_4) trap the sun's heat. While necessary to keep Earth warm, an excess leads to Global Warming.

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Cultural Adaptation: People adapt their culture, clothing, and food habits based on their natural surroundings. For example, people in cold regions wear fur/wool to maintain body heat (Tbody≈37∘CT_{body} \approx 37^\circ C).

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Sustainable Development: The practice of using resources wisely so they are available for future generations. This is often summarized by the 3 Rs: Reduce, Reuse, and Recycle.

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Biodiversity: The variety of life on Earth. Every organism plays a specific role in the food chain to maintain the ecological balance.

📐Formulae

6CO2+6H2O→Sunlight/ChlorophyllC6H12O6+6O26CO_2 + 6H_2O \xrightarrow{\text{Sunlight/Chlorophyll}} C_6H_{12}O_6 + 6O_2

Earth’s Atmosphere≈78%N2+21%O2+1% (Other gases)\text{Earth's Atmosphere} \approx 78\% N_2 + 21\% O_2 + 1\% \text{ (Other gases)}

ΔT=Tfinal−Tinitial\Delta T = T_{final} - T_{initial}

Sustainability=Resource Conservation+Waste Management\text{Sustainability} = \text{Resource Conservation} + \text{Waste Management}

💡Examples

Problem 1:

A city produces 85008500 kg of waste daily. If the city manages to recycle 36753675 kg, how much waste still goes to the landfill?

Solution:

Waste for landfill = Total waste - Recycled waste.

8500−36754825\begin{array}{r} 8500 \\ - 3675 \\ \hline 4825 \end{array}

Explanation:

By subtracting the recycled amount from the total waste, we find that 48254825 kg of waste is not being reused or recycled, showing the need for better waste management.

Problem 2:

Explain the gas exchange between a tree and a human in a closed system.

Solution:

The tree takes in CO2CO_2 and releases O2O_2. The human takes in O2O_2 and releases CO2CO_2.

Explanation:

This demonstrates 'Interconnectedness'. The chemical formula for this balance involves the movement of O2O_2 and CO2CO_2 molecules between biotic components.

Problem 3:

If the average global temperature increases by 0.02∘C0.02^\circ C every year, what will be the total increase after 5050 years?

Solution:

Total increase = 0.02×50=1.00∘C0.02 \times 50 = 1.00^\circ C.

Explanation:

Using the formula for change over time, even a small decimal increase (0.020.02) results in a significant 1∘C1^\circ C change over half a century, contributing to climate change.