Question Bank • QB_FM_151 MCQ • 1 Mark

Section 2: Farm Machinery

Farm Machinery

Subtopic: Equipment for precision agriculture

Question Statement:

In optical crop canopy sensing, the Normalized Difference Vegetation Index (NDVI) is computed from reflectance in Red ($R$) and Near-Infrared ($NIR$) wavebands as:

Options:

  • (A) $\text{NDVI} = \frac{NIR - R}{NIR + R}$
  • (B) $\text{NDVI} = \frac{NIR + R}{NIR - R}$
  • (C) $\text{NDVI} = \frac{R - NIR}{R + NIR}$
  • (D) $\text{NDVI} = \frac{NIR \times R}{NIR + R}$

Answer Key:

A

Step-by-Step Solution & Explanation

By standard definition: $\text{NDVI} = \frac{NIR - Red}{NIR + Red}$ Healthy green vegetation absorbs red light for photosynthesis and strongly reflects near-infrared light from the leaf mesophyll.
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