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
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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?

It will depend on the type of the terrestrial plant

10,000 J

100 J

1000 J

2 / 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

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

Act at every trophic level of the food chain

Do not break down organic compounds

3 / 15

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

Producers

Decomposers

Carnivores

Herbivores

4 / 15

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

Reason: The flow of energy is unidirectional.

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

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.

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.

A is false but R is true.

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

A is true but R is false.

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

6 / 15

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

A and C

B and D

D and F

A and B

7 / 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:

Biomagnification

Pollution

Eutrophication

Accumulation

8 / 15

Observe the food web and answer the questions given below:

The mussel can be described as

Primary consumer

Decomposer

Producers

Secondary consumer

9 / 15

Which trophic level is incorrectly defined?

Omnivores – molds, yeast, and mushrooms

Carnivores – Secondary or tertiary consumers

Decomposers – microbial heterotrophs

Herbivores – primary consumers

10 / 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

5 kJ

500 kJ

11 / 15

Why do all food chains start with plants?

Because plants are nutritious

Because plants are easily grown

Because plants can produce their own energy

Because plants do not require energy

12 / 15

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

Grass → Deer → Tiger

The population of grass decreases

The population of tigers increases

The population of tigers decreases and the population of grass increases

Tiger will start eating grass

13 / 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 false, but R is true.

A is true, but R is false.

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

14 / 15

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

Water

Less availability of food

Polluted air

Decrease in energy at higher trophic levels

15 / 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

Ozone; CFCs

UV rays; Diatomic oxygen

CFCs; Ozone

Your score is

The average score is 60%

Leaderboard – Top Scorers

Check out the highest scorers below!

