multiple-choice question chlorophyll a reflects ______ light (select all that apply) orange yellow blue violet green

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# Brief Explanations:
To determine which light chlorophyll a reflects, we analyze the absorption spectrum. Chlorophyll a absorbs light strongly in the violet - blue (around 400 - 500 nm) and red (around 600 - 700 nm) regions. The wavelengths it reflects are those with low absorption. The green region (around 500 - 600 nm) has relatively low absorption, so chlorophyll a reflects green light. Also, looking at the spectrum, the yellow - green - green range (including green) is reflected. Among the options, green is the main color reflected, and also, the absorption in the yellow - green area is relatively low, so yellow and green are reflected? Wait, no, the key is that chlorophyll a appears green because it reflects green light. Wait, let's re - examine: the absorption peaks are in blue - violet and red. So the wavelengths between, like green (and maybe yellow - green) are reflected. But the options are green, violet, blue, yellow, orange. Violet and blue are absorbed (high absorption), orange and red? Wait, the red region: the absorption at 600 - 700, the graph shows that at 600 - 700, the absorption has a dip? Wait, no, the y - axis is relative absorption. At 400 - 500 (violet - blue), absorption is high. At 500 - 600 (green - yellow), absorption is low. At 600 - 700 (orange - red), there is a peak? Wait, no, the graph: the top line (leaf pigments and light) and chlorophyll a. Wait, the chlorophyll a curve: at 400 - 500, it's high, then drops at 500 - 600 (low absorption), then rises again at 600 - 700? Wait, no, the x - axis is wavelength (nm) from 400 to 700, increasing downwards. The y - axis is relative absorption. So at 400 (top), absorption is high, then at 500, it drops, then at 600, it drops more? Wait, no, the curve for chlorophyll a: starts high at 400, decreases until around 500, then has a small increase, then decreases again? Wait, maybe I misread. But the key concept is that chlorophyll a reflects green light (so green is reflected). Also, the yellow - green area: since absorption is low there, yellow and green are reflected? Wait, the options are green, violet, blue, yellow, orange. Violet and blue are absorbed (high absorption), so not reflected. Orange: the red - orange region, is absorption high? Wait, the graph at 600 - 700: the chlorophyll a curve, at 600 - 700, the absorption is lower than at 400 - 500, but higher than at 500 - 600? Wait, maybe the correct approach is: chlorophyll a reflects green and yellow - green light. So among the options, green and yellow are reflected? But the question says "select all that apply". Wait, the options are checkboxes: green, violet, blue, yellow, orange. So:

- Violet: absorbed (high absorption) → not reflected.
- Blue: absorbed (high absorption) → not reflected.
- Yellow: the wavelength around yellow (550 - 600 nm) has low absorption → reflected.
- Green: the wavelength around green (500 - 550 nm) has low absorption → reflected.
- Orange: the wavelength around orange (600 - 650 nm) – let's see the chlorophyll a curve. At 600 - 700, the absorption is higher than at 500 - 600 but lower than at 400 - 500? Wait, maybe orange is also reflected? No, the main reflection is green, and also yellow. Wait, the standard knowledge: chlorophyll a reflects green and yellow - green light. So the correct options are green and yellow? Wait, but the graph: at 500 - 600 (yellow - green - green), absorption is low. So yellow (around 550 - 600) and green (around 500 - 550) are reflected. Also, maybe orange? No, orange is closer to red, which is absorbed more. Wait, maybe the answer is green, yellow, and maybe orange? No, let's go back to the basic: chlorophyll a appears green, so it reflects green light. Also, the absorption in the yellow - green area is low, so yellow is also reflected. So among the options, green and yellow are reflected. But let's check the options again. The options are green, violet, blue, yellow, orange. So:

- Green: reflected (correct).
- Yellow: the wavelength of yellow is around 570 - 590 nm, which is in the low - absorption region → reflected (correct).
- Orange: wavelength around 590 - 620 nm, absorption here: the chlorophyll a curve at 600 - 700, is the absorption high? The graph shows that at 600 - 700, the absorption has a peak? Wait, no, the y - axis is relative absorption. At 400 - 500: high. At 500 - 600: low. At 600 - 700: there is a small peak? Wait, maybe orange is also reflected? But the standard answer is that chlorophyll a reflects green and yellow - green, so green and yellow. But maybe the options here: green is definitely reflected, yellow is also reflected. Wait, but the question is "select all that apply". So the correct options are green, yellow, and maybe orange? No, let's think again. The absorption spectrum of chlorophyll a: strong absorption in blue (430 nm) and red (662 nm). So the wavelengths between, like green (500 - 600 nm) are reflected. So green is reflected. Also, the area around yellow (550 - 600 nm) is also reflected, so yellow is reflected. So the correct options are green and yellow. But maybe the answer is green, yellow, and orange? No, I think the main ones are green and yellow. Wait, the graph: at 500 - 600 (yellow - green), absorption is low, so yellow and green are reflected. At 600 - 700 (orange - red), absorption is higher than at 500 - 600 but lower than at 400 - 500, so maybe orange is also reflected? But the standard answer for chlorophyll a's reflection is green and yellow - green. So among the options, green and yellow are correct. Wait, but the user's question is a multiple - choice, so we need to select the correct options.
# Answer:
green, yellow

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