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

If 10,000 J solar energy falls on green plants in a terrestrial ecosystem, what percentage of solar energy will be converted into food energy?

1000 J

100 J

It will depend on the type of the terrestrial plant

10,000 J

2 / 15

The given figure best represents:

food chain in forest, grassland and pond

Food chain in pond, forest, and grassland

Food chain in grassland, pond, and forest

Food chain in forest, pond, and grassland

Food chain in forest, grassland, and pond

3 / 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

50 kJ

5 kJ

5000 kJ

500 kJ

4 / 15

In 1987, an agreement was formulated by the United Nations Environment Programme (UNEP) to freeze the production of “X” to prevent the depletion of “Y”. “X” and “Y” respectively referred to here are:

CFCs; Ozone

CFCs; rays UV

Ozone; CFCs

UV rays; Diatomic oxygen

5 / 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.

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

A is false but R is true.

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

A is true but R is false.

6 / 15

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

Decomposers

Herbivores

Carnivores

Producers

7 / 15

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

Water

Polluted air

Less availability of food

Decrease in energy at higher trophic levels

8 / 15

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

Convert organic material to inorganic forms

Do not break down organic compounds

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

Act at every trophic level of the food chain

9 / 15

Which of the following features relates to biodegradable substances?

Remain inert

Broken down by biological processes

Persist in the environment for long time

May harm the ecosystem

10 / 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.

A is false, but R is true.

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.

11 / 15

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

Reason: The flow of energy is unidirectional.

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.

12 / 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

Biomagnification

Eutrophication

Pollution

13 / 15

In the food web, what two organisms are competing for food?

A and B

B and D

D and F

A and C

14 / 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

Second trophic level

First trophic level

Third trophic level

15 / 15

Observe the food web and answer the questions given below:

The mussel can be described as

Primary consumer

Decomposer

Secondary consumer

Producers

Your score is

The average score is 62%

Leaderboard – Top Scorers

Check out the highest scorers below!

