The optimum range for most crops growing in a soilless medium is _____________ -_____________ , because in this range micronutrients are _____________ enough to satisfy plant needs without becoming so _____________ as to be toxic)
a) 7.35, 7.45, soluble, soluble
b) 5.8, 6.4, soluble, soluble
c) 5.14, 5.75, insoluble, insoluble
d) 7.35, 7.45, insoluble, soluble
Answer: b) 5.8, 6.4, soluble, soluble
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Biology
- The osmoregulatory/excretory system of a freshwater flatworm is based on the operation of _____.
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- Amino acids whose degradation yields succinyl-CoA includes all of the following except ________.
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- The fixation of nitrogen requires _______.
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- All of the following are directly involved in the synthesis of deoxyribonucleic acid except _______.
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- SAM is a methyl donor in the synthesis of ______.
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- All of the following are purine bases except _____.