Question

for questions 28 to 32, read each question carefully. decide which of the choices best completes the statement. place your answer in the blank space given. 28. it is most effective to water a lawn a. early in the evening b. early in the morning c. in the afternoon d. anytime during the day 29. the carbon cycle begins with the process of a. cellular respiration b. oxidation c. photosynthesis d. transpiration 30. a growing forest is valuable because it a. removes carbon dioxide from the atmosphere b. releases carbon dioxide into the atmosphere c. removes methane from the atmosphere d. uses oxygen from the atmosphere 31. in the oxygen cycle, oxygen is a. added to and removed from the atmosphere by photosynthesis b. added to the atmosphere by decomposers and removed by photosynthesis c. added to the atmosphere by cellular respiration and removed by photosynthesis d. added to the atmosphere by photosynthesis and removed by cellular respiration and combustion © 2006 alberta education science 20: unit d 9 assignment booklet d1 32. a farmer plants alfalfa (a type of legume) to add nitrogen to the soil on his farm. the process through which nitrogen gas is converted into ammonia is known as a. denitrification b. nitrification c. nitrogen fixation d. fertilizing 33. match each description with the appropriate term listed. place your answer in the blank space given. i. nitrification ii. carbon sink iii. ozone iv. biogeochemical cycle v. denitrification vi. nitrifying bacteria vii. transpiration viii. humidity a. a series of chemical reactions involved in the movement of elements and compounds between living and non - living components of an ecosystem b. a system that removes more carbon dioxide from the atmosphere than it returns c. the atmospheres moisture content d. the process of converting ammonia into nitrates or nitrites e. a molecule comprised of three oxygen atoms f. a type of soil bacteria that converts ammonia into nitrates and nitrites g. the loss of water vapour from a plant through its leaves h. the process of converting nitrates in the soil into nitrogen gas

Explanation:

• Question 28: Early morning watering allows water to penetrate soil before evaporation (due to lower heat and wind).
• Question 29: Photosynthesis (plants take in \(CO_2\)) is the start of the carbon cycle.
• Question 30: Forests (trees) absorb \(CO_2\) via photosynthesis.
• Question 31: Photosynthesis adds \(O_2\) (as a by - product), cellular respiration and combustion use \(O_2\).
• Question 32: Nitrogen fixation converts \(N_2\) to ammonia.
• Question 33a: Biogeochemical cycle involves element/compound movement.
• Question 33b: Carbon sink absorbs more \(CO_2\) than it releases.
• Question 33c: Humidity is moisture content.
• Question 33d: Nitrification converts ammonia to nitrates/nitrites.
• Question 33e: Ozone has three oxygen atoms (\(O_3\)).
• Question 33f: Nitrifying bacteria do the ammonia - to - nitrate/nitrite conversion.
• Question 33g: Transpiration is water vapour loss from plants.
• Question 33h: Denitrification converts nitrates to \(N_2\).

Answer:

1. B. early in the morning
2. C. photosynthesis
3. A. removes carbon dioxide from the atmosphere
4. D. added to the atmosphere by photosynthesis and removed by cellular respiration and combustion
5. C. nitrogen fixation

33a. iv. biogeochemical cycle
33b. ii. carbon sink
33c. viii. humidity
33d. i. nitrification
33e. iii. ozone
33f. vi. nitrifying bacteria
33g. vii. transpiration
33h. v. denitrification