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421. Given below are two statements, labeled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ? 1. Assertion (A) : Some bacteria can synthesise their own food. 2. Reason (R) : These bacteria have chloroplasts.
A. Both A and R are true but R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Explanation:
422. Given below are two statements, labeled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ?Assertion (A) : Red phosphorus is used in match sticks.Reason (R) : Red phosphorus is less dangerous compared to white.
A. Both A and R are true but R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Explanation:
423. Given below are two statements, labeled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ?Assertion (A) : Bats can fly in the dark.Reason (R) : Bats navigate using ultrasonic sound waves.
A. Both A and R are true but R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Explanation:
424. Which of the following fibres is generally preferred for making gauze and lint ?
A. Cotton
B. Rayon
C. Nylon
D. Terylene
Explanation:
425. Given below are two statements, labelled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ?Assertion (A) : Radioactive decay is a spontaneous process.Reason (R) : The rate of radioactive decay depends upon the chemical environment.
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Explanation:
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