Our Environment Class 10 Science MCQ Quiz – Test Your Knowledge

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
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Chapter 13 - Our Environment

1 / 15

Which trophic level is incorrectly defined?

Decomposers – microbial heterotrophs

Carnivores – Secondary or tertiary consumers

Omnivores – molds, yeast, and mushrooms

Herbivores – primary consumers

2 / 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

3 / 15

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

Energy is unidirectional and the matter is repeatedly circulating

Energy is repeatedly circulation and the matter is unidirectional

Energy is bidirectional and the matter is repeatedly circulating

Energy is multidirectional and the matter is bidirectional

4 / 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, and R is the correct explanation of the assertion.

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

5 / 15

Observe the food web and answer the questions given below:

The mussel can be described as

Decomposer

Primary consumer

Secondary consumer

Producers

6 / 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

5000 kJ

500 kJ

5 kJ

7 / 15

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

Primary consumer to secondary consumer

Producer to primary consumer

Secondary consumer to environment

Producer to decomposer

8 / 15

The given figure best represents:

food chain in forest, grassland and pond

Food chain in grassland, pond, and forest

Food chain in pond, forest, and grassland

Food chain in forest, pond, and grassland

Food chain in forest, grassland, and pond

9 / 15

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

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

Do not break down organic compounds

Act at every trophic level of the food chain

Convert organic material to inorganic forms

10 / 15

What will happen if deer is missing from the food chain given below?

Grass → Deer → Tiger

The population of tigers decreases and the population of grass increases

The population of grass decreases

Tiger will start eating grass

The population of tigers increases

11 / 15

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

D and F

A and C

B and D

A and B

12 / 15

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

Water

Decrease in energy at higher trophic levels

Less availability of food

Polluted air

13 / 15

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

Decomposers

Herbivores

Carnivores

Producers

14 / 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; rays UV

UV rays; Diatomic oxygen

Ozone; CFCs

CFCs; Ozone

15 / 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 not the correct explanation of A.

A is true but R is false.

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

A is false but R is true.

Your score is

The average score is 60%

Leaderboard – Top Scorers

Check out the highest scorers below!

