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JIPMER2007BotanyPhotosynthesis in Higher Plants

Photosynthetic Active Radiation (PAR) has the following range of wavelengths

Options

  1. A400-700 ~nm
  2. B450-950 ~nm
  3. C340 - 450 nm
  4. D500 - 600 nm

Correct answer

A. 400-700 ~nm

Step-by-step solution

The cosmic rays, X-rays, UV-rays, the visible spectrum, infra red rays, radio waves, coming from sun are constituted electromagnetic spectrum. The waves of each of these types have a characteristic range of wavelengths. The visible spectrum, which is also known as Photosynthetic Active Radiation (PAR), has a range of wavelength of 380 nm to 760 nm . This part of electromagnetic spectrum is responsible for photosynthesis.

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