Question

Given below are two statements
Statement I: Chisel type tillage tools breakup the soil without inverting it
Statement II: Disc blades sharpened from the concave side penetrate more readily than disk blades sharpened from convex side
In light of the above statements, choose the most appropriate answer from the options given below

• A. Both Statement I and Statement II are correct
• B. Both Statement I and Statement II are incorrect
• C. Statement I is correct but Statement II is incorrect
• D. Statement I is incorrect but Statement II is correct

Hint:

Chisel plows are the primary tool used in conservation tillage.
They are designed to loosen and aerate the soil while leaving crop residue on the surface to prevent soil erosion.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
This question evaluates the physical actions and cutting mechanics of different tillage implements.
Tillage tools are designed to manipulate the soil to prepare a seedbed, control weeds, or manage crop residue.
Detailed Explanation:
Let us analyze Statement I:
Chisel plows are primary tillage tools equipped with narrow, curved shanks.
As they are pulled through the soil, they shatter and loosen the hardpan layers through deep fracturing.
Unlike traditional moldboard plows, chisel plows do not invert or flip the soil.
This leaves crop residue on the surface, which helps prevent wind and water erosion.
Thus, Statement I is correct.
Let us analyze Statement II:
A disc blade is a curved, circular steel plate.
When a disc blade is sharpened on its concave side, it creates a sharp cutting edge with an acute angle at the soil entry point.
This sharp profile reduces the upward soil resistance acting on the blade, allowing it to penetrate the soil more easily.
Sharpening on the convex side, by contrast, creates a blunter entry profile that resists soil penetration.
Thus, Statement II is correct.

Step 2: Final Answer:
Both Statement I and Statement II are correct.