Passage 60 - Structure of Sugar
Atoms of carbon, hydrogen and oxygen are put together to make molecules of sugar -a
carbohydrate food substance. The carbon comes from carbon dioxide gas in the air. Air
enters
through holes, called stomata, in the plant's leaves. The hydrogen and oxygen
come from water. The water is taken up from the soil by the plant's roots. The light
energy is trapped by a special chemical called chlorophyll. Chlorophyll is green and
gives green plants their color. The gas oxygen is left over at the end of photosynthesis
and goes into the air.
1. It is clear in the passage that ----.
A) all the gases come from the air through the stomata
B) plants' seeming green is owing to a substance called chlorophyll
C) the water is split up by a chemical reaction in the plant's leaves
D) the carbon enters the plant by means of its roots
E) the only outcome
of photosynthesis is oxygen
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