ANSWER: [D] Explanation: The correct answer is [D] 100% tall with round seeds. Genotype of parents → TTRR × ttrr. F₁ offsprings get one dominant allele from tall-round parent and one recessive from short-wrinkled. So all F₁ = TtRr (tall and round), showing dominant traits.
ANSWER: [D]
Explanation: The correct answer is [D] 100% tall with round seeds.
Genotype of parents → TTRR × ttrr. F₁ offsprings get one dominant allele from tall-round parent and one recessive from short-wrinkled.
So all F₁ = TtRr (tall and round), showing dominant traits.
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.
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.
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.
Thus, the reason correctly explains the assertion.
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.
A tall pea plant with round seeds (TTRR) is crossed with a short pea plant with wrinkled seeds (ttrr). The F₁ generation will be:
ANSWER: [D] Explanation: The correct answer is [D] 100% tall with round seeds. Genotype of parents → TTRR × ttrr. F₁ offsprings get one dominant allele from tall-round parent and one recessive from short-wrinkled. So all F₁ = TtRr (tall and round), showing dominant traits.
ANSWER: [D]
Explanation: The correct answer is [D] 100% tall with round seeds.
Genotype of parents → TTRR × ttrr. F₁ offsprings get one dominant allele from tall-round parent and one recessive from short-wrinkled.
See lessSo all F₁ = TtRr (tall and round), showing dominant traits.
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 less