Question

1. construct an argument that explains why leaves change color in the fall and how the rate of photosynthesis is affected during this time. use evidence from the models and phenomena to support your response.

Explanation:

Leaves change color in fall due to shorter days and cooler temperatures. Chlorophyll production slows and breaks down, revealing other pigments like carotenoids (yellow/orange) and anthocyanins (red). Photosynthesis rate decreases as chlorophyll (key for capturing light energy) is reduced. With less chlorophyll, less light is absorbed for the light - dependent reactions of photosynthesis. Also, the enzymes involved in the Calvin cycle (light - independent reactions) may have reduced activity due to lower temperatures.

Answer:

Leaves change color in fall because chlorophyll breaks down (due to environmental cues like shorter days and cooler temps), revealing other pigments. Photosynthesis rate decreases as chlorophyll (essential for light absorption in photosynthesis) is reduced.