Question:
The following are the usual diameter classes used in India.
The following are the usual diameter classes used in India.
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Standard $10 \text{ cm}$ diameter classes are also used to define tree developmental stages, such as saplings, poles, and mature timber trees, in silvicultural management.
Updated On: Jul 21, 2026
- 10cm, 20cm, 30cm
- 10cm, 15cm, 20cm
- 2cm, 5cm, 10cm
- 4cm, 8cm, 10cm
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
In forest inventories and management plans (Working Plans), grouping trees into standardized diameter classes is essential for organizing forest data and planning harvesting schedules.
Diameter classes help simplify the analysis of tree populations, growth rates, and volume yields.
Step 2: Detailed Explanation:
In India, forest working plans and inventories standardized by the Forest Survey of India (FSI) typically group tree diameters into classes at regular $10 \text{ cm}$ intervals.
These standard diameter classes are usually defined as:
- $10-20 \text{ cm}$
- $20-30 \text{ cm}$
- $30-40 \text{ cm}$
- $40-50 \text{ cm}$, and so on.
This $10 \text{ cm}$ interval system provides a practical balance for foresters: it is detailed enough to capture the structural distribution of the forest, yet simple enough to keep field measurements and data analysis manageable.
While smaller intervals (like $5 \text{ cm}$) may be used for intensive research, the $10 \text{ cm}$ class system is the standard for national forest inventories and working plans.
Step 3: Final Answer:
The standard diameter classes used in India are $10\text{cm}, 20\text{cm}, 30\text{cm}$, corresponding to option (A).
In forest inventories and management plans (Working Plans), grouping trees into standardized diameter classes is essential for organizing forest data and planning harvesting schedules.
Diameter classes help simplify the analysis of tree populations, growth rates, and volume yields.
Step 2: Detailed Explanation:
In India, forest working plans and inventories standardized by the Forest Survey of India (FSI) typically group tree diameters into classes at regular $10 \text{ cm}$ intervals.
These standard diameter classes are usually defined as:
- $10-20 \text{ cm}$
- $20-30 \text{ cm}$
- $30-40 \text{ cm}$
- $40-50 \text{ cm}$, and so on.
This $10 \text{ cm}$ interval system provides a practical balance for foresters: it is detailed enough to capture the structural distribution of the forest, yet simple enough to keep field measurements and data analysis manageable.
While smaller intervals (like $5 \text{ cm}$) may be used for intensive research, the $10 \text{ cm}$ class system is the standard for national forest inventories and working plans.
Step 3: Final Answer:
The standard diameter classes used in India are $10\text{cm}, 20\text{cm}, 30\text{cm}$, corresponding to option (A).
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