• Tillage refers to the physical mechanical manipulation of the soil with agricultural implements to create conditions favourable for crop growth.
• Tilth is the physical condition resulting from tillage operations that describes soil crumb structure, friability, porosity, aeration, and moisture permeability relative to its fitness as a seedbed.
• Good tilth is characterized by an optimal distribution of porous soil granules and crumbs (1-5 mm) that promote rapid root penetration without soil crusting.
• Conventional and conservation tillage refer to systems or practices of tillage, whereas the resulting physical state of the soil is called tilth.

This question was dropped/deleted by RPSC in the final answer key due to ambiguous phrasing and overlapping options between depletion percentage and remaining moisture percentage.

• 15 to 25% depletion of available soil moisture: Too wet for most soil types, causing compaction or clodding.
• 25 to 50% depletion of available soil moisture: Represents 50-75% remaining available water, which is the friable range for ploughing.
• Contains 50 to 75% of available soil moisture: Represents the same physical soil moisture range as option (B), creating conflicting correct answers.
• to 10% depletion of available soil moisture: Soil remains excessively wet.

Continuous zero-tillage leaves vegetative propagules (rhizomes, stolons, tubers) undisturbed near the surface, leading to a floristic shift toward perennial weeds.

• Annual weeds: Frequent tillage tends to bring dormant annual weed seeds to the surface, which zero-tillage actually reduces over time.
• Biennial weeds: Less common in intensively cropped agricultural fields.
• Perennial weeds: Lack of soil inversion allows perennial rootstocks and underground vegetative organs (e.g. Cynodon dactylon, Cyperus rotundus) to establish vigorously.
• Parasitic weeds: Regulated by specific host crops, not tillage regime.