After Reading the Paragraph Below, Answer the Questions That Follow

question 21

Multiple Choice

After reading the paragraph below, answer the questions that follow.
You're conducting an experiment to determine the effect of different wavelengths of light on the absorption of carbon dioxide as an indicator of the rate of photosynthesis in aquatic ecosystems. If the rate of photosynthesis increases, the amount of carbon dioxide in the environment will decrease, and vice versa.
Small aquatic plants are placed into three containers of water mixed with carbon dioxide. Container A is placed under normal sunlight, B under green light, and C under red light. The containers are observed for a 24-hour period.
-Carbon dioxide absorption is an appropriate indicator of photosynthesis because

• A)CO₂ is needed to produce sugars in the Calvin cycle.
• B)CO₂ is needed to complete the light reactions.
• C)plants produce oxygen gas by splitting CO₂.
• D)the energy in CO₂ is used to produce ATP and NADPH.

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Definitions:

Diverse Ecosystem

A biological community characterized by a variety of species, genetic variability, and ecological roles within its environment.

Botanicals

Plant-derived substances used in health foods, supplements, and cosmetics for their potential benefits or therapeutic properties.

Rotenone

A chemical compound derived from certain plants used as an insecticide and piscicide due to its toxicity to mitochondria.

Pyrethrum

A natural insecticide made from the dried flower heads of certain chrysanthemum species, used to control pests.