Our Environment Practice Questions
Class 10 · Science · 3322 free MCQs with instant results and detailed explanations.
3322
Total
985
Easy
1656
Medium
681
Hard
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Topics in Our Environment
Food Chains and Webs
1101
Ecosystem
1154
Ozone Depletion
1067
Sample Questions from Our Environment
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What is the primary source of energy for almost all ecosystems?
A.
The Moon
B.
The Sun
C.
Wind
D.
Water
Show Answer & Explanation
Correct Answer: B
The Sun provides essential energy for photosynthesis, making it the primary energy source for ecosystems.
Q2
Easy
Which of the following is a biotic component of an ecosystem?
A.
Soil
B.
Water
C.
Plants
D.
Air
Show Answer & Explanation
Correct Answer: C
Plants are living organisms, hence they are considered biotic components, while soil, water, and air are abiotic.
Q3
Easy
Which level of ecological organization includes both living and non-living components?
A.
Population
B.
Community
C.
Ecosystem
D.
Biome
Show Answer & Explanation
Correct Answer: C
An ecosystem encompasses both living (biotic) and non-living (abiotic) components interacting with each other.
Q4
Medium
Which of the following refers to the role of an organism in its ecosystem?
A.
Habitat
B.
Niche
C.
Population
D.
Community
Show Answer & Explanation
Correct Answer: B
A niche describes how an organism interacts with its environment and other organisms.
Q5
Medium
Which of the following is an example of a biotic component of an ecosystem?
A.
Water
B.
Air
C.
Fungi
D.
Soil
Show Answer & Explanation
Correct Answer: C
Fungi are living organisms and thus represent the biotic components of an ecosystem.
Q6
Medium
In a food chain, which level typically has the least amount of energy available?
A.
Producers
B.
Primary consumers
C.
Secondary consumers
D.
Tertiary consumers
Show Answer & Explanation
Correct Answer: D
Energy decreases as it moves up the food chain, with tertiary consumers having the least energy.
Q7
Medium
Which of the following cycles includes the process of transpiration?
A.
Water cycle
B.
Carbon cycle
C.
Nitrogen cycle
D.
Phosphorus cycle
Show Answer & Explanation
Correct Answer: A
Transpiration is the process by which water is absorbed by plants and released into the atmosphere, part of the water cycle.
Q8
Hard
Which of the following best describes an ecosystem?
A.
A community of organisms interacting with their environment
B.
All living organisms in a particular area
C.
The physical environment in which organisms live
D.
Only the plants and animals in a specific region
Show Answer & Explanation
Correct Answer: A
An ecosystem includes both the living organisms and their interactions with the physical environment.
Q9
Hard
In a food web, which of the following roles does the primary producer play?
A.
They consume herbivores
B.
They convert solar energy into chemical energy
C.
They decompose organic matter
D.
They are at the top of the food chain
Show Answer & Explanation
Correct Answer: B
Primary producers, like plants, convert solar energy into chemical energy through photosynthesis.
Q10
Hard
Which of the following statements about biomagnification is true?
A.
It decreases the concentration of toxins in organisms higher up the food chain
B.
It only affects aquatic ecosystems
C.
Toxins accumulate at higher concentrations in organisms at higher trophic levels
D.
It is a process that only occurs in terrestrial ecosystems
Show Answer & Explanation
Correct Answer: C
Biomagnification refers to the increasing concentration of toxins in organisms at higher trophic levels.
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Other Class 10 Subjects
Our Environment — Class 10 Science Practice Questions Online
This page contains 3322 practice MCQs for the chapter Our Environment in Class 10 Science. The questions are organized by difficulty — 985 easy, 1656 medium, 681 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 3 topics, giving you comprehensive coverage of the entire chapter.