MCQ Questions | Class 10 Science Chapter 15 | Our Environment with Answers

MCQ | Class 10 Science Chapter 15 | Our Environment Set A

Check the below NCERT MCQ Questions for Class 10 Science Chapter 15 Our Environment with Answers Pdf free download. MCQ Questions for Class 10 Science with Answers were prepared based on the latest exam pattern. We have Provided Our Environment Class 10 Science MCQs Questions with Answers to help students understand the concept very well.

Objective Question | Science Class 10 Chapter 15

NCERT Solutions Class 10 Science
Book:	National Council of Educational Research and Training (NCERT)
Board:	Central Board of Secondary Education (CBSE)
Class:	10th
Subject:	Science
Chapter:	15
Chapters Name:	Our Environment
Medium:	English

Class 10th Science Book | Objective Type Questions

You can refer to NCERT Solutions for Class 10 Science Chapter 15 Our Environment to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Our Environment | Class 10 Science | NCERT Solutions

Q1.	Assertion: Vegetarian food habit is more beneficial to organisms. Reason: Only 10% energy is available as food from one trophic level to next.
	A. Both A and R are true and R is the correct explanation of A.
	B. Both A and R are true but R is not the correct explanation of A.
	C. A is true but R is false.
	D. A is false but R is true.

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

Q2.	In natural ecosystems, decomposers include-
	A. only bacteria and fungi
	B. only microscopic animals
	C. herbivores and carnivores
	D. both (b) and (c)

Ans: only bacteria and fungi

Q3.	The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about-
	A. 1%
	B. 8%
	C. 5%
	D. 10%

Ans: 0.01

Q4.	The second trophic level is always of-
	A. herbivores
	B. autotrophs
	C. carnivores
	D. producers

Ans: herbivores

Q5.	The decomposers in an ecosystem-
	A. convert organic material to inorganic forms
	B. convert inorganic material to simpler forms
	C. convert inorganic material into organic compound
	D. do not break down organic compound

Ans: convert organic material to inorganic forms

Q6.	Which of the following is an abiotic component of an ecosystem?
	A. Humus
	B. Bacteria
	C. Plants
	D. Fungi

Ans: Humus

Q7.	What will happen if all the deer are killed in the given food chain? Grass → Deer → Lion
	A. The population of grass decreases.
	B. The population of lions increases.
	C. The population of lions remains unchanged.
	D. The population of lions decreases and grass increases.

Ans: The population of lions decreases and grass increases.

Q8.	Which of the following is not a terrestrial ecosystem-
	A. forest
	B. desert
	C. aquarium
	D. grassland

Ans: aquarium

Q9.	In the garden ecosystem, which of the following are producers?
	A. Insects
	B. Snakes
	C. Grasses
	D. Rabbits

Ans: Grasses

Q10.	Which of the following is biodegradable?
	A. Plastic mugs
	B. Leather belts
	C. Silver foil
	D. Iron nails

Ans: Leather belts

Q11.	Which of the following is an autotroph?
	A. Lion
	B. Insect
	C. Tree
	D. Mushroom

Ans: Tree

Q12.	Which of the following is a logical sequence of food chain
	A. producer → consumer → decomposer
	B. producer → decomposer → consumer
	C. consumer → producer → decomposer
	D. decomposer → producer → consumer

Ans: producer → consumer → decomposer

Q13.	A food chain comprising birds, green plants, fish and man. The concentration of harmful chemical entering the food chain will be maximum in
	A. green plants
	B. man
	C. birds
	D. fish

Ans: man

Q14.	Ozone layer is damaged by-
	A. methane
	B. carbon-dioxide
	C. Sulphur-dioxide
	D. CFCs

Ans: CFCs

Q15.	In an ecosystem, herbivores represent
	A. producers
	B. primary consumers
	C. secondary consumers
	D. decomposers

Ans: primary consumers

Q16.	Which one of the following will undergo fastest bio-degradation?
	A. Mango seed
	B. Wood
	C. Mango peel
	D. Mango pulp

Ans: Mango pulp

Q17.	Assertion: Biodegradable waste and non biodegradable waste should be discarded separately,
	A.Reason: Biodegradable waste are not harmful.
	B. Both A and R are true but R is not the correct explanation of A.
	C. A is true but R is false.
	D. A is false but R is true.

Ans: A is true but R is false.

Q18.	Assertion: Ozone layer is getting depleted at upper atmosphere which is a cause of concern. Reason: CFC reacts with ozone and breaks it.
	A. Both A and R are true and R is the correct explanation of A.
	B. Both A and R are true but R is not the correct explanation of A.
	C. A is true but R is false.
	D. A is false but R is true.