Sia
Question
Biology
Posted 9 months ago
Using the photosynthetic absorption spectrum below, explain briefly which
colours might elicit a positive phototropic response and why.
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Answer from Sia
Posted 9 months ago
Answer
The colors that might elicit a positive phototropic response in plants are primarily blue and red.
Solution
a
Blue light: Blue light (around 450-495 nm) is highly absorbed by chlorophyll a and b, which are the main pigments involved in photosynthesis. This absorption leads to a strong positive phototropic response as plants grow towards the light source to maximize photosynthesis
b
Red light: Red light (around 620-750 nm) is also absorbed by chlorophyll, though to a slightly lesser extent than blue light. It still plays a significant role in photosynthesis and can elicit a positive phototropic response
Key Concept
Photosynthetic absorption spectrum
Explanation
The photosynthetic absorption spectrum shows which wavelengths of light are absorbed by photosynthetic pigments. Blue and red light are absorbed most efficiently, leading to a positive phototropic response as plants grow towards these light sources to optimize photosynthesis.
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