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Two groups of tomatoes were grown under ...

Two groups of tomatoes were grown under laboratory conditions, one with humus added to the soil and one a control without humus. The leaves of the plants grown without humus were yellowish (less green) compared with those of the plants grown in humus-enriched soil. The best explanation for this difference is that

A

the healthy plants used the food in the decomposing leaves of the humus for energy to make chlorophyll.

B

the humus made the soil more loosely packed, so water penetrated more easily to the roots.

C

the humus contained minerals such as magnesium and iron, needed for the synthesis of chlorophyll.

D

the heat released by the decomposing leaves of the humus caused more rapid growth and chlorophyll synthesis.

Text Solution

Verified by Experts

The correct Answer is:
C
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