51.

Night blindness is cause by lack of which vitamin?
A. Vitamin A B. Vitamin B
C. Vitamin C D. Vitamin D
Answer and Explanation
Answer:A
Explanation: No answer description available for this question.
52.

Monocot root differs from dicot root in having
A. open vascular bundles B. scattered vascular bundles
C. well developed pith D. radially arranged vascular bundles
Answer and Explanation
Answer:C
Explanation: No answer description available for this question.
53.

Radioactivity is a phenomenon of the spontaneous emission of
A. protons (alpha particles) B. electrons (beta particles)
C. gamma rays (short wave electromagnetic waves) D. All of the above
Answer and Explanation
Answer:D
Explanation: No answer description available for this question.
54.

Organic Substances which, in very small amounts, control growth and development called
A. vitamins B. hormones
C. enzymes D. None of the above
Answer and Explanation
Answer:B
Explanation: No answer description available for this question.
55.

Our major foods, fibres, spices, fruits and beverage crops are
A. flowering plants B. gymnosperms plants
C. pteridophytes D. bryophytes
Answer and Explanation
Answer:A
Explanation: No answer description available for this question.