Question

A plank is used to break the crumbs into
A. Stones
B. Fine soil
C. Gritty soil
D. Mud

Answer 1

A plank is a wooden material which is rectangular with handle that are used in agriculture to break the crumbs, and it is part of plowing too, to bring inner soil to outer and make it porous, so that soil is aerated.

Complete answer:
-Crumbs are the large pieces of soil which are found on the agriculture land where that is the aggregation of soil particles which is present as lumps.
-Generally the soil of the agricultural land is a porous system, where soil is present in three forms that are solid, liquid and gaseous phases.
-In agriculture soil, solid phase constitutes organic matter, while moist soil forms the liquid part, and the gaseous part is the air that is present in the soil.
-At the same time porous soil consist of three types of pores that are small, medium and large, where small pores are not that much friendly where water conduction is not proper, and large pores is also not friendly as water can easily run off in large pores, and the water holding pores in the soil wee medium pores, and this crumbs are found in the porous soil.
-The process of breaking the crumbs in the soil with the help of wooden planks or any other instrument is called Pulverization.
-The reason for Pulverization is to make fine soil so that roots of the growing plant can easily adapt and grow in the soil, and breaking the crumbs makes the soil porous which makes the crop more fertile.
So the correct option is B.

Note:
To explain in simple manner crumbs are the aggregated soil granules that present in the agriculture ground, and breaking them are important as it makes soil porous and areated that helps soil to hold water molecules more and important for crops growth.