Question

1. which of the following statements about ground water is true? a. it stays underground for a few days. b. it is stored in underground caverns or porous rock. c. it is salty like ocean water. d. it never reenters the water cycle. 10. which of the following processes produces carbon dioxide? a. decomposition c. combustion b. respiration d. all of the above 11. during nitrogen fixation, nitrogen gas is converted into a form that _? can use. a. plants c. fungi b. animals d. all of the above 12. bacteria are essential to a. combustion. c. nitrogen fixation. b. photosynthesis. d. evaporation. 13. the pioneer species on bare rock are usually a. ferns. c. mosses. b. pine trees. d. lichens.

Explanation:

• Question 9: Groundwater is stored in underground caverns or porous rock. It can stay underground for long - periods, is generally fresh, and does re - enter the water cycle.
• Question 10: Decomposition, respiration, and combustion all produce carbon dioxide. Decomposition breaks down organic matter releasing CO2, respiration is the process by which organisms release CO2 as a by - product, and combustion of organic materials also releases CO2.
• Question 11: During nitrogen fixation, nitrogen gas is converted into a form (such as ammonia or nitrates) that plants can use to build proteins and other nitrogen - containing compounds.
• Question 12: Bacteria play a crucial role in nitrogen fixation. Some bacteria can convert atmospheric nitrogen into a form usable by plants.
• Question 13: Lichens are often the pioneer species on bare rock. They can break down the rock and start the process of soil formation.

Answer:

1. B. It is stored in underground caverns or porous rock.
2. D. all of the above
3. A. plants
4. C. nitrogen fixation
5. D. lichens