5A - Absorption and Action Spectra Flashcards
What are photosystems?
Photosystems are protein complexes containing photosynthetic pigments embedded in the thylakoid membranes of chloroplasts.
How do different photosynthetic pigments absorb light?
Different pigments absorb light of different wavelengths due to their specific molecular structures.
What wavelengths of light do chlorophylls primarily absorb?
Chlorophylls absorb wavelengths in the blue-violet and red regions of the light spectrum.
Why do plants appear green?
Chlorophylls reflect green light, making plants appear green in color.
What wavelengths of light do carotenoids mainly absorb?
Carotenoids absorb wavelengths in the blue-violet region of the spectrum.
Why do carotenoids contribute to autumn leaf colors?
Carotenoids remain in leaves after the breakdown of chlorophyll, giving leaves their yellow, orange, and red autumn colors.
What is an absorption spectrum?
An absorption spectrum represents the amount of light absorbed by a pigment at different wavelengths.
Why do different pigments have different absorption spectra?
Different pigments have distinct molecular structures, resulting in different absorption spectra.
What is an action spectrum?
An action spectrum shows the rate of photosynthesis at different wavelengths of light.
How are action spectra related to absorption spectra?
Action spectra are closely correlated to the absorption spectra of the photosynthetic pigments.
How does the presence of different pigments benefit plants in photosynthesis?
Having multiple pigments with different absorption spectra allows plants to capture a wider range of light wavelengths, extending their action spectra and maximizing photosynthetic rates.
How does the availability of light wavelengths affect a plant’s rate of photosynthesis?
A plant’s rate of photosynthesis varies depending on the wavelengths of light available.
Why do plants possess a variety of pigments with different absorption spectra?
The presence of different pigments enables plants to adapt and perform photosynthesis under a wider range of light wavelengths.
What is the significance of action spectra in photosynthesis?
Action spectra provide valuable information about the wavelengths of light that are most effective for driving photosynthesis in plants.
How do the absorption spectra of pigments contribute to action spectra in plants?
The absorption spectra of pigments determine the wavelengths of light that can be utilized for photosynthesis, thereby influencing the shape of the action spectrum.
