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431. 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) : Water loss from plants is at a minimum during darkness. Reason (R) : Movements of stomata normally depend on light intensity.
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:
432. Water in rural areas is disinfected by
A. sodium chloride
B. chlorine
C. potassium permanganate
D. sodium sulphate
Explanation:
433. Which of the following is the hardest metal ?
A. Iron
B. Copper
C. Platinum
D. Tungsten
Explanation:
434. All the following noble gases are present in the atmosphere except
A. argon
B. helium
C. radon
D. xenon
Explanation:
435. The neutral atoms two isotopes differ in the number of
A. electron shells
B. protons
C. calence electrons
D. neutrons
Explanation:
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