Question:
Which electromagnetic wave band is most sensitive to plant chlorophyll content? [Question ID = 1496][Question Description = 156_6_PHSC_AUG22_Q56]
Which electromagnetic wave band is most sensitive to plant chlorophyll content? [Question ID = 1496][Question Description = 156_6_PHSC_AUG22_Q56]
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Remember the spectral curve of vegetation: Absorption in Blue and Red, Reflection peak in Green, and a massive "Red Edge" jump in reflectance in the NIR region.
Updated On: Aug 7, 2026
- Green
- Red
- Near infrared
- Thermal infrared
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Vegetation has a unique spectral signature. Different physiological components absorb or reflect specific wavelengths.
Step 2: Detailed Explanation:
Chlorophyll is the primary pigment involved in photosynthesis. It strongly absorbs energy in the blue and red (Statement 2) portions of the visible spectrum to drive photochemical reactions.
It reflects green light, which is why healthy plants appear green to our eyes.
In remote sensing, the red band (around 0.6 to 0.7 micrometers) is highly sensitive to the concentration of chlorophyll. As a plant becomes stressed or its chlorophyll content decreases, the absorption in the red band decreases, and reflectance increases.
The Near-infrared (Statement 3) band is sensitive to the internal leaf structure (mesophyll cells) but not directly to chlorophyll pigments.
Thermal infrared (Statement 4) is sensitive to plant temperature and moisture stress.
Indices like NDVI (Normalized Difference Vegetation Index) use the contrast between the high absorption in the Red band and high reflectance in the NIR band to assess vegetation health.
Step 3: Final Answer:
The Red band is most sensitive to chlorophyll content because that is where maximum absorption occurs.
Vegetation has a unique spectral signature. Different physiological components absorb or reflect specific wavelengths.
Step 2: Detailed Explanation:
Chlorophyll is the primary pigment involved in photosynthesis. It strongly absorbs energy in the blue and red (Statement 2) portions of the visible spectrum to drive photochemical reactions.
It reflects green light, which is why healthy plants appear green to our eyes.
In remote sensing, the red band (around 0.6 to 0.7 micrometers) is highly sensitive to the concentration of chlorophyll. As a plant becomes stressed or its chlorophyll content decreases, the absorption in the red band decreases, and reflectance increases.
The Near-infrared (Statement 3) band is sensitive to the internal leaf structure (mesophyll cells) but not directly to chlorophyll pigments.
Thermal infrared (Statement 4) is sensitive to plant temperature and moisture stress.
Indices like NDVI (Normalized Difference Vegetation Index) use the contrast between the high absorption in the Red band and high reflectance in the NIR band to assess vegetation health.
Step 3: Final Answer:
The Red band is most sensitive to chlorophyll content because that is where maximum absorption occurs.
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