Which of the following statements is correct? 1.. Soil containg sand and Crop rotation protects soil fertility. 2. Clay soil can't hold water for a long time. 3.Upper layers of soil are made of rocks.

Which of the following statement is correct? Correct the wrong one. Crop rotation protects soil fertility.

Which of the following statement is correct? Correct the wrong one. Soil form from sand.

Which of the following statement is correct? Correct the wrong one. Upper layers of soil are made of rocks.

Which of the following statement is correct? Correct the wrong one. Clay soil can't hold water for a long time.

Read the following statements and select the correct option: (a) Major reservoirs of phosphorus are phosphate rocks and fossil bone deposits laid down in the past geological ages. (b) During weathering of rocks, minute amounts of these phosphates dissolve in soil solution and are absorbed by the roots of the plants.

Given that T stands for time period nd 1 stands for the length of simple pendulum. If g is the acceleration due to gravity, then which of the following statements about the relation T^(2)=(l)/(g) is correct ? (I) It is correct both dimensionally as well unmerically (II) It is neither dimensionally correct nor numerically (III) It is dimensionally correct but not numerically (IV) It is numerically correct but not dimensionally

Statement - 1: Root cap protects the root apical meristem from the effect of the soil particles Statement - 2 : Hard soil particles damage the outer cells of root cap which are peeled off and replaced by new cells produced by root meristem

Read the following sentences. Digging contour field bunding horizontally Glircidia plants store nitrogen in soil Crop yield is measured in T.M.C. Supply of water by sprinklers is called micro irrigation What are the correct sentences mention above ?

Read the following passage. Correct it into a tabular form. Soil is make up of distinct horizontal layers called Horizons. They are divided into O, A, E, B, c and R horizons. O-horizon made of mostly of humus, Plant roots can grow in A-horizon, Water drips through E-horizon. B-horizon is also called subsoil. C-horizon consists of slightly broken up bedrock where as R-horizon have unweathered Rock.

Following passage describes charcterstics of colloids. Answer the questions at the end of it. Lyophilic colloidal sols are much more stable than lyophobic colloidal sols. This is due to the extensive solvation of lyophilic colloidal sols, which forms a protective layer outside it and thus prevents it from forming associated colloids. Lyophillic colloidal sols also protect lyophobic colloidal sols from precipition by the action of electrolytes. This is due to formation of a protective layer by lyophilic sols outside lyophobic sols. Lyophilic colloidal sols are called protective sols. Gelatin (lyophilic) protects gold sol (lyophobic) from coagulaion on the addition of sodium chloride solution. Protective powers of different colloidal sols are measured in terms of 'gold number' (Zigmody). It is defined as the amount of protective sol in milligrams that prevents the coagulation of 10 mL of a given gold sol on adding 1 mL of 10 percent sodium chloride. Thus smaller the gold number of a lyophillic sol, the greater is the protective power. [AgI]I^(-) collodial sol can be coagulated by the addition of a suitable cation. 1 mol of [Agl]I^(-) requires mol of AgNO_3, Pb(NO_3)_2 and Fe(NO_3)_3 as