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The incorrect statement about ozone is:
ANSWER: [C] Explanation: The correct answer is [C] It is used as a refrigerant and in fire extinguishers. Ozone is poisonous at ground level. Ozone layer protects from harmful UV rays. Ozone forms when O₂ combines with free O atom (O₃). Refrigerants/fire extinguishers use CFCs, not ozone.
ANSWER: [C]
Explanation: The correct answer is [C] It is used as a refrigerant and in fire extinguishers.
Ozone is poisonous at ground level.
Ozone layer protects from harmful UV rays.
Ozone forms when O₂ combines with free O atom (O₃).
Refrigerants/fire extinguishers use CFCs, not ozone.
See lessSeveral Factories were pouring their wastes in rivers A and B. Water samples were collected from these two rivers. It was observed the sample collected from river A was acidic while that of river B was basic. The factories located near A and B are
ANSWER: [C] Explanation: The correct answer is [C] Lead storage battery manufacturing factories near A and soaps and detergents factories near B. River A → Acidic water → acids come from lead storage battery factories. River B → Basic water → bases/alkalis come from soap and detergent factories. ThuRead more
ANSWER: [C]
Explanation: The correct answer is [C] Lead storage battery manufacturing factories near A and soaps and detergents factories near B.
River A → Acidic water → acids come from lead storage battery factories.
River B → Basic water → bases/alkalis come from soap and detergent factories.
Thus, option C is correct.
See lessQ.8. Assertion (A): The sex of a child in human beings will be determined by the type of chromosome he/she inherits from the father. Reason (R): A child who inherits ‘X’ chromosome from his father would be a girl (XX), while a child who inherits a ‘Y’ chromosome from the father would be a boy (XY).
ANSWER: [A] Explanation: The correct answer is A. Both A and R are true, and R is the correct explanation of A. The sex of a child is determined by the father’s chromosome. Father contributes either X or Y chromosome. XX → girl, XY → boy. Thus, the reason correctly explains the assertion.
ANSWER: [A]
Explanation: The correct answer is A. Both A and R are true, and R is the correct explanation of A.
The sex of a child is determined by the father’s chromosome.
Father contributes either X or Y chromosome.
XX → girl, XY → boy.
See lessThus, the reason correctly explains the assertion.
Q.9. Assertion (A): The maximum concentration of chemicals and pesticides occurs at the first trophic level. Reason (R): The chemical and pesticides are not biodegradable.
ANSWER: [D] Explanation: The correct answer is D. A is false but R is true. Assertion (A) is false → Maximum concentration of pesticides is found at the highest trophic level (top consumers), not the first level. Reason (R) is true → Pesticides are non-biodegradable and accumulate in organisms, causRead more
ANSWER: [D]
Explanation: The correct answer is D. A is false but R is true.
Assertion (A) is false → Maximum concentration of pesticides is found at the highest trophic level (top consumers), not the first level.
Reason (R) is true → Pesticides are non-biodegradable and accumulate in organisms, causing biomagnification.
See lessPlants release oxygen during photosynthesis but also consume oxygen during respiration. Why does the atmosphere not face oxygen shortage because of this?
Plants carry out both photosynthesis and respiration, but the amount of oxygen released during photosynthesis is far greater than the amount consumed during respiration. In photosynthesis, plants release large volumes of oxygen as a by-product while producing glucose. Although they use some oxygen fRead more
Plants carry out both photosynthesis and respiration, but the amount of oxygen released during photosynthesis is far greater than the amount consumed during respiration. In photosynthesis, plants release large volumes of oxygen as a by-product while producing glucose. Although they use some oxygen for their own energy needs during respiration, this is comparatively very small. Additionally, the vast number of plants on Earth constantly replenish the atmosphere with oxygen. Hence, the overall balance ensures no shortage of oxygen in the atmosphere.
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