BSC1005 Broward College ch32 Exam review

The sugar sink in roots is the result of 19 a pull of

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19) The sugar "sink" in roots is the result of 19) A) pull of gravity on sugar molecules. B) active transport of sugars from phloem to root cells. C) active transport of mineral ions into xylem cells. D) absorption of water from the soil through epidermal cells. 20) The existence of a hydrostatic pressure gradient in phloem tubes can be accounted for by 20) 21) How do sugars move from one sieve - tube cell to the next? 21) 22) Which of the following essential macronutrient for plants is obtained directly from the air? 22) 23) Micronutrients function in plants mainly as 23) A) regulators of membrane transport. B) food reserves for pollen grains. C) cofactors in chemical reactions. D) joining elements in organic molecule carbon skeletons. 24) Which of the following options lists the set of plant macronutrients that make up about 98% of a plant's dry weight? 24) 25) What are the macronutrients present in most commercial fertilizers? 25) 26) A fertilizer with which of the following nitrogen - phosphorous - potassium ratios would most likely solve the problem of yellowed leaves and stunted growth? 26) 3
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27) Which of the following are important in breaking down organic material in fertile topsoil? 27) A) bacteria and fungi B) plant roots C) humus and cations D) abrasive granite particles 28) If you examine the soil profile revealed by a fresh road cut through a grassy rise, which of the following features will you probably find in the B horizon? 28)
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