Photosynthesis
Showing posts with label Photosynthesis. Show all posts
Showing posts with label Photosynthesis. Show all posts

Which process is most directly driven by light energy?

Which process is most directly driven by light energy?




A) creation of a pH gradient by pumping protons across the thylakoid membrane
B) carbon fixation in the stroma
C) reduction of NADP+ molecules
D) removal of electrons from chlorophyll molecules
E) ATP synthesis



Answer: D

In mechanism, photophosphorylation is most similar to

In mechanism, photophosphorylation is most similar to




A) substrate-level phosphorylation in glycolysis.
B) oxidative phosphorylation in cellular respiration.
C) the Calvin cycle.
D) carbon fixation.
E) reduction of NADP+



Answer: B

Which of the following statements is a correct distinction between autotrophs and heterotrophs?

Which of the following statements is a correct distinction between autotrophs and heterotrophs?




A) Only heterotrophs require chemical compounds from the environment.
B) Cellular respiration is unique to heterotrophs.
C) Only heterotrophs have mitochondria.
D) Autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic.
E) Only heterotrophs require oxygen



Answer: D

How is photosynthesis similar in C4 plants and CAM plants?

How is photosynthesis similar in C4 plants and CAM plants?




A) In both cases, only photosystem I is used.
B) Both types of plants make sugar without the Calvin cycle.
C) In both cases, rubisco is not used to fix carbon initially.
D) Both types of plants make most of their sugar in the dark.
E) In both cases, thylakoids are not involved in photosynthesis



Answer: C

If the power fails and the lights go dark, what will happen to CO2 levels?

If the power fails and the lights go dark, what will happen to CO2 levels?




A) CO2 will rise as a result of both animal and plant respiration.
B) CO2 will rise as a result of animal respiration only.
C) CO2 will remain balanced because plants will continue to fix CO2 in the dark.
D) CO2 will fall because plants will increase CO2 fixation.
E) CO2 will fall because plants will cease to respire in the dark


Answer: A

A spaceship is designed to support animal life for a multiyear voyage to the outer planets of the solar system. Plants will be grown to provide oxygen and to recycle carbon dioxide. Since the spaceship will be too far from the sun for photosynthesis, an artificial light source will be needed. What wavelengths of light should be used to maximize plant growth with a minimum of energy expenditure?

A spaceship is designed to support animal life for a multiyear voyage to the outer planets of the solar system. Plants will be grown to provide oxygen and to recycle carbon dioxide.


Since the spaceship will be too far from the sun for photosynthesis, an artificial light source will be needed. What wavelengths of light should be used to maximize plant growth with a minimum of energy expenditure?




A) full-spectrum white light
B) green light
C) a mixture of blue and red light
D) yellow light
E) UV light


Answer: C

If you ran the same experiment without passing light through a prism, what would you predict?

If you ran the same experiment without passing light through a prism, what would you predict?




A) There would be no difference in results.
B) The bacteria would be relatively evenly distributed along the algal filaments.
C) The number of bacteria present would decrease due to an increase in the carbon dioxide concentration.
D) The number of bacteria present would increase due to an increase in the carbon dioxide concentration.
E) The number of bacteria would decrease due to a decrease in the temperature of the water



Answer: B

Theodor W. Engelmann illuminated a filament of algae with light that passed through a prism, thus exposing different segments of algae to different wavelengths of light. He added aerobic bacteria and then noted in which areas the bacteria congregated. He noted that the largest groups were found in the areas illuminated by the red and blue light.

Theodor W. Engelmann illuminated a filament of algae with light that passed through a prism, thus exposing different segments of algae to different wavelengths of light. He added aerobic bacteria and then noted in which areas the bacteria congregated. He noted that the largest groups were found in the areas illuminated by the red and blue light.



Question : What did Engelmann conclude about the congregation of bacteria in the red and blue areas?

A) Bacteria released excess carbon dioxide in these areas.
B) Bacteria congregated in these areas due to an increase in the temperature of the red and blue light.
C) Bacteria congregated in these areas because these areas had the most oxygen being released.
D) Bacteria are attracted to red and blue light and thus these wavelengths are more reactive than other wavelengths.
E) Bacteria congregated in these areas due to an increase in the temperature caused by an increase in photosynthesis


Answer: C


An outcome of this experiment was to help determine

A) the relationship between heterotrophic and autotrophic organisms.
B) the relationship between wavelengths of light and the rate of aerobic respiration.
C) the relationship between wavelengths of light and the amount of heat released.
D) the relationship between wavelengths of light and the rate of photosynthesis.
E) the relationship between the concentration of carbon dioxide and the rate of photosynthesis


Answer: D

A gardener is concerned that her greenhouse is getting too hot from too much light, and seeks to shade her plants with colored translucent plastic sheets. What color should she use to reduce overall light energy, but still maximize plant growth?

A gardener is concerned that her greenhouse is getting too hot from too much light, and seeks to shade her plants with colored translucent plastic sheets. What color should she use to reduce overall light energy, but still maximize plant growth?





A) green
B) blue
C) yellow
D) orange
E) any color will work equally well



Answer: B

Which of the following statements is true concerning Figure 10.3?

Which of the following statements is true concerning Figure 10.3?




A) It represents cell processes involved in C4 photosynthesis.
B) It represents the type of cell structures found in CAM plants.
C) It represents an adaptation that maximizes photorespiration.
D) It represents a C3 photosynthetic system.
E) It represents a relationship between plant cells that photosynthesize and those that cannot



Answer: A

To identify the molecule that accepts CO2, Calvin and Benson manipulated the carbon-fixation cycle by either cutting off CO2 or cutting off light from cultures of photosynthetic algae. They then measured the concentrations of various metabolites immediately following the manipulation. How would these experiments help identify the CO2 acceptor? Study Figure 10.2 to help you in determining the correct answer.

To identify the molecule that accepts CO2, Calvin and Benson manipulated the carbon-fixation cycle by either cutting off CO2 or cutting off light from cultures of photosynthetic algae. They then measured the concentrations of various metabolites immediately following the manipulation. How would these experiments help identify the CO2 acceptor? Study Figure 10.2 to help you in determining the correct answer.




A) The CO2 acceptor concentration would decrease when either the CO2 or light are cut off.
B) The CO2 acceptor concentration would increase when either the CO2 or light are cut off.
C) The CO2 acceptor concentration would increase when the CO2 is cut off, but decrease when the light is cut off.
D) The CO2 acceptor concentration would decrease when the CO2 is cut off, but increase when the light is cut off.
E) The CO2 acceptor concentration would stay the same regardless of the CO2 or light




Answer: C

Figure 10.1 shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different?

Figure 10.1 shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they different?




A) Green and yellow wavelengths inhibit the absorption of red and blue wavelengths.
B) Bright sunlight destroys photosynthetic pigments.
C) Oxygen given off during photosynthesis interferes with the absorption of light.
D) Other pigments absorb light in addition to chlorophyll a.
E) Aerobic bacteria take up oxygen, which changes the measurement of the rate of photosynthesis.



Answer: D
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