Question

unit 3 test.m
based on what you know about energy production, now predict which of the two processes produces more sugar in a day.
○ photosynthesis, solely because it produces a greater number of energy molecules per round.
○ respiration, solely because it happens all day long.
○ respiration, because it happens all day long and produces a greater number of energy molecules per round.

Explanation:

To determine the correct answer, we analyze the processes of photosynthesis and respiration:

1. Photosynthesis produces sugar (glucose) using light energy, carbon dioxide, and water. However, it primarily occurs during daylight hours.
2. Respiration (cellular respiration) breaks down sugar to release energy (ATP) and occurs continuously (day and night) in living cells. Additionally, each round of respiration (e.g., aerobic respiration) yields a large number of ATP molecules (energy molecules) compared to the energy storage in glucose produced by one round of photosynthesis.
3. Analyzing the options:

• The first option is incorrect because photosynthesis does not produce "a greater number of energy molecules per round" (it stores energy in glucose, while respiration releases more energy per glucose molecule broken down). Also, photosynthesis only occurs during the day, not all day long.
• The second option is incorrect as it claims respiration "solely because it happens all day long"—but the rate and energy yield per round also matter.
• The third option is correct: Respiration happens all day (and night) and produces a greater number of energy molecules (ATP) per round (or per glucose molecule) compared to the energy stored in glucose from one round of photosynthesis.

Answer:

Respiration, because it happens all day long and produces a greater number of energy molecules per round.