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most of the mass of organic material of a plant comes from

carbon dioxide

micronutrients are needed in very small amounts because

most serve mainly as cofactors of enzymes

the rhizosphere would best described as

soil that is bound to roots and differs from the surrounding soil in containing many more microbes

some of the problems associated with intensive irrigation include all but

overfertilization

a mineral deficiency is likely to affect older leaves more then younger leaves if

the mineral is very mobile within the plant

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 compared to those of the plants grown in humus-enriched soil. The best explanation for this difference is that

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

the specific relationship between a legume and thats mutualistic rhizobium strain probably dpends on

specific recognition between the chemical signals and signal receptors af the thizobium strain and legume species

mycorrhizae enhance plant nutrition mainly by

absorbing water and minerals through the fungal hyphae

two plants one with mycorrhizae and one without would differ greatest in health in an environment that

in which the soil is relatively deficient in mineral nutrients

carnivorous adaptations of plants mainly compensate for soil that has a relatively low content of

nitrogen

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