Healthy vegetation reflects energy in what parts of the electromagnetic spectrum?Green and RedBlue and GreenGreen and Near-InfraredBlue and Red

Healthy vegetation reflects energy in what parts of the electromagnetic spectrum?

1. Green and Red
2. Blue and Green
3. Green and Near-Infrared
4. Blue and Red

Step-by-step analysis:

1. Understanding the electromagnetic spectrum: The electromagnetic spectrum includes various types of electromagnetic radiation, ranging from gamma rays to radio waves. Visible light is a small part of this spectrum, and it includes colors like blue, green, and red. Near-infrared (NIR) is just beyond the visible spectrum.

2. Healthy vegetation and reflection: Healthy vegetation has a unique spectral signature. It absorbs most of the visible light, especially in the blue and red wavelengths, for photosynthesis. However, it reflects a significant amount of green light, which is why plants appear green to our eyes. Additionally, healthy vegetation reflects a large portion of near-infrared light, which is not visible to the human eye but can be detected by special sensors.

3. Evaluating the options:

   • Green and Red: This option is incorrect because healthy vegetation absorbs red light rather than reflecting it.
   • Blue and Green: This option is incorrect because healthy vegetation absorbs blue light rather than reflecting it.
   • Green and Near-Infrared: This option is correct because healthy vegetation reflects green light and a significant amount of near-infrared light.
   • Blue and Red: This option is incorrect because healthy vegetation absorbs both blue and red light.

Conclusion: The correct answer is Green and Near-Infrared.