A plant does not obtain which of the following substances from soil? a magnesium

Question

A plant does not obtain which of the following substances from soil? a magnesium b. nitrogen c. carbon d. oxygen e. phosphorus Micronutrients are needed in very small amounts because a. most micronutrients are supplied in large enough quantities in seeds b. only the growing regions of the plants require micronutrients. c. they play only a minor role in the growth and health of the plant. d. most function as cofactors or enymes. e. most of them are mobile in the plant. Topsoil a. is the relatively inert upper layer of soil. b. does not retain water. c. is a mixture of rock fragments, living organisms, and humus. d. is uniform in texture. e. is devoid of charged particles. Soil can easily become deficient in ___, because these ions are negatively charged and do not stick to negatively charged clay particles. a potassium b. calcium. c. magnesium. d. nitrate e ammonium. Fertilizers are usually enriched in a iron, manganese, and zinc. b. calcium, boron, and carbon. c nitrogen, phosphorus, and potassium. d molybdenum, copper, and magnesium e all essential nutrients. Nitrogen-fixing bacteria in the soil a convert nitrates to N_2. b. convert ammonia into ammonium. c. convert atmospheric nitrogen into ammonia d. change ammonium into nitrates. e. use nitrates to make amino acids that plants can use. A mineral deficiency is likely to affect older leaves more than younger leaves if a. the mineral is a macronutrient. b the mineral is very mobile within the plant. c. the mineral is a micronutrient. d. the older leaves are in direct sunlight e. the mineral is required for chlorophyll synthesis. The relationship between legumes and Rhizobium is a. mutualistic b. parasitic c. competitive. d. commensalism. e predation. Mycomhizac a nutrients required by plants in relatively small amounts b. modium-sized soil particles. c plants such as mistletoe parasitize other plants. d associations of roots benefic fungi. e. cells that control evaporation of water from leaves. Carnivorous adaptations of plants mainly compensate for soil that has a relatively low content of a. calcium b. water. c. nitrogen d. phosphate. e. potassium. a. abscisic acid b. ouxin c. cytokinim d giberellins e. ethylene Mobilize stoned nutrients in seeds, cause increase in stem elongation Gas hormone that promotes ripening of fruits Control growth by cell division Shuts down or inhibits plant activity (growth) Applied by fruit shippers to speed up ripening Enhances apical dominance

Explanation / Answer

1. A plant does not obtain which of the following substances from soil? Carbon

y:Carbon is obtained from atmospheric CO2.

2.  Micronutrients are needed in very small amounts because most serve mainly as cofactors of enzymes.

3.Topsoil is a mixture of rock fragments, living organisms, and humus.

y:Topsoil is produced by the erosion of rock by living organisms and is rich in decomposing organic matter (humus).

4.Soil can easily become deficient in nitrate, because these ions are negatively charged and do not stick to negatively charged clay particles.
y:Nitrate, NO3 -, is negatively charged and not tightly bound to soil particles

5.Fertilizers are usually enriched in  nitrogen, phosphorus, and potassium.

y:It is because farm and garden soils are most likely to be deficient in these macronutrients

6.Nitrogen-fixing bacteria in the soil convert atmospheric nitrogen into ammonia

y:Nitrogen fixation is the conversion of N2. (atmospheric nitrogen) to NH3 (ammonia). Ammonia picks up an hydrogen ion from the soil to form NH4 + (ammonium) which can then be absorbed by plants.

7.A mineral deficiency is likely to affect older leaves more than younger leaves if the mineral is very mobile within the plant.

8.. The relationship between legumes and Rhizobium is mutualistic

y:Both the legume and the Rhizobium benefit from this relationship. The legume gain a supply of fixed nitrogen from Rhizobium, and Rhizobium gains organic nutrients from the legume.

9.Mycorrhizae are associations of roots with beneficial fungi.

y:Mycorrhizae are modified roots consisting of a mutualistic association of roots and fungi.

10.Carnivorous adaptations of plants mainly compensate for soil that has a relatively low content of nitrogen

utualistic

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.