Pos.	Name	Score	Duration	Points
1	Khushi	100 %	54 seconds	15
2	naimish	100 %	1 minutes 8 seconds	15
3	aka	100 %	22 minutes 34 seconds	15
4	Abhinav. C	93 %	1 minutes 38 seconds	14
5	pawan	93 %	1 minutes 46 seconds	14
6	manpreet	93 %	2 minutes 22 seconds	14
7	cc	93 %	2 minutes 33 seconds	14
8	shinchan	93 %	5 minutes 6 seconds	14
9	tt7hr fy y	87 %	1 minutes 17 seconds	13
10	Z	87 %	1 minutes 23 seconds	13
11	uh	87 %	1 minutes 37 seconds	13
12	manpreet	87 %	1 minutes 37 seconds	13
13	Aditi	87 %	1 minutes 52 seconds	13
14	Krisha	87 %	2 minutes 50 seconds	13
15	isu	87 %	4 minutes 50 seconds	13
16	ladleeeeeeeeeeeee	87 %	5 minutes	13
17	Amit	87 %	5 minutes 15 seconds	13
18	rose	87 %	6 minutes 1 seconds	13
19	MSA	87 %	8 minutes 21 seconds	13
20	Kevin	87 %	13 minutes 12 seconds	13
21	S	87 %	26 minutes 51 seconds	13
22	xxx	80 %	1 minutes 32 seconds	12
23	isu	80 %	2 minutes 58 seconds	12
24	r	80 %	3 minutes 39 seconds	12
25	Yash Kushwaha	80 %	4 minutes 37 seconds	12
26	Sapna	80 %	5 minutes 9 seconds	12
27	K advitha	80 %	5 minutes 30 seconds	12
28	jj	80 %	5 minutes 35 seconds	12
29	k	80 %	5 minutes 36 seconds	12
30	nehmad and gulu	80 %	7 minutes 17 seconds	12
31	A	73 %	1 minutes 13 seconds	11
32	ffff	73 %	2 minutes 54 seconds	11
33	Karthick	73 %	3 minutes 13 seconds	11
34	Abhinav. C	73 %	4 minutes 3 seconds	11
35	Swara	73 %	4 minutes 20 seconds	11
36	Tanishka	73 %	4 minutes 32 seconds	11
37	Rijjakjot	73 %	6 minutes 21 seconds	11
38	Pooja	73 %	9 minutes 15 seconds	11
39	S	73 %	2 hours 56 minutes 44 seconds	11
40	Maria	67 %	3 minutes 28 seconds	10
41	Zer	67 %	3 minutes 51 seconds	10
42	Arpan	67 %	4 minutes 14 seconds	10
43	Tk	67 %	5 minutes 25 seconds	10
44	aaaaaaaaaaaaaaaaaahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh	67 %	8 minutes 22 seconds	10
45	Siddhi Panchal	67 %	9 minutes 12 seconds	10
46	pragna	67 %	9 minutes 41 seconds	10
47	cc	67 %	10 minutes 9 seconds	10
48	k	67 %	11 minutes 19 seconds	10
49	seerat	67 %	11 minutes 53 seconds	10
50	Anurag	67 %	15 minutes 12 seconds	10
51	kushal	60 %	2 minutes 31 seconds	9
52	sanchit	60 %	2 minutes 45 seconds	9
53	m	60 %	2 minutes 49 seconds	9
54	Roya	60 %	3 minutes 20 seconds	9
55	ghfgh	60 %	4 minutes 20 seconds	9
56	Jh	60 %	4 minutes 29 seconds	9
57	Amritha	60 %	5 minutes 40 seconds	9
58	naimish	60 %	7 minutes 3 seconds	9
59	adarsh	60 %	12 minutes 23 seconds	9
60	indu	60 %	16 minutes	9
61	GIIS	60 %	58 minutes 11 seconds	9
62	ghhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiihhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllgggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyghhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhl	53 %	1 minutes 45 seconds	8
63	E	53 %	3 minutes 7 seconds	8
64	arag	53 %	3 minutes 21 seconds	8
65	sddddddddd	53 %	3 minutes 34 seconds	8
66	T	53 %	3 minutes 41 seconds	8
67	66	53 %	4 minutes 38 seconds	8
68	..	53 %	4 minutes 50 seconds	8
69	Mk	53 %	5 minutes 57 seconds	8
70	Big	53 %	7 minutes 21 seconds	8
71	udit kumar	53 %	7 minutes 50 seconds	8
72	Suhani	53 %	8 minutes 33 seconds	8
73	Santosh	53 %	20 minutes 47 seconds	8
74	Hani	47 %	2 minutes 9 seconds	7
75	Bhagat	47 %	2 minutes 51 seconds	7
76	Bazil	47 %	3 minutes 51 seconds	7
77	utkarsh sharma	47 %	4 minutes 23 seconds	7
78	Assha	47 %	4 minutes 36 seconds	7
79	Anushka	47 %	4 minutes 51 seconds	7
80	aahhhhhhhhhhhhhhhhh	47 %	5 minutes 12 seconds	7
81	pawan	47 %	5 minutes 49 seconds	7
82	Ghr	47 %	6 minutes 7 seconds	7
83	manpreet singh	47 %	6 minutes 55 seconds	7
84	Ashki Kumari	47 %	7 minutes 9 seconds	7
85	sanchit	47 %	12 minutes 23 seconds	7
86	1234	47 %	15 minutes 25 seconds	7
87	Mahmood	47 %	16 minutes 26 seconds	7
88	saini	47 %	16 minutes 54 seconds	7
89	manpreet	40 %	1 minutes 11 seconds	6
90	A	40 %	2 minutes 27 seconds	6
91	Tut	40 %	3 minutes 35 seconds	6
92	Anu	40 %	5 minutes 13 seconds	6
93	kriti	40 %	5 minutes 33 seconds	6
94	Pranjal	40 %	6 minutes 16 seconds	6
95	jay	40 %	6 minutes 47 seconds	6
96	Riya	40 %	6 minutes 51 seconds	6
97	pawan	40 %	7 minutes 9 seconds	6
98	Ruth	40 %	13 minutes 22 seconds	6
99	gujjar	33 %	2 minutes 12 seconds	5
100	R sudarshan	33 %	5 minutes 42 seconds	5
101	Nik	33 %	8 minutes 39 seconds	5
102	Biv	27 %	38 seconds	4
103	devansh	27 %	6 minutes	4
104	Bazil	27 %	17 minutes 53 seconds	4
105	Google maps	13 %	5 minutes 52 seconds	2
106	Harshit	7 %	2 minutes 50 seconds	1

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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