Our Environment: Class 10 Science (CBSE) important questions and practice
Our Environment is chapter 13 of 13 in CBSE Class 10 Science. Below are the topics the paper draws from, the question types that come up again and again, and a free practice test on this chapter alone.
Topics in this chapter
- Ecosystem: biotic and abiotic components
- Food chains, food webs and trophic levels
- Flow of energy and the 10 percent law
- Biological magnification
- Ozone layer depletion and CFCs
- Waste management: biodegradable and non-biodegradable substances
What examiners usually ask
- What is the 10 percent law? If 10,000 J of energy is available at the producer level, how much reaches the third trophic level?
- Why are harmful pesticides found in the highest concentration in human beings in a food chain?
- How is ozone formed in the upper atmosphere and why is its depletion a concern?
Exam tip
The energy-flow numerical and biological magnification are the two most repeated items; remember that energy flow is unidirectional and that a food chain rarely exceeds four trophic levels because of the 10 percent law.
Our Environment on other boards and exams
Frequently asked questions
What are the important questions from Our Environment for CBSE Class 10?
The question types listed above repeat most often in CBSE Class 10 Science papers for this chapter. Practise them with the chapter test and then attempt them inside a full previous-year paper under time.
Is Our Environment in the CBSE Class 10 Science syllabus?
Yes. Our Environment is part of the current CBSE Class 10 Science syllabus, as listed on this site from the prescribed textbook.
Can I practise Our Environment MCQs in Hindi?
Yes. The chapter test and explanations are available in Hindi and English, with an AI doubt solver for any question.