单项选择题

A growing plant needs water for all of the following except ______.

A．forming sugars
B．sustaining actively growing parts as well as woody stems
C．absorbing mineral elements
D．taking in carbon dioxide from the air
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单项选择题
According to the passage, which of the following statements is TRUE
A．The woody stems contain more water than the leaves.
B．Only part of the carbon dioxide in the plants is synthesized.
C．The mineral elements will not be absorbed by the plant unless dissolved in their roots.
D．Air existing around the leaf is found to be saturated.
单项选择题
The essential function of photosynthesis in terms of plant needs is ______.
A．to derive energy from light
B．to preserve water
C．to combine carbon dioxide with water
D．to form sugars
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