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

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:

Ozone; CFCs

CFCs; Ozone

CFCs; rays UV

UV rays; Diatomic oxygen

2 / 15

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

Herbivores

Producers

Decomposers

Carnivores

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

5 kJ

5000 kJ

500 kJ

50 kJ

4 / 15

Which trophic level is incorrectly defined?

Decomposers – microbial heterotrophs

Herbivores – primary consumers

Omnivores – molds, yeast, and mushrooms

Carnivores – Secondary or tertiary consumers

5 / 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.

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

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.

6 / 15

Why do all food chains start with plants?

Because plants can produce their own energy

Because plants are nutritious

Because plants are easily grown

Because plants do not require energy

7 / 15

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

D and F

B and D

A and B

A and C

8 / 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 unidirectional and the matter is repeatedly circulating

Energy is bidirectional and the matter is repeatedly circulating

9 / 15

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

Polluted air

Water

Less availability of food

Decrease in energy at higher trophic levels

10 / 15

Which of the following features relates to biodegradable substances?

Persist in the environment for long time

Broken down by biological processes

Remain inert

May harm the ecosystem

11 / 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.

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

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:

Pollution

Accumulation

Eutrophication

Biomagnification

13 / 15

The given figure best represents:

food chain in forest, grassland and pond

Food chain in forest, pond, and grassland

Food chain in grassland, pond, and forest

Food chain in forest, grassland, and pond

Food chain in pond, forest, and grassland

14 / 15

Observe the food web and answer the questions given below:

The mussel can be described as

Primary consumer

Secondary consumer

Producers

Decomposer

15 / 15

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

Do not break down organic compounds

Convert organic material to inorganic forms

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

Act at every trophic level of the food chain

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