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Unformatted text preview: ps D) Root hairs 24. The loss of water from the leaves of plants is A) adhesion. C) transpiration. B) cohesion. D) osmosis. 25) In the water relations of vascular plants, the cohesive property of water is most important in the A) epidermis. C) internal air spaces. B) xylem. D) stomata. 26) What force is responsible for cohesiveness of water? A) osmosis B) hydrogen bonding between water molecules C) negative pressure created by evaporation D) ionic bonding 27) A hot, dry summer will reduce crop yields because A) stomata of the plants stay open to help cool the leaves. B) carbon dioxide uptake is reduced by the stomata closing to prevent excessive water loss. C) oxygen uptake is reduced by the stomata closing to prevent excessive water loss. D) CO2 release is reduced by stomata closing. 28) Pores that facilitate gas exchange in leaves are called A) stomata. C) lenticels. B) guard cells. D) plasmodesmata. 29) Generally speaking, fluids in plants are A) pushed through phloem and pulled through xylem. B) pushed through xylem and pulled through phloem. C) pulled through both xylem and phloem. D) actively pumped throughout the plante 30) Which of the following essential macronutrient for plants is obtained directly from the air? A) nitrogen C) hydrogen B) magnesium D) carbon 31) Micronutrients function in plants mainly as A) joining elements in organic molecule carbon skeletons. B) regulators of membrane transport. C) cofactors in chemical reactions. D) food reserves for pollen grains 32) Which of the following set of plant macronutrients that make up about 98% of a plant's dry weight? A) oxygen, hydrogen, potassium, zinc, and copper B) nitrogen, manganese, sulfur, and phosphorus C) nitrogen, manganese, sulfur, copper, and phosphorus D) carbon, oxygen, hydrogen, nitrogen, sulfur, and phosphorus 33) What are the macronutrients present in most commercial fertilizers? A) C, H, and N C) C, N, and P B) N, P, and K D) N, C, and K 34) Which of the following are important in breaking down organic material in fertile topsoil? A) granite particles C) bacteria and fungi B) humus and cations D) plant roots CHM101 - EXAM 05 35) Nitrogen fixation consists of A) conversion of ammonia to nitrate. B) production of ammonium from organic matter. C) conversion of N2 to ammonia. D) conversion of N2 to ammonia or nitrate 36) Plant and mycorrhizal fungi relationship is; A) parasitic. C) mu...
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