MCQs of Agriculture – Soil Science

Father of agricultural chemistry is

Mineral soil contain organic carbon

Organic soil are called

Histols are found in

Main product of photosynthesis is

Elements essentially required for growth of all plants species are

Mechanisms of material uptake by plants is by

Problem of erosion in Thal and Cholistan is due to

Planets in our system are

Age of Earth is

hydrosphere refers to

Lithosphere refers to

The inner shell of earth consists of

The soil of Sindh (Pakistan) have pH

Fine-graned rocks formed on earth crust are called

Rhyolite in nature is

Which rock contain potash feldspar?

Rocks which are formed by disintegration of pre-existing rocks by weathering are

The site of grains present in sands structuring range

Silt stones consists of grains whose size range from

Rocks formed from compacted clay or mud are called

Metamorphic rocks are formed from

Which rock is harder

Schist is example of

Most abundant mineral in the earth crust is

Which mineral contain phosphorus

Which compound is mostly used in Pakistan for the reclamation of saline-sodic & sodic soils

How many different minerals deposits are found in Pakistan?

Geochemical weathering processes occurs

Plutonic rocks are also called

Color off basic matic rock is

Felsic rocks consists of

Igneous rock whose crystal is 1 cm called

Structure and size of aphantic rock is

Thick concordant bodies which force the overlying sediments to form dome-shaped hills are called

Thickness of Dikes ranges from

Places where volcanoes occur are

Rocks having coarse bubble holes are called

Large pieces of erupted magma are called

Tuff is

Weathering of gabbros gives

Attraction between similar particles is called

Which one of the following is physical property of soil

Process of mixing soil by fauna and flora is called

Indus rive plain of Pakistan have developed from

Most widely spread mineral in the world is

Which soil bolds more water?

Soil particles having diameter greater than 2 mm are called

Which soil is suitable for nce

Which instrument is used for determining soil texture

The aggregation of individual particles is called

Physical condition of soil for plant growth is called

Color of fertile soil is

Pneumatic potential is due to

Weathering is

Product of microorganism that appears to chelate calcium is called

Who gave the equation for study of soil property?

Which is passive factor of weathering?

The nutrient particularly influencing root growth is

Mollic refers to

Who characterized soil formation as set of “4” process

Kaolinite can be identified by

Slipperiness is due to

Shrinking and swelling is property of

Which element can be fixed by smecitite

Size of clay particle is

Permanent change in soil is due to

Soil water can be determined by

Gravimetric water is present in

Which one of the following are macro nutrients

Vertical movement of water was studied by

An ion or molecule in the coordination sphere central ion is called

When two or more functional groups of single ligand are coordinated to metal cation the complex is termed as

Ligands that occur in Pakistan soils are

pH of Pakistani soils is

pH in coniferous forest is

Identify the fertilizer (s) containing potassium

A soil is categorized as saline when EC of saturation extract is

A soil is classified as sodic soil when

How much percentage of soils of Pakistan are deficient in P

The available from of nitrogen for plant is

Microorganisms have C/N ratio of

The molar mass of NaCl is

The zorawar is brand name of

The available form of calcium to plant is

The factor used for conversion of P to P2O3 is

International atomic weight of potassium is

Acid soil contain pH

The chemical formula of urea fertilizer is

DAP fertilizer available in Pakistan contains

Buffer solution is a solution which resist change in

The complex fertilizer Nitrophos available in the market contains

The term applied to a material which tends to absorb moisture from the atmosphere is called

Radiation can be detected by the blankening of photographic film or by using

The kaolininte is a layer silicate clay mineral, it is 1:1 type of mineral with

Nitrification is the microbial conversion of

A compound toxic to crop formed by the thermal decomposition of urea is

The exact chemical formula of DAP fertilizer is

The unit of electrical conductivity is

According to WAPDA, the ECe of the salt free soil should remain

The reaction of Na2 CO3 salt is

The EC: SAR and RSC values suggested by WAPDA for 3rd class irrigation water(C,S,R,) are

Most of the productive soils in Pakistan have pH

The exact formula for calculating the base saturation percentage is

The deficient level of N (%) in plants suggested by various workers is

The toxicity level of Zn (mg/kg) in plants suggested by some workers is

The chemical formula of Hematite is

The chemical formula of Dolomite is

The little clay mineral is

Auxins promote

The net reaction of photosynthesis is

Deep percolation from a soil profile is generally measured by a device known as

Solution containing molecular weight of a substance in gram per liter of a solution is known as

The particlesw density of a mineral soil is about

A soil with an ESP greater than 15 is usually classified as

The safe limit of No2 in drinking water is

pF unit is used for the measurement of

The device used for the measurement of positive pressure potential of soil water is known as

The symbol of Na stands for

Soil structure without aggregation is known as

The moisture content below which a cohesive soil does stick to metal tools is known as

The water loss through transpiration from vegetative and evaporation from soil surface is known as

Formula used for the calculation of sodium absorption ratio is

Perfect hardness of any mineral is determined by

Mean annual precipitation for tundra region is

Primary air pollution is

Equation of Ozone is

Algal photosynthesis increases pH of water and releases

The earth core is made of the following metals

The atmospheric layer lies closest to the earth surface is known as

Corrositivity of water is an indication of

Accumulation of soluble salts root zone is known as

Cyclic salts are mostly of

Na2CO3 salts is

Total salt affected soils of Pakistan are

Electrical conductivity of saturated paste is written as

Salt-tolerant plants are called

The science of growing terrestrial plants in an aerated solution is known as

Gold is

The wearing away of the land surface by wind, water, ice or other geological agents is called

Na and k can be determined by the use of

Material deposited by the wind is called

The problem of soil crosion Thal and Cholistan is predominantly due to

Rocks formed from molten magma are called

Addition of sodium hexametaphosphate in soil for determination of soil texture causes

Deficiency of B can be corrected through application of chemical fertilizer of

The process of accumulation of excess quantity of nutrients in water causing O2 deficiency is known as

Clear water with organic matter or sediment and minimum biological activity is known as

Chromium (Cr) is a

Sewage water consists of water and solids in the following percentage

Percentage of N in Ammonium sulphate fertilizer is

Percentage of N in Ammonium ritract fertilizer is

The available form of sulphur for plant is

Antioxidant is used to reduce the process of

The plant in which CO2 fixation is solely via the Calvin cycle is

Humic acid is soluble in

Gravimetric water is present in

TSP contains

Sugar cane is

Which silica mineral is present in soil in abundant quantity

The lower limit of available water is called

The exact formula for sodium hexametaphosphate is

[(NH4)2SO4FeSO66H2O] is the formula of

The chemical formula for Ammonium acctatc is

C12H12N-NaO8S2 is the chemical formula of

Boron concentration is irrigation water is considered safe only upto