Pos.	Name	Score	Duration	Points
1	Priya	100 %	1 minutes 10 seconds	15
2	Abhinav	100 %	1 minutes 23 seconds	15
3	Sa	100 %	1 minutes 26 seconds	15
4	Varun	100 %	1 minutes 37 seconds	15
5	Priya Singh	100 %	1 minutes 42 seconds	15
6	Priya Singh	100 %	1 minutes 47 seconds	15
7	varun	100 %	1 minutes 47 seconds	15
8	Nirun	100 %	1 minutes 51 seconds	15
9	Anmol	100 %	2 minutes 2 seconds	15
10	Manu Manvith	100 %	2 minutes 5 seconds	15
11	Veer	100 %	2 minutes 9 seconds	15
12	,,,,	100 %	2 minutes 10 seconds	15
13	Manvith	100 %	3 minutes 1 seconds	15
14	Shree	100 %	3 minutes 23 seconds	15
15	Pritha	100 %	3 minutes 33 seconds	15
16	varun	100 %	5 minutes 38 seconds	15
17	Priya Singh	100 %	8 minutes 17 seconds	15
18	Akarsh	93 %	1 minutes 30 seconds	14
19	Vivian	93 %	1 minutes 35 seconds	14
20	Priya	93 %	2 minutes 8 seconds	14
21	Varun	93 %	2 minutes 8 seconds	14
22	Priya Singh	93 %	2 minutes 12 seconds	14
23	Priya Singh	93 %	2 minutes 25 seconds	14
24	Ashish	93 %	2 minutes 34 seconds	14
25	/	93 %	2 minutes 37 seconds	14
26	Judith	93 %	2 minutes 46 seconds	14
27	Nirun	93 %	2 minutes 46 seconds	14
28	Mahi	93 %	2 minutes 52 seconds	14
29	Harshita	93 %	3 minutes 11 seconds	14
30	.	93 %	3 minutes 22 seconds	14
31	Gaurav	93 %	5 minutes 19 seconds	14
32	Priya Singh	93 %	7 minutes 1 seconds	14
33	Sivangi	93 %	10 minutes 51 seconds	14
34	Iqra Nafees	93 %	12 minutes 20 seconds	14
35	varun	93 %	31 minutes 21 seconds	14
36	Jkl	87 %	1 minutes 39 seconds	13
37	Hi	87 %	1 minutes 57 seconds	13
38	Shabby	87 %	2 minutes 8 seconds	13
39	Amal Roshna	87 %	2 minutes 9 seconds	13
40	Soumya	87 %	2 minutes 15 seconds	13
41	Anaya	87 %	2 minutes 45 seconds	13
42	Varun	87 %	3 minutes	13
43	.	87 %	3 minutes 11 seconds	13
44	Kajal	87 %	3 minutes 16 seconds	13
45	Cc	87 %	3 minutes 18 seconds	13
46	Anushka	87 %	3 minutes 19 seconds	13
47	Anmol	87 %	3 minutes 22 seconds	13
48	golu chaudhry	87 %	3 minutes 24 seconds	13
49	A	87 %	3 minutes 56 seconds	13
50	Anu	87 %	3 minutes 58 seconds	13
51	Praveen	87 %	4 minutes 11 seconds	13
52	Abhishek Kumar	87 %	4 minutes 15 seconds	13
53	Judith	87 %	4 minutes 46 seconds	13
54	Shalu	87 %	4 minutes 52 seconds	13
55	M	87 %	5 minutes 36 seconds	13
56	Shraddha	87 %	5 minutes 36 seconds	13
57	gfyfyt	87 %	5 minutes 57 seconds	13
58	Harahul	87 %	6 minutes 26 seconds	13
59	H	87 %	8 minutes 11 seconds	13
60	akki	87 %	17 minutes 41 seconds	13
61	Akarsh	80 %	1 minutes 23 seconds	12
62	Shreyansh Singh	80 %	1 minutes 32 seconds	12
63	Akarsh	80 %	1 minutes 40 seconds	12
64	Shreyansh Singh	80 %	2 minutes 17 seconds	12
65	Pritha	80 %	2 minutes 41 seconds	12
66	Shreya R Gowda	80 %	3 minutes 14 seconds	12
67	Aakriti	80 %	3 minutes 15 seconds	12
68	pakhee	80 %	3 minutes 18 seconds	12
69	Siva	80 %	3 minutes 31 seconds	12
70	Vinayak	80 %	3 minutes 49 seconds	12
71	ARR	80 %	3 minutes 58 seconds	12
72	Dj	80 %	4 minutes 2 seconds	12
73	Trinay	80 %	4 minutes 2 seconds	12
74	Hariharan	80 %	4 minutes 30 seconds	12
75	Veronica	80 %	4 minutes 31 seconds	12
76	Anishpanday	80 %	5 minutes 5 seconds	12
77	Maliha	80 %	5 minutes 49 seconds	12
78	Ari	80 %	7 minutes 23 seconds	12
79	Raj	80 %	7 minutes 27 seconds	12
80	Ssdddf	80 %	8 minutes 34 seconds	12
81	Rishith	80 %	9 minutes 4 seconds	12
82	Abhinav Singh	80 %	9 minutes 17 seconds	12
83	Sonam	80 %	16 minutes 39 seconds	12
84	De	80 %	1 hours 49 minutes 4 seconds	12
85	Manvi	73 %	1 minutes 26 seconds	11
86	Sri	73 %	1 minutes 44 seconds	11
87	Namrta	73 %	1 minutes 52 seconds	11
88	Rv	73 %	1 minutes 52 seconds	11
89	Ashish	73 %	2 minutes 1 seconds	11
90	Vighneshwari	73 %	2 minutes 10 seconds	11
91	Vcvj	73 %	3 minutes 7 seconds	11
92	u	73 %	3 minutes 7 seconds	11
93	Ishu	73 %	3 minutes 10 seconds	11
94	Shree	73 %	3 minutes 13 seconds	11
95	fire	73 %	3 minutes 17 seconds	11
96	Harsha	73 %	3 minutes 22 seconds	11
97	Vir	73 %	3 minutes 41 seconds	11
98	Dhhritii	73 %	3 minutes 53 seconds	11
99	Akhil yadav	73 %	4 minutes 5 seconds	11
100	Vivek Kumar	73 %	4 minutes 10 seconds	11
101	Vivaan	73 %	4 minutes 32 seconds	11
102	Kj	73 %	4 minutes 43 seconds	11
103	Ravi	73 %	5 minutes 3 seconds	11