Pos.	Name	Score	Duration	Points
1	PRO_LINGS	100 %	34 seconds	15
2	Dark kani	100 %	42 seconds	15
3	Vishwagna	100 %	48 seconds	15
4	Anakha Nithesh	100 %	49 seconds	15
5	Vishwagna	100 %	53 seconds	15
6	Anakha Nithesh	100 %	55 seconds	15
7	Tanisha	100 %	1 minutes 10 seconds	15
8	Priya	100 %	1 minutes 10 seconds	15
9	PRO_LINGS	100 %	1 minutes 12 seconds	15
10	Kumkum	100 %	1 minutes 12 seconds	15
11	Kumkum	100 %	1 minutes 12 seconds	15
12	Abhinav	100 %	1 minutes 23 seconds	15
13	deepasree vs	100 %	1 minutes 25 seconds	15
14	Sa	100 %	1 minutes 26 seconds	15
15	Ay	100 %	1 minutes 36 seconds	15
16	Varun	100 %	1 minutes 37 seconds	15
17	Priya Singh	100 %	1 minutes 42 seconds	15
18	Priya Singh	100 %	1 minutes 47 seconds	15
19	varun	100 %	1 minutes 47 seconds	15
20	Nirun	100 %	1 minutes 51 seconds	15
21	Anmol	100 %	2 minutes 2 seconds	15
22	Manu Manvith	100 %	2 minutes 5 seconds	15
23	Veer	100 %	2 minutes 9 seconds	15
24	,,,,	100 %	2 minutes 10 seconds	15
25	Arjun	100 %	2 minutes 20 seconds	15
26	atg	100 %	2 minutes 27 seconds	15
27	Manvith	100 %	3 minutes 1 seconds	15
28	Shree	100 %	3 minutes 23 seconds	15
29	Pritha	100 %	3 minutes 33 seconds	15
30	vinay	100 %	4 minutes 59 seconds	15
31	varun	100 %	5 minutes 38 seconds	15
32	Priya Singh	100 %	8 minutes 17 seconds	15
33	anakha	93 %	1 minutes 10 seconds	14
34	Raks	93 %	1 minutes 27 seconds	14
35	Prashant Kumar Rai (VIII-C)	93 %	1 minutes 27 seconds	14
36	Akarsh	93 %	1 minutes 30 seconds	14
37	Vivian	93 %	1 minutes 35 seconds	14
38	Priya	93 %	2 minutes 8 seconds	14
39	Varun	93 %	2 minutes 8 seconds	14
40	Priya Singh	93 %	2 minutes 12 seconds	14
41	Abhimanyu	93 %	2 minutes 16 seconds	14
42	cftr	93 %	2 minutes 17 seconds	14
43	Priya Singh	93 %	2 minutes 25 seconds	14
44	Ashish	93 %	2 minutes 34 seconds	14
45	/	93 %	2 minutes 37 seconds	14
46	Judith	93 %	2 minutes 46 seconds	14
47	Nirun	93 %	2 minutes 46 seconds	14
48	Mahi	93 %	2 minutes 52 seconds	14
49	Harshita	93 %	3 minutes 11 seconds	14
50	.	93 %	3 minutes 22 seconds	14
51	Gaurav	93 %	5 minutes 19 seconds	14
52	Priya Singh	93 %	7 minutes 1 seconds	14
53	Rudransh	93 %	9 minutes 22 seconds	14
54	Sivangi	93 %	10 minutes 51 seconds	14
55	Iqra Nafees	93 %	12 minutes 20 seconds	14
56	varun	93 %	31 minutes 21 seconds	14
57	Diya	87 %	1 minutes 8 seconds	13
58	arifa	87 %	1 minutes 9 seconds	13
59	Navdeep	87 %	1 minutes 11 seconds	13
60	Navdeep Singh	87 %	1 minutes 21 seconds	13
61	Jkl	87 %	1 minutes 39 seconds	13
62	ko	87 %	1 minutes 46 seconds	13
63	aadhya	87 %	1 minutes 51 seconds	13
64	Hi	87 %	1 minutes 57 seconds	13
65	Shabby	87 %	2 minutes 8 seconds	13
66	Amal Roshna	87 %	2 minutes 9 seconds	13
67	Soumya	87 %	2 minutes 15 seconds	13
68	Uttara Soni	87 %	2 minutes 15 seconds	13
69	Anaya	87 %	2 minutes 45 seconds	13
70	Varun	87 %	3 minutes	13
71	.	87 %	3 minutes 11 seconds	13
72	Mittal	87 %	3 minutes 16 seconds	13
73	Kajal	87 %	3 minutes 16 seconds	13
74	Cc	87 %	3 minutes 18 seconds	13
75	Anushka	87 %	3 minutes 19 seconds	13
76	Anmol	87 %	3 minutes 22 seconds	13
77	golu chaudhry	87 %	3 minutes 24 seconds	13
78	Nirjara	87 %	3 minutes 33 seconds	13
79	bholu	87 %	3 minutes 38 seconds	13
80	A	87 %	3 minutes 56 seconds	13
81	Anu	87 %	3 minutes 58 seconds	13
82	vishal	87 %	4 minutes 6 seconds	13
83	Praveen	87 %	4 minutes 11 seconds	13
84	Abhishek Kumar	87 %	4 minutes 15 seconds	13
85	Judith	87 %	4 minutes 46 seconds	13
86	Shalu	87 %	4 minutes 52 seconds	13
87	09	87 %	5 minutes 13 seconds	13
88	M	87 %	5 minutes 36 seconds	13
89	Shraddha	87 %	5 minutes 36 seconds	13
90	gfyfyt	87 %	5 minutes 57 seconds	13
91	Harahul	87 %	6 minutes 26 seconds	13
92	Hh	87 %	8 minutes 5 seconds	13
93	H	87 %	8 minutes 11 seconds	13
94	Gg	87 %	10 minutes 57 seconds	13
95	z	87 %	16 minutes 37 seconds	13
96	akki	87 %	17 minutes 41 seconds	13
97	Sadrul	80 %	1 minutes 3 seconds	12
98	Diya	80 %	1 minutes 10 seconds	12
99	Sadrul	80 %	1 minutes 17 seconds	12
100	Akarsh	80 %	1 minutes 23 seconds	12
101	Aditya	80 %	1 minutes 29 seconds	12
102	Shreyansh Singh	80 %	1 minutes 32 seconds	12
103	Akarsh	80 %	1 minutes 40 seconds	12
104	Tanisha	80 %	2 minutes	12
105	Vignesh	80 %	2 minutes 6 seconds	12
