8. Most plants open their stomata during the day when light is available for photosynthesis tofavor CO2 diffusion and then close them at night to conserve water. However, plants such asthe saguaro cactus (pictured) actually open their stomata at night to fix carbon and undergoalternative photosynthetic reactions during the day instead of capturing sunlight for light-dependent reactions. This is an adaptation to conserve water in desert climates. With this inmind...a. Do you think the air and soil surrounding the cactus is typically drier or wetter than the plant?b. How would soil moisture impact water transport in the plant?c. Why do you think cacti lack large green leaves found in plants that undergo more traditionalforms of photosynthesis?

Introduction Stomata are the tiny pores present underneath plant leaves. They regulate the exchange…

a. Do you think the air and soil surrounding the cactus is typically drier or wetter than the plant? b. How would soil moisture impact water transport in the plant? c. Why do you think cacti lack large green leaves found in plants that undergo more traditional forms of photosynthesis?

a. Do you think the air and soil surrounding the cactus is typically drier or wetter than the plant? b. How would soil moisture impact water transport in the plant? c. Why do you think cacti lack large green leaves found in plants that undergo more traditional forms of photosynthesis?

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter8: Photosynthesis

Section: Chapter Questions

Problem 15RQ: Plants containing only chlorophyll b are exposed to radiation with the following wavelengths: 10nm...

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Concept explainers

Photosynthesis

Plants have a capacity that we humans can only imagine— the ability to produce food from sunlight. Sure, we can prepare some dishes that we can savor on, but it become possible because of the plants (as they serve as a producers of all the raw materials required). Photosynthesis is the method of assembling carbohydrates with the aid of sunlight.

Question

8. Most plants open their stomata during the day when light is available for photosynthesis to
favor CO2 diffusion and then close them at night to conserve water. However, plants such as
the saguaro cactus (pictured) actually open their stomata at night to fix carbon and undergo
alternative photosynthetic reactions during the day instead of capturing sunlight for light-
dependent reactions. This is an adaptation to conserve water in desert climates. With this in
mind...
a. Do you think the air and soil surrounding the cactus is typically drier or wetter than the plant?
b. How would soil moisture impact water transport in the plant?
c. Why do you think cacti lack large green leaves found in plants that undergo more traditional
forms of photosynthesis?

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Which of the following is a correct step in the light-dependent reactions of the Z system? a. Light is absorbed at P700, and electrons flow through a pathway to NADP+, the final acceptor of the linear pathway. b. Electrons flow from photosystem II to water. c. NADP+ is oxidized to NADPH as it accepts electrons. d. Water is degraded to activate P680. e. Electrons pass through a thylakoid membrane to create energy to pump H+ through the cytochrome complex.
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Most of the carbon dioxide that plants use for photosynthesis comes from ________. a. glucose b. the atmosphere c. rainwater d. photolysis
What two main products result from photosynthesis? oxygen and carbon dioxide chlorophyll and oxygen sugars/carbohydrates and oxygen sugars/carbohyd rates and carbon dioxide
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How are carbon fixation and the Calvin cycle different in C4 plants and CAM plants?
Figure 5.7 On a hot, dry day, plants close their stomata to conserve Water. What impact will this have on photosynthesis?
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The oxygen released by photosynthesis comes from: a. CO2. b. H2O. c. light. d. NADPH. e. electrons.
How are the NADPH and GA3P molecules made during photosynthesis similar? They are both end products of photosynthesis They are both substrates for photosynthesis They are both produced from carbon dioxide They both store energy in chemical bonds.
Most of the carbon dioxide that plants use for photosynthesis comes from ________. a. glucose b. the atmosphere c. rainwater d. photolysis