nent-holding capacity of the soil has the most effect on (a). the amount of nutr

Question

nent-holding capacity of the soil has the most effect on (a). the amount of nutrients nutrients may be leached from the soil, (c). how readily nutrients may 11. Nutr present, (b). how readily be absorbed by plants, (d). how readily nutrient may be broken down, (e). the maximum amount of nutrients that may be added to the soil at any one time 12. Water will not exist as a) a solid, b). a liquid, c), a gas, d) separate oxygen and hydrogen atoms 13. Which of the statement is False? In the evaporation of water a). there is a increase in kinetic energy of the water molecules, b). there is a braking of the hydrogen bonds between water mo lecules, c). water mo lecules separate from each other, d). water molecules break up into separate oxygen and hydrogen atoms, e). none of the above 14. Following the pathway of water in the water cycle, condensation leads most directly to a). evaporation, b). precipitation, c). transpiration, d). groundwater, e). infiltration 15. Many freshwater wells in coastal areas now yield salty water. The main cause of this problem is a). rising sea level, b). excessive use of road salt, c). excessive removal of fresh water is permitting salt water to move backwards into aquifers, d), improve sewage treatment, e). not known 16. A falling water table may be caused by a), excessive with drawl of groundwater, b), increasing runoff, c). decreasing infiltration, d). all of the above 17. The term is used to describe the resistance of a soil at various moisture contents to mechanical stresses or manipulations is a). porosity, b). infiltration, c). soil persistency, d). soil consistency, e). none of the above 18. The attraction of ions or compounds to the surface of a solid is a). absorption, b). adsporption, c). desorption, d). eluviations, e). none of the above 19. The gradual breakdown of rock into soil particles by natural factors is called (a). leaching, (b). abrading, (c). weathering, (d). degradation, (e). fracturing 20. directly from (a). weathering, (b). decay of organic matter, (c). leaching, (d). acidification, (e) none of th above In a natural ecosystem, most of the nutrients absorbed from the soil by plants come most 21. Nutrient-holding capacity of the soil has the most effect on (a). the amount of nutrients present, (b). how readily nutrients may be leached from the soil, how readily nutrients may be absorbed by plants, (d). how readily nutrient may be broken do (e), the maximum amount of nutrients that may be added to the soil at any one time 22. A deep dry layer of porous rock is a necessary feature for a. deep well injection, b. surface impoundments, c. landfills, d. all of the above

Explanation / Answer

ANSWER 11:
Nutrient holding capacity of the soil may be defined as the amount of nutrient the soil can retain in order to supply it to the roots. So , at any point of time the maximum amount of nutrient the soil can hold.
Hence,option (e) is correct

ANSWER 12 :

Water molecule is composed of two atoms of hydrogen and one atom of oxygen. It exists in solid state in the form of ice , liquid form and in gaseous form in the form of vapour.

But water cannot exists when oxygen and hydrogen atom are seperate. Hemce , option (d) is the correct answer.

ANSWER 13:

When evaporation takes place , there is no change in chemical property of water molecule . Its physical state changes from liquid to gaseous state. Consequently , there is no change is no breaking up of oxygen and hydrogen atom seperately. Hence the option which is false is option (d).

ANSWER 14 :

Water cycle is a natural phenomenon which determines the flow of water on this planet. Condensation converts the water vapour back into liquid form. It leads directly to precipitation.Hence , option (b) is the correct answer.

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