Teaching Bihar STET Paper 1 (माध्यमिक) Mock Test 2024 General Knowledge Ecology and Environment Environment Problems
The following is true about ozone:
(A) It is essential for respiration of animals and plants.
(B) It absorbs ultraviolet rays.
(C) Its percentage in air is almost 3%.
(D) It is used to disinfect water.
1
A, B and C
2
B and D
3
Only B
4
A and D