Question

Match List I with List II
List I (Instruments):
A. Wheeler's Pentaprism
B. Wedge Prism
C. Conimeter
D. Canopy analyser
List II (Measured Parameters):
I. Leaf Area Index
II. Vertical point sampling
III. Horizontal point sampling
IV. Diameter of the standing tree
V. Form factor

• A. A‐V, B‐III, C‐II, D‐IV
• B. A‐IV, B‐III, C‐II, D‐I
• C. A‐IV, B‐III, C‐I, D‐V
• D. A‐IV, B‐III, C‐I, D‐II

Hint:

Wedge Prism = Basal Area (Horizontal Point Sampling). This is the most common instrument pairing in all forestry exams. LAI = Canopy Analyser.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
The question requires matching specialized instruments used in forest mensuration and ecology with the specific parameters or techniques they are used for.

Step 2: Detailed Explanation:

• Wheeler's Pentaprism (A): As established in Question 41, this optical device is specifically used to measure the diameter of a standing tree (IV) at unreachable heights.

• Wedge Prism (B): This simple glass prism is the standard tool for Horizontal Point Sampling (III) (Bitterlich's method) to estimate basal area per hectare.

• Conimeter (C): This instrument is often utilized for Vertical Point Sampling (II) or measuring crown/vertical angles in certain inventory designs. (Note: While sometimes associated with crown cover, in this technical pairing, II is the best fit).

• Canopy Analyser (D): Modern digital canopy analysers (like the hemispherical lens systems) are primarily used to calculate the Leaf Area Index (LAI) (I) by measuring light penetration through the canopy.

Step 3: Final Answer:
The correct matching is: A-IV, B-III, C-II, D-I. This matches option (B).