Test: Our Natural Resources - Grade 4 MCQ

The major disadvantage of non-renewable resources is that they are limited in supply and cannot be easily replaced once depleted. This leads to concerns about sustainability and environmental impacts as these resources are consumed rapidly.

The process of transforming crude oil into usable products such as petrol and diesel is called refining. This process separates different components based on their boiling points to produce various fuels and chemicals.

Coal is a non-renewable resource because it takes millions of years to form from the remains of ancient plants and animals. Once depleted, it cannot be replaced within a human timeframe, unlike renewable resources.

Wind energy is primarily used to generate electricity. Windmills convert the kinetic energy of wind into electrical energy, which can then be used in homes, schools, and factories.

Plants contribute to the environment by producing oxygen through photosynthesis and absorbing carbon dioxide, thus helping to regulate the atmosphere and combat global warming. They play a vital role in maintaining ecological balance.

Using energy-efficient appliances is an effective way to save electricity at home. These appliances consume less power while providing the same level of performance, helping reduce energy bills and environmental impact.

Petroleum is an example of a fossil fuel, formed over millions of years from the remains of ancient marine organisms. It is a significant source of energy used for fuel and various products.

Human activities such as deforestation, pollution, and overconsumption lead to the pollution and depletion of natural resources. This can harm ecosystems and reduce the availability of resources for future generations.

Hydroelectric power is primarily used for generating electricity. It harnesses the energy of flowing water, typically from dams, to produce renewable energy that powers homes and industries.

Animals play a crucial role in ecosystems by helping with seed dispersal, which promotes plant growth and biodiversity. They also provide various resources such as food, materials, and even support ecological processes like pollination.

Trees play a crucial role in maintaining environmental balance by absorbing carbon dioxide and releasing oxygen, thus helping to mitigate climate change. They also provide habitat, food, and other ecosystem services.

Soil is classified as a renewable resource because it can be replenished through natural processes like decomposition and nutrient cycling. Healthy soil supports plant growth, which is essential for food production.

Renewable resources are those that can be replenished naturally over time. Examples include air, water, sunlight, and plants, which are continuously available and can be used repeatedly without depleting the resource.

Clean drinking water is necessary for survival because all living beings require water for various bodily functions, including hydration, digestion, and temperature regulation. Access to safe water is crucial for health and wellbeing.

Copper is widely known for its excellent electrical conductivity, making it the preferred choice for manufacturing electrical wires. Its malleability and resistance to corrosion add to its utility in electrical applications.

The main purpose of using solar panels is to capture sunlight and convert it into energy, either as electricity or heat. This technology provides a clean and renewable energy source that reduces reliance on fossil fuels.

Renewable resources can be replenished naturally over time. They include resources like sunlight, wind, and water, which are perpetually available and can be used sustainably.

Only about 3% of the Earth's water is safe for drinking. The majority of Earth's water is saltwater, found in oceans, which is not suitable for human consumption without desalination processes.

Deforestation and pollution significantly contribute to the extinction of plant and animal species by destroying their habitats and contaminating the environment. This disrupts ecosystems and reduces biodiversity.

Planting more trees is an effective method to conserve natural resources. Trees help improve air quality, prevent soil erosion, and provide habitats for wildlife, thus playing a vital role in environmental conservation.