106	Shreyansh Singh	80 %	2 minutes 17 seconds	12
107	Pritha	80 %	2 minutes 41 seconds	12
108	Shreya R Gowda	80 %	3 minutes 14 seconds	12
109	Aakriti	80 %	3 minutes 15 seconds	12
110	pakhee	80 %	3 minutes 18 seconds	12
111	Siva	80 %	3 minutes 31 seconds	12
112	Vinayak	80 %	3 minutes 49 seconds	12
113	ARR	80 %	3 minutes 58 seconds	12
114	Dj	80 %	4 minutes 2 seconds	12
115	Trinay	80 %	4 minutes 2 seconds	12
116	Hariharan	80 %	4 minutes 30 seconds	12
117	Veronica	80 %	4 minutes 31 seconds	12
118	Anishpanday	80 %	5 minutes 5 seconds	12
119	Maliha	80 %	5 minutes 49 seconds	12
120	A	80 %	6 minutes 4 seconds	12
121	Saachi Singhal	80 %	6 minutes 23 seconds	12
122	Ari	80 %	7 minutes 23 seconds	12
123	Raj	80 %	7 minutes 27 seconds	12
124	Ssdddf	80 %	8 minutes 34 seconds	12
125	marathi mulga	80 %	8 minutes 54 seconds	12
126	Rishith	80 %	9 minutes 4 seconds	12
127	Abhinav Singh	80 %	9 minutes 17 seconds	12
128	Sonam	80 %	16 minutes 39 seconds	12
129	De	80 %	1 hours 49 minutes 4 seconds	12
130	Sadrul	73 %	1 minutes 15 seconds	11
131	Manvi	73 %	1 minutes 26 seconds	11
132	Kumkum	73 %	1 minutes 33 seconds	11
133	Sri	73 %	1 minutes 44 seconds	11
134	Namrta	73 %	1 minutes 52 seconds	11
135	Rv	73 %	1 minutes 52 seconds	11
136	Ashish	73 %	2 minutes 1 seconds	11
137	Vighneshwari	73 %	2 minutes 10 seconds	11
138	Saghanaaaaa	73 %	2 minutes 10 seconds	11
139	Vcvj	73 %	3 minutes 7 seconds	11
140	u	73 %	3 minutes 7 seconds	11
141	Ishu	73 %	3 minutes 10 seconds	11
142	Shree	73 %	3 minutes 13 seconds	11
143	fire	73 %	3 minutes 17 seconds	11
144	Harsha	73 %	3 minutes 22 seconds	11
145	Vir	73 %	3 minutes 41 seconds	11
146	Dhhritii	73 %	3 minutes 53 seconds	11
147	Akhil yadav	73 %	4 minutes 5 seconds	11
148	Vivek Kumar	73 %	4 minutes 10 seconds	11
149	Vivaan	73 %	4 minutes 32 seconds	11
150	Kj	73 %	4 minutes 43 seconds	11
151	Ravi	73 %	5 minutes 3 seconds	11
152	Uttara Soni	73 %	5 minutes 13 seconds	11
153	Priyanshi Yadav	73 %	5 minutes 20 seconds	11
154	Rahi	73 %	5 minutes 20 seconds	11
155	Vaibhav Goel	73 %	5 minutes 34 seconds	11
156	Trinay	73 %	5 minutes 38 seconds	11
157	Shree	73 %	5 minutes 39 seconds	11
158	goluswamy	73 %	5 minutes 45 seconds	11
159	Sahasra Pagidimarri	73 %	5 minutes 45 seconds	11
160	Ghdx	73 %	5 minutes 50 seconds	11
161	jeyvanth	73 %	5 minutes 55 seconds	11
162	Harsha	73 %	5 minutes 58 seconds	11
163	Diksha	73 %	6 minutes	11
164	Ari	73 %	6 minutes 2 seconds	11
165	Aakriti	73 %	6 minutes 4 seconds	11
166	ko	73 %	6 minutes 18 seconds	11
167	From e-Techno Borivali	73 %	6 minutes 33 seconds	11
168	Deepika	73 %	6 minutes 35 seconds	11
169	I	73 %	6 minutes 39 seconds	11
170	GURNOOR	73 %	6 minutes 39 seconds	11
171	golu chaudhry	73 %	6 minutes 51 seconds	11
172	Sneha	73 %	7 minutes 6 seconds	11
173	Gaurav Dubey	73 %	7 minutes 34 seconds	11
174	DIYA DIJESH	73 %	7 minutes 49 seconds	11
175	Deepasree vs	73 %	8 minutes 10 seconds	11
176	Himanshu	73 %	8 minutes 11 seconds	11
177	F	73 %	8 minutes 13 seconds	11
178	akash	73 %	8 minutes 16 seconds	11
179	Lana	73 %	8 minutes 19 seconds	11
180	Arjun	73 %	8 minutes 23 seconds	11
181	Himanshu	73 %	8 minutes 38 seconds	11
182	Preeti	73 %	8 minutes 59 seconds	11
183	jai	73 %	9 minutes 5 seconds	11
184	Pritha	73 %	9 minutes 42 seconds	11
185	bamba	73 %	11 minutes 47 seconds	11
186	samruth	73 %	14 minutes 18 seconds	11
187	Vighneshwari	67 %	1 minutes 50 seconds	10
188	yo	67 %	1 minutes 59 seconds	10
189	Kumkum	67 %	2 minutes 15 seconds	10
190	Sahil	67 %	2 minutes 41 seconds	10
191	Shreyansh Singh	67 %	3 minutes 5 seconds	10
192	Nikhil	67 %	3 minutes 6 seconds	10
193	Jemimah	67 %	3 minutes 9 seconds	10
194	M,ydhz	67 %	3 minutes 32 seconds	10
195	Oufwqeufb	67 %	3 minutes 37 seconds	10
196	Arushi	67 %	3 minutes 42 seconds	10
197	tanisha	67 %	3 minutes 54 seconds	10
198	Rukhsar	67 %	4 minutes 9 seconds	10
199	Babulal	67 %	4 minutes 11 seconds	10
200	Raksha	67 %	4 minutes 14 seconds	10

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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Also See: Life Processes Class 10 Notes: Simplified and Easy to Understand

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