LDC QUESTIONS 13

SCIENCE OF OLD AGE
GERENTOLOGY

ANTI TUBERCULOSIS VACCINE
BCG

DRY ICE
SOLID CARBON DIOXIDE

GREEN PIGMENT IN PLANT LEAF
CHLOROPHYL

ALZHEIMER DAY OBSERVED IN
SEPTEMBER 21

ASTRONOMICAL MEASURE OF DISTANCE
LIGHT YEAR

NATURE AND PROPERTIES OF LIGHT
OPTICS

POMOLOGY IS THE STUDY OF
FRUITS

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