During photosynthesis, plants release a large amount of oxygen as a by-product while absorbing carbon dioxide. The oxygen produced is much more than what plants use for respiration, so the atmosphere never faces oxygen shortage. CBSE Sample Paper Class 10 Science ...
Category: Class 10 Science
NCERT Solutions for Class 10 Science and important questions for CBSE class 10 for session 2020-2021
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The correct answer is [C] A is true but R is false.The maximum concentration of chemicals and pesticides occurs at the highest trophic level, not the first. These chemicals are non-biodegradable, so they accumulate through the food chain, causing ...
The correct answer is [A] Both A and R are true, and R is the correct explanation of A.The father contributes either an X or Y chromosome. If the child inherits X from father, it becomes XX (girl), and ...
The correct answer is [C] Lead storage battery manufacturing factories near A and soaps and detergents factories near B.Lead storage batteries release acidic waste, making river A acidic. Soaps and detergents factories release basic waste, making river B basic ...
The correct answer is [C] It is used as a refrigerant and in fire extinguishers.That statement is incorrect because ozone is not used as a refrigerant or in fire extinguishers. Instead, CFCs are used as refrigerants and are harmful ...