Our Environment - 2 Class 3 Worksheet Science

Q1: Multiple-Choice Questions (MCQs)

(i) What is the term for everything that surrounds us, including living and non-living things?
(a) Ecosystem
(b) Planet
(c) Space
(d) Environment
Ans: (d)
The environment includes everything around us, including the air, water, soil, plants, animals, and human-made structures.

(ii) What is the process of plants making food using sunlight called?

(a) Photosynthesis
(b) Respiration
(c) Decomposition
(d) Digestion
Ans: (a)
Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to make their own food. 

(iii) What do we call the different living things and their surroundings that interact with each other?
(a) Environment
(b) Ecosystem
(c) Universe
(d) Atmosphere
Ans: (b)
An ecosystem is a community of living organisms and their physical environment, interacting together.

(iv) Which of the following is a natural resource that comes from trees and is used to make paper?
(a) Plastic
(b) Metal
(c) Paper
(d) Glass
Ans: (c) 
Paper is made from trees, which are a renewable natural resource.

(v) Which of the following is an example of a non-renewable resource?
(a) Wind energy
(b) Solar energy
(c) Coal
(d) Rainwater
Ans: (c)
Coal is a non-renewable resource, meaning it takes a very long time to form and cannot be easily replaced once used up.

Q2: Fill in the Blanks

(i) Water, air, soil, plants, and animals together make up our __________.
Ans: environment
These components collectively form the environment we live in.

(ii) Recycling helps us use resources __________ and helps keep the environment clean.
Ans: wisely
Recycling allows us to use resources efficiently and reduce waste.

(iii) The place where an animal or plant lives and gets everything it needs is called its __________.
Ans: habitat
A habitat provides the necessary conditions for an organism to survive and thrive.

(iv) Pollution is harmful to our environment and can make air, water, and soil __________.
Ans: dirty
Pollution can contaminate these natural resources, making them unsuitable for use.

(v) The energy that comes from the sun is called __________ energy.
Ans: solar
Solar energy is harnessed from the sun's rays and can be used for various purposes.

Q3: True/False Questions

(i) Trees and plants are not important for our environment.
Ans: False

(ii) Renewable resources can be used up and run out.
Ans: False

(iii) Ecosystems only include living things and not the physical surroundings.
Ans: False

(iv) Pollution can have negative effects on human health.
Ans: True

(v) Plastic is a biodegradable material.
Ans: False

Q4: Answer the following Questions

(i) Define the term "environment" and explain why it is considered all-inclusive.
Ans: The environment refers to our surroundings, encompassing both living and non-living elements such as air, water, land, people, buildings, traffic, noise, and plants. It is all-inclusive because it includes every aspect of our surroundings, both natural and man-made, that directly or indirectly influences living organisms.

(ii) Describe an activity that improves the environment and another activity that disturbs it, providing examples for each.
Ans: Tree plantation is an activity that improves the environment. Trees absorb carbon dioxide, provide oxygen, and support biodiversity. On the other hand, littering with plastic bags disturbs the environment. Plastic pollution harms wildlife, marine life, and ecosystems, leading to environmental degradation.

(iii) Explain the concept of the environment having a tolerance level. Provide an example of an environmental factor with a tolerance level.
Ans: The environment has a tolerance level, indicating the maximum stress it can endure without significant harm. For example, running water in rivers can tolerate sewer discharge up to a certain level. Beyond this threshold, the water becomes polluted, affecting aquatic life and human health. Understanding these tolerance levels is essential for sustainable environmental management.

(iv) Why is it important for humans to be mindful of their actions in the environment?
Ans: Humans are an integral part of the environment, and their actions directly impact the ecosystem and other living organisms. Being mindful of their actions is crucial to prevent environmental degradation. By adopting eco-friendly practices, reducing pollution, and conserving natural resources, humans can maintain a healthy environment for present and future generations.