Question

A plantation containing 15,000 trees is established with a spacing of 2 m × 2 m. The number of trees that could be retained after two mechanical thinnings in that plantation is

• A. 5000
• B. 4750
• C. 3750
• D. 1250

Hint:

Mechanical thinning:
- Removes trees in a fixed pattern.
- Typically removes 50% of trees each time.
- After two thinnings, 25% of original trees remain.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
This question tests knowledge of thinning operations and their impact on tree population.

Step 2: Key Formula or Approach:
Mechanical thinning removes trees in rows or fixed patterns.
Each mechanical thinning typically removes about 50% of the trees.
After two mechanical thinnings, the number of trees retained would be 25% of the original.

Step 3: Detailed Explanation:
Initial number of trees = 15,000.
After first thinning (50% removed): remaining = 15,000 × 0.5 = 7,500.
After second thinning (50% removed): remaining = 7,500 × 0.5 = 3,750.
Thus, the number of trees retained is 3,750.

Step 4: Final Answer:
Thus, the number of trees retained after two mechanical thinnings is 3,750, which corresponds to option (C).
[0.5cm]