Exam 10: Photosynthesis: Energy From Sunlight

A researcher exposes a suspension of green algae to different light sources with different combinations of wavelengths.Compared with a suspension of algae that is receiving white light (source C), the algae suspension exposed to artificial light from source A remains healthy but produces less oxygen and has a slower growth rate.The algae suspension exposed to artificial light from source B ceases to produce oxygen, and its growth is halted.Which of the following statements about light sources is correct?

Refer to the absorption spectra and action spectrum for a green plant shown below. A bulb that emits a full spectrum of visible light is in use in the lamp used to illuminate an aquarium.Suppose that when this bulb burns out, the new bulb used to replace it has an emission spectrum that ranges from 500 to 600 nm.It can be expected that the aquatic plants present in the aquarium will show a(n) _______ in growth.

Which reaction taking place in a chloroplast directly depends on light?

Which statement about NADPH is false?

In the 1600s, a Belgian physician named Jan Baptista van Helmont ran an experiment on a young willow tree.He measured the tree's mass as well as the mass of the pot and soil he planted it in.van Helmont placed the tree in a well-lit spot and watered it periodically.After 5 years, he found that the mass of the plant had increased by 75 kilograms (165 pounds).The pot and soil together did not change significantly in mass.Some of the plant's increase in mass was due to water, but not all of it.Plant growth results from an increase in plant cells as well as extracellular materials that are made up of proteins, lipids, and carbohydrates.The source of carbon that went into constructing these molecules in van Helmont's willow tree was _______.

In photosynthetic noncyclic electron transport, water is used for the

If two plants have different-colored leaves,

The Calvin cycle is linked to glycolysis by which intermediate?

ATP affects the movement of malate from mesophyll cells to bundle sheath cells in which manner?

Refer to the table below, which summarizes similarities and differences between cyclic and noncyclic photophosphorylation. Which statement corrects an inaccuracy in this table?

A species of plant is found to use both cyclic and noncyclic photophosphorylation.Which outcome is most likely for this plant if cyclic photophosphorylation is completely inhibited?

Refer to the figure below. What process is depicted in this figure?

The activity of the Calvin cycle is linked to the light reactions of photosynthesis through the

Careful measurements of pH on each side of the thylakoid membrane have shown that the interior lumen is lower in pH than the exterior.This observation provides one piece of evidence that supports the _______ mechanism of ATP production in photophosphorylation.

Mustard plants were grown under 16 hours (hour 0 to 16) of light followed by 8 hours (hour 16 to 24) of dark for several weeks.Leaves were then excised at different times during a single 24-hour cycle and measured for mass before starch content was determined.The graph below summarizes the results of these analyses, showing starch content expressed as starch mass per leaf mass. These data provide evidence to directly support which statement about starch that is formed as the result of photosynthesis in plants?

Refer to the table below summarizing how several compounds can be effective as herbicides. Which compound or compounds applied to a green plant would not change the plant's ability to carry out chemiosmosis, and which compound or compounds would not change the plant's ability to produce NADPH? Assume that the plant uses both cyclic and noncyclic photophosphorylation systems.

Which sequence gives the correct flow of energy?

The steps of the Calvin cycle were determined through

Refer to the graph below showing results from experiments in which uptake of carbon dioxide by a leaf was measured as the leaf was irradiated with different quantities of light.The experiments were repeated at different levels of carbon dioxide in the air surrounding the leaf, to give the three curves. The rate of photosynthesis is increased at all three levels of carbon dioxide.Which causes are consistent with these data?

Evaluate energy flow through the ecosystem.What percentage of the sunlight that reaches Earth is converted into plant growth?