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The rate of photosynthesis of a freshwater plant is measured using five spectral colours. Which sequence of colours would give an increasing photosynthetic response?


Smallest → Largest response

  • a)
    Blue > Green > Yellow > Orange > Red

  • b)
    Green < Yellow < Orange < Red < Blue

  • c)
    Red > Orange > Yellow > Green > Blue

  • d)
    Yellow > Green > Orange > Blue > Red

Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
The rate of photosynthesis of a freshwater plant is measured using fiv...
The correct answer is b). The photosynthetic response of a plant is highest for blue and red light and lowest for green light. This is because the chlorophyll pigments in plants absorb blue and red light most efficiently, and green light least efficiently.

Here is a table showing the photosynthetic response of a plant to different wavelengths of light:

Wavelength (nm)
      Photosynthetic response
400-450
                       Highest
600-700
                       Highest
500-550
                       Lowest
So, the correct sequence of colours for increasing photosynthetic response would be:

Green
Yellow
Orange
Red
Blue
In other words, the plant would photosynthesize most efficiently in blue light, followed by red light, then orange, yellow, and green.

Free Test
Community Answer
The rate of photosynthesis of a freshwater plant is measured using fiv...
To largest photosynthetic response:
1. Red
2. Orange
3. Yellow
4. Green
5. Blue
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