Question:
Given below are two statements
Statement I: In horizontal point sampling, a series of sampling points are selected randomly or systematically distributed over the entire area to be inventoried.
Statement II: Trees around this point are viewed through any angle gauge at breast height and all trees forming an angle lesser than the critical angle of instrument are counted.
In light of the above statements, choose the correct answer from the options given below
Given below are two statements
Statement I: In horizontal point sampling, a series of sampling points are selected randomly or systematically distributed over the entire area to be inventoried.
Statement II: Trees around this point are viewed through any angle gauge at breast height and all trees forming an angle lesser than the critical angle of instrument are counted.
In light of the above statements, choose the correct answer from the options given below
Statement I: In horizontal point sampling, a series of sampling points are selected randomly or systematically distributed over the entire area to be inventoried.
Statement II: Trees around this point are viewed through any angle gauge at breast height and all trees forming an angle lesser than the critical angle of instrument are counted.
In light of the above statements, choose the correct answer from the options given below
Show Hint
Point Sampling Logic: If the tree looks "fat" compared to your gauge, count it. If it looks "thin," it's out. This method is brilliant because it automatically weights trees by their basal area without measuring diameters!
Updated On: Aug 7, 2026
- Both Statement I and Statement II are true
- Both Statement I and Statement II are false
- Statement I is true but Statement II is false
- Statement I is false but Statement II is true
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Question:
The question refers to "Horizontal Point Sampling" (HPS), also known as Variable Radius Plot sampling or Bitterlich's method, which is used to estimate the basal area of a forest.
Step 2: Detailed Explanation:
• Statement I analysis: Point sampling requires a set of sampling points distributed across the forest area. These points can be laid out using simple random sampling or systematic grids. This is the standard procedure for forest inventory. Thus, Statement I is true.
• Statement II analysis: In HPS, an angle gauge (like a wedge prism or Relaskop) is used. The forester stands at the sampling point and views trees through the instrument at breast height.
• Selection Rule: Trees that appear wider than the fixed angle (the critical angle) of the instrument are counted as "In" trees. Trees that appear exactly as wide as the angle are "Borderline," and those appearing smaller/narrower than the angle are "Out" and are not counted.
• Error in Statement II: It says "trees forming an angle lesser than the critical angle... are counted." This is the exact opposite of the correct rule. Only trees subtending an angle greater than or equal to the critical angle are counted. Therefore, Statement II is false.
Step 3: Final Answer:
Statement I is correct, but Statement II is incorrect regarding the counting rule for point sampling.
The question refers to "Horizontal Point Sampling" (HPS), also known as Variable Radius Plot sampling or Bitterlich's method, which is used to estimate the basal area of a forest.
Step 2: Detailed Explanation:
• Statement I analysis: Point sampling requires a set of sampling points distributed across the forest area. These points can be laid out using simple random sampling or systematic grids. This is the standard procedure for forest inventory. Thus, Statement I is true.
• Statement II analysis: In HPS, an angle gauge (like a wedge prism or Relaskop) is used. The forester stands at the sampling point and views trees through the instrument at breast height.
• Selection Rule: Trees that appear wider than the fixed angle (the critical angle) of the instrument are counted as "In" trees. Trees that appear exactly as wide as the angle are "Borderline," and those appearing smaller/narrower than the angle are "Out" and are not counted.
• Error in Statement II: It says "trees forming an angle lesser than the critical angle... are counted." This is the exact opposite of the correct rule. Only trees subtending an angle greater than or equal to the critical angle are counted. Therefore, Statement II is false.
Step 3: Final Answer:
Statement I is correct, but Statement II is incorrect regarding the counting rule for point sampling.
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