104	Priyanshi Yadav	73 %	5 minutes 20 seconds	11
105	Rahi	73 %	5 minutes 20 seconds	11
106	Vaibhav Goel	73 %	5 minutes 34 seconds	11
107	Trinay	73 %	5 minutes 38 seconds	11
108	Shree	73 %	5 minutes 39 seconds	11
109	goluswamy	73 %	5 minutes 45 seconds	11
110	Sahasra Pagidimarri	73 %	5 minutes 45 seconds	11
111	Ghdx	73 %	5 minutes 50 seconds	11
112	jeyvanth	73 %	5 minutes 55 seconds	11
113	Harsha	73 %	5 minutes 58 seconds	11
114	Diksha	73 %	6 minutes	11
115	Ari	73 %	6 minutes 2 seconds	11
116	Aakriti	73 %	6 minutes 4 seconds	11
117	Deepika	73 %	6 minutes 35 seconds	11
118	I	73 %	6 minutes 39 seconds	11
119	GURNOOR	73 %	6 minutes 39 seconds	11
120	golu chaudhry	73 %	6 minutes 51 seconds	11
121	Gaurav Dubey	73 %	7 minutes 34 seconds	11
122	DIYA DIJESH	73 %	7 minutes 49 seconds	11
123	Himanshu	73 %	8 minutes 11 seconds	11
124	F	73 %	8 minutes 13 seconds	11
125	akash	73 %	8 minutes 16 seconds	11
126	Lana	73 %	8 minutes 19 seconds	11
127	Himanshu	73 %	8 minutes 38 seconds	11
128	Preeti	73 %	8 minutes 59 seconds	11
129	jai	73 %	9 minutes 5 seconds	11
130	Pritha	73 %	9 minutes 42 seconds	11
131	Vighneshwari	67 %	1 minutes 50 seconds	10
132	yo	67 %	1 minutes 59 seconds	10
133	Sahil	67 %	2 minutes 41 seconds	10
134	Shreyansh Singh	67 %	3 minutes 5 seconds	10
135	Nikhil	67 %	3 minutes 6 seconds	10
136	M,ydhz	67 %	3 minutes 32 seconds	10
137	Oufwqeufb	67 %	3 minutes 37 seconds	10
138	Arushi	67 %	3 minutes 42 seconds	10
139	Rukhsar	67 %	4 minutes 9 seconds	10
140	Vivek Kumar	67 %	4 minutes 15 seconds	10
141	Dilasa	67 %	4 minutes 25 seconds	10
142	Kritika	67 %	5 minutes 5 seconds	10
143	Nirun	67 %	5 minutes 19 seconds	10
144	Amal Roshna	67 %	5 minutes 20 seconds	10
145	Shabby	67 %	5 minutes 33 seconds	10
146	Sahil	67 %	5 minutes 33 seconds	10
147	Mahi sharma	67 %	5 minutes 41 seconds	10
148	Maya	67 %	6 minutes 12 seconds	10
149	kk	67 %	6 minutes 18 seconds	10
150	A	67 %	6 minutes 39 seconds	10
151	Mamta	67 %	6 minutes 48 seconds	10
152	garima	67 %	6 minutes 57 seconds	10
153	Manvith	67 %	6 minutes 57 seconds	10
154	Anupriya patel	67 %	7 minutes 5 seconds	10
155	Shravya	67 %	7 minutes 29 seconds	10
156	g	67 %	7 minutes 42 seconds	10
157	Adarsh	67 %	8 minutes 20 seconds	10
158	Pritam Ghosh	67 %	9 minutes 32 seconds	10
159	mmm	67 %	13 minutes 16 seconds	10
160	Sneha	67 %	33 minutes 15 seconds	10
161	Samarth	60 %	1 minutes 58 seconds	9
162	Manisha	60 %	2 minutes	9
163	Kashish	60 %	2 minutes 7 seconds	9
164	Aditya dubey	60 %	3 minutes 9 seconds	9
165	Rock it 🤛🏻	60 %	3 minutes 26 seconds	9
166	Saanvi	60 %	3 minutes 29 seconds	9
167	Sahaf ahmad	60 %	3 minutes 33 seconds	9
168	Anne	60 %	3 minutes 34 seconds	9
169	..	60 %	3 minutes 46 seconds	9
170	R	60 %	3 minutes 47 seconds	9
171	Pravin	60 %	4 minutes	9
172	Umar	60 %	4 minutes 4 seconds	9
173	yo	60 %	4 minutes 7 seconds	9
174	Prachi	60 %	4 minutes 12 seconds	9
175	Hsvf	60 %	4 minutes 27 seconds	9
176	YUVRAJ JOGSAN	60 %	4 minutes 27 seconds	9
177	Yashika	60 %	4 minutes 40 seconds	9
178	Komal	60 %	4 minutes 56 seconds	9
179	Sri	60 %	5 minutes 7 seconds	9
180	Shatakshi	60 %	5 minutes 19 seconds	9
181	Avantika	60 %	5 minutes 45 seconds	9
182	Nikhil	60 %	5 minutes 51 seconds	9
183	Gf	60 %	5 minutes 58 seconds	9
184	Aditya yadav	60 %	6 minutes 33 seconds	9
185	Anurag soni	60 %	7 minutes 3 seconds	9
186	Bably kimari	60 %	7 minutes 23 seconds	9
187	Bhoomika	60 %	7 minutes 55 seconds	9
188	Kamini	60 %	7 minutes 58 seconds	9
189	Vaibhav Goel	60 %	8 minutes 6 seconds	9
190	Abhishek	60 %	8 minutes 14 seconds	9
191	Deepesh	60 %	8 minutes 58 seconds	9
192	Prachi verma	60 %	9 minutes 57 seconds	9
193	Shivendra Singh Sengar	60 %	10 minutes 4 seconds	9
194	Anushka	60 %	11 minutes 41 seconds	9
195	Priyanshu	60 %	11 minutes 53 seconds	9
196	Beauty Singh	60 %	14 minutes 45 seconds	9
197	Khushi	60 %	23 minutes 55 seconds	9
198	A	60 %	1 hours 7 minutes 7 seconds	9
199	garima	60 %	6 hours 36 minutes 27 seconds	9
200	Abhinav Singh	53 %	1 minutes 42 seconds	8

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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