Class 4 Science - Our Environment - CBSE Worksheets

Multiple Choice Questions (MCQs)

Choose the correct option for each question.

Q.1. Which of the following is NOT a component of our environment?
(a) Air
(b) Water
(c) Cars
(d) Land

Ans. (c)

Cars are not a natural component of the environment. They are man-made objects and do not occur naturally in the environment.

Q.2. What does hygiene refer to?
(a) Practices to stay healthy and clean
(b) Measures to improve and protect health
(c) Managing biodegradable waste
(d) Recycling materials

Ans. (a)

Hygiene refers to the practices we follow to maintain cleanliness and ensure good health. It includes activities like regular handwashing, personal cleanliness, and maintaining a clean environment.

Q.3. Which of the following is a non-biodegradable material?
(a) Fruits and vegetable peels
(b) Plastic
(c) Paper
(d) Glass

Ans. (b)

Plastic is a non-biodegradable material that does not decompose easily. It persists in the environment for a long time, leading to pollution and environmental degradation.

Q.4. What does the three R's (Reduce, Reuse, Recycle) promote?
(a) Responsible resource management
(b) Deforestation
(c) Pollution
(d) Disease outbreaks

Ans. (a)

The three R's (Reduce, Reuse, Recycle) promote responsible resource management. They encourage individuals to minimize waste generation, conserve resources, and make sustainable choices to protect the environment.

Q.5. How does recycling benefit the environment?
(a) Reduces the need for cutting down trees
(b) Increases pollution levels
(c) Wastes energy
(d) Encourages deforestation

Ans. (a)

Recycling reduces the demand for fresh raw materials, such as trees for paper production. By recycling paper, we can preserve forests and maintain their vital ecological functions, such as habitat preservation and carbon sequestration.

Short Questions

Answer the following questions briefly.

Q.1. List three components of our environment.

Air, water, and land are essential components of our environment. They provide habitats for living organisms and are necessary for sustaining life.

Q.2. Explain why maintaining a clean and healthy environment is important.

Maintaining a clean and healthy environment is important for several reasons. Firstly, it prevents the spread of diseases and ensures the well-being of living organisms, including humans. Secondly, a clean environment contributes to the availability of clean resources like air and water, which are vital for survival. Thirdly, it helps minimize pollution and preserve biodiversity. Lastly, a clean environment promotes the overall quality of life and supports sustainable development.

Q.3. Differentiate between biodegradable and non-biodegradable materials.

Biodegradable materials are substances that can be broken down and decomposed by natural processes, such as bacteria and fungi. Examples include fruits and vegetable peels. Non-biodegradable materials, on the other hand, do not decompose easily and persist in the environment for a long time. Examples include plastic and glass.

Q.4. Name the three R's and briefly explain each one.

• Reduce: It involves using fewer resources and conserving them. Students can contribute by practicing water and electricity conservation, turning off lights and closing taps when not in use. By reducing resource consumption, we can minimize waste generation and environmental impact.
• Reuse: Reusing items helps minimize waste generation. Students can bring reusable bags for shopping, repurpose glass or plastic containers for storage, or donate usable items to those in need. By finding new purposes for items, we can reduce the need for disposable products and reduce waste.
• Recycle: Recycling involves processing materials so that they can be used again. Students can participate by separating recyclable materials like paper, glass, plastic, and aluminum from general waste. These materials are then sent to recycling facilities to be processed into new products. Recycling reduces the demand for raw materials, conserves energy, and minimizes environmental impact.

Q.5. Mention two benefits of recycling for the environment.

• Reducing deforestation: By recycling paper, we reduce the demand for cutting down trees. This helps in preserving forests, maintaining biodiversity, and protecting the habitats of various species.
• Conserving energy: Recycling saves energy compared to manufacturing products from raw materials. The recycling process requires less energy, leading to reduced carbon emissions and promoting sustainability.

Fill in the Blanks

1. Our living space consists of various components like ______________, _______________, _______________, _______________, _______________, and _______________.

Ans. air, water, land, animals, plants, microorganisms

2. Living organisms not only inhabit the environment but also ______________ with it.

Ans. interact

3. Maintaining a clean and hygienic environment is important for leading a ______________ life.

Ans. healthy

4. Proper waste disposal is crucial for ensuring a ______________ environment.

Ans. clean

5. Materials that decompose easily are called ______________, while materials that do not decompose are called ______________.

Ans. biodegradable, non-biodegradable

Match the Column

Match the items in Column A with their appropriate solutions in Column B.

Ans.

True or False

Determine whether the following statements are true or false.

1. The environment is only composed of non-living entities.

Ans. False

2. Living organisms do not interact with the environment.

Ans. False

3. Reusing items helps minimize waste generation.

Ans. True

4. Recycling reduces the need for cutting down trees.

Ans. True

5. Conserving resources like water and electricity is not necessary.

Ans. False