Day 152: CBSE Class 10 Science

5 questions. Try each one first, then open its answer.

Question 1
Our Environment. Asked once: 2026 (same type asked 4 times)
6 $In the given figure, identify the trophic level having maximum concentration of harmful chemicals.$
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Question 2
Our Environment. Asked once: 2024 (same type asked 4 times)
33 $Differentiate between food chain and food web. In a food chain consisting of deer, grass and tiger, if the population of deer decreases, what will happen to the population of organisms belonging to the first and third trophic levels ?$
Question 3
Our Environment. Asked once: 2026 (same type asked 4 times)
Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
9 $(\mathrm{O_3})$
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Question 4
The Human Eye and the Colourful World. Asked once: 2025 (same type asked 4 times)
14 $An old person is suffering from an eye defect caused by weakening of ciliary muscles and diminishing flexibility of the eye lens. If the defect of vision is ‘a’ which can be corrected by lens ‘b’, then ‘a’ and ‘b’ respectively are :$
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Question 5
The Human Eye and the Colourful World. Asked once: 2025 (same type asked 4 times)
Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
20 $Assertion (A) : White light is dispersed by a glass prism into seven colours. Reason (R) : The red light bends the least while the violet the most when a beam of white light passes through a glass prism.$
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Question 1

Question 2

Question 3

Question 4

Question 5