Chapter 37: Q37.1-4CC (page 807)
Note three ways the properties of water contribute to soil formation.
Short Answer
The water properties contributing to soil formation are expansion upon freezing, property of cohesion, and polarity.
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Chapter 37: Q37.1-4CC (page 807)
Note three ways the properties of water contribute to soil formation.
The water properties contributing to soil formation are expansion upon freezing, property of cohesion, and polarity.
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Mycorrhizae enhance plant nutrition mainly by
(A) absorbing water and minerals through the fungal hyphae.
(B) providing sugar to root cells, which have no chloroplasts.
(C) converting atmospheric nitrogen to ammonia.
(D) enabling the roots to parasitize neighboring plants.
Based on Figure 9.17, explain why hydroponically grown plants would grow much more slowly if they were not sufficiently aerated.


The inorganic nutrient most often lacking in crops is
(A) carbon.
(B) nitrogen.
(C) phosphorus.
(D) potassium
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 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.
Are some essential elements more important than others? Explain.
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