Our Environment Class 10 Science MCQ Quiz – Test Your Knowledge

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Are you ready to test your knowledge of Our Environment? This chapter focuses on ecosystem components, food chains, trophic levels, ozone layer depletion, and waste management—important topics for your CBSE Class 10 Science exam.

About the Quiz

Chapter Name: Our Environment
Subject: Science (Biology)
Book: NCERT Class 10 Science
Question Type: Multiple Choice Questions (MCQs)
Leaderboard: Yes (Compete with Others!)

Why Take This Quiz?

✔ Helps in quick revision for board exams
✔ Covers important NCERT-based questions
✔ Leaderboard feature to track your performance

Click Below to Start the Quiz!

Chapter 13 - Our Environment

1 / 15

Assertion: Biodegradable substances result in the formation of compost and natural replenishment.

Reason: It is due to the breakdown of complex inorganic substances into simple organic substances.

A is true but R is false.

Both A and R are true, and R is not the correct explanation of A.

A is false but R is true.

Both A and R are true, and R is the correct explanation of A.

2 / 15

Which of the following limits the number of trophic levels in a food chain?

Decrease in energy at higher trophic levels

Polluted air

Less availability of food

Water

3 / 15

Matter and energy are two fundamental inputs of an ecosystem. Movement of

Energy is multidirectional and the matter is bidirectional

Energy is repeatedly circulation and the matter is unidirectional

Energy is bidirectional and the matter is repeatedly circulating

Energy is unidirectional and the matter is repeatedly circulating

4 / 15

If Ravi is consuming curd/yogurt for lunch, which trophic level in a food chain he should be considered as occupying?

Fourth trophic level

First trophic level

Third trophic level

Second trophic level

5 / 15

The chemicals that are non-degradable, get progressively accumulated at each trophic level, and their concentration is seen maximum in the bodies of top consumers. This phenomenon is known as:

Accumulation

Eutrophication

Pollution

Biomagnification

6 / 15

Which of the following organisms convert organic material to inorganic forms?

Decomposers

Herbivores

Producers

Carnivores

7 / 15

The given figure best represents:

Food chain in forest, grassland, and pond

Food chain in pond, forest, and grassland

Food chain in forest, pond, and grassland

Food chain in grassland, pond, and forest

8 / 15

Assertion: The food chain is responsible for the entry of harmful chemicals into our bodies.

Reason: The length and complexity of food chains vary greatly.

A is true, but R is false.

Both A and R are true, but R is not the correct explanation of the assertion.

Both A and R are true, and R is the correct explanation of the assertion.

A is false, but R is true.

9 / 15

Why do all food chains start with plants?

Because plants do not require energy

Because plants are easily grown

Because plants can produce their own energy

Because plants are nutritious

10 / 15

Observe the food web and answer the questions given below:

The mussel can be described as

Producers

Decomposer

Primary consumer

Secondary consumer

11 / 15

If a deer is eaten by a tiger, then the energy transfer will be from

Producer to decomposer

Producer to primary consumer

Secondary consumer to environment

Primary consumer to secondary consumer

12 / 15

Assertion: A greater number of individuals are present in lower trophic levels.

Reason: The flow of energy is unidirectional.

A is false, but R is true.

Both A and R are true, and R is the correct explanation of the assertion.

A is true, but R is false.

Both A and R are true, but R is not the correct explanation of the assertion.

13 / 15

In the given food chain, suppose the amount of energy at the fourth trophic level is 5 kJ, what will be the energy available at the producer level?

Grass → Grasshopper → Frog → Snake → Hawk

5 kJ

5000 kJ

500 kJ

50 kJ

14 / 15

Which trophic level is incorrectly defined?

Decomposers – microbial heterotrophs

Carnivores – Secondary or tertiary consumers

Omnivores – molds, yeast, and mushrooms

Herbivores – primary consumers

15 / 15

The decomposers are not included in the food chain. The correct reason for the same is because decomposers:

Act at every trophic level of the food chain

Release enzymes outside their body to convert organic material to inorganic forms

Do not break down organic compounds

Convert organic material to inorganic forms

Your score is

The average score is 65%

Leaderboard – Top Scorers

Check out the highest scorers below!

Pos.	Name	Score	Duration	Points
1	naimish	100 %	1 minutes 8 seconds	15
2	pawan	93 %	1 minutes 46 seconds	14
3	tt7hr fy y	87 %	1 minutes 17 seconds	13
4	Z	87 %	1 minutes 23 seconds	13
5	uh	87 %	1 minutes 37 seconds	13
6	Krisha	87 %	2 minutes 50 seconds	13
7	isu	87 %	4 minutes 50 seconds	13
8	Amit	87 %	5 minutes 15 seconds	13
9	rose	87 %	6 minutes 1 seconds	13
10	MSA	87 %	8 minutes 21 seconds	13
11	S	87 %	26 minutes 51 seconds	13
12	xxx	80 %	1 minutes 32 seconds	12
13	isu	80 %	2 minutes 58 seconds	12
14	r	80 %	3 minutes 39 seconds	12
15	Sapna	80 %	5 minutes 9 seconds	12
16	k	80 %	5 minutes 36 seconds	12
17	nehmad and gulu	80 %	7 minutes 17 seconds	12
18	A	73 %	1 minutes 13 seconds	11
19	Rijjakjot	73 %	6 minutes 21 seconds	11
20	pragna	67 %	9 minutes 41 seconds	10
21	k	67 %	11 minutes 19 seconds	10
22	seerat	67 %	11 minutes 53 seconds	10
23	sanchit	60 %	2 minutes 45 seconds	9
24	Jh	60 %	4 minutes 29 seconds	9
25	naimish	60 %	7 minutes 3 seconds	9
26	indu	60 %	16 minutes	9
27	GIIS	60 %	58 minutes 11 seconds	9
28	ghhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiihhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllgggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyghhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhl	53 %	1 minutes 45 seconds	8
29	E	53 %	3 minutes 7 seconds	8
30	T	53 %	3 minutes 41 seconds	8
31	..	53 %	4 minutes 50 seconds	8
32	Mk	53 %	5 minutes 57 seconds	8
33	Suhani	53 %	8 minutes 33 seconds	8
34	Santosh	53 %	20 minutes 47 seconds	8
35	utkarsh sharma	47 %	4 minutes 23 seconds	7
36	Assha	47 %	4 minutes 36 seconds	7
37	Anushka	47 %	4 minutes 51 seconds	7
38	pawan	47 %	5 minutes 49 seconds	7
39	sanchit	47 %	12 minutes 23 seconds	7
40	Mahmood	47 %	16 minutes 26 seconds	7
41	saini	47 %	16 minutes 54 seconds	7
42	A	40 %	2 minutes 27 seconds	6
43	pawan	40 %	7 minutes 9 seconds	6
44	gujjar	33 %	2 minutes 12 seconds	5
45	R sudarshan	33 %	5 minutes 42 seconds	5
46	Bazil	27 %	17 minutes 53 seconds	4

Key Topics Covered in the Quiz

✔ Ecosystem and Its Components
✔ Food Chain & Food Web
✔ Trophic Levels and Energy Flow
✔ Biodegradable & Non-Biodegradable Substances
✔ Ozone Layer & Its Depletion
✔ Waste Management & Sustainable Development

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About the Quiz

Why Take This Quiz?

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Key Topics Covered in the Quiz

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