23. In order for plants to have adequate water (a). good infiltration, holding c

Question

23. In order for plants to have adequate water (a). good infiltration, holding capacity, (d). nts to have adequate water it is important for the soil to have on, (b). good water-holding capacity, (c). both good infiltration and water- pH 24 Saturating soil with water may kill (drown) plants because Ca). plant absorb too much water and bloat, (b). too much water leaches nutrients from the roots, ater saturating the soil prevents roots from getting oxygen, (e) all of the above 25. In many parts of the world, deserts are spreading largely because (a). overgrazing, (b). the climate is becoming hotter, (c). the climate is becoming drier, (d). the climate is becoming hotter and dryer, (e). of unknown causes 26. As water flows over the surface, it picks up and carries soil particles, or a uniorm loss of soil from the surface is called as a). splash crosion, b). sheet erosion, c). gully erosion, d). rivulet erosion, e). none of the above. 27. Soils which have a ph less than 8.5, Conductivity more than 4 memos/em, and a). Alkali soils, b). Saline-Alkali soils, c). Saline Soils, d). none of the above. 28. Soils which have pH generally between 8.5-10, Conductivity less than 4 mmhos/cm, and Exchangeable Sodium Percentage more than 15 are commonly referred to as a). Saline soils, b). Saline-Alkali soils, c). Alkali soils, d). none of the above 29. Soils which have pH generally about 8.5, Conductivity more than 4 mmhos/em, and Ecahangeable Sodium Percentage more than 15 are commonly referred to as a). Saline soils, b). Saline-Alkali soils, c). Alkali soils, d). none of the above 30. Percolation of water through soil will NOT remove a. clay particles, b. bacteria and other pathogenic organisms, c. salts and other chemicals whic are dissolved in the water, d. detritus, e. fecal wastes. 31. Which of the following is NOT a significant source of groundwater contamination? a. underground fuel storage tanks, b. application of road salts, c. fecal wastes generated in natural ecosystem, d. application of pesticides and fertilizers to farm lands, e. land fills containi refuse and chemical waste. 32. For a chemical to contaminate groundwater, it must a. dissolve in and/or be carried by percolating water, b. be lighter than water, c. be heavier t water, d. be insoluble, e. none of the above. 33. Which of the statement is False? contamination of groundwater with toxic chemicals result from a. use of agricultural chemicals, b. accidental spills of chemicals, c. storage of materials in the ground, d. disposal of chemicals in the ground, e. none of the above. 34. Commonly used methods of land disposal of toxic wastes do NOT include a. landfills, b. swamp filtration, c.deep well impoundments, d. surface impoundme

Explanation / Answer

23) (C) Both good infiltration and water holding capacity - Because infiltration is downward movement of water and water holding capacity is important factor.

24) (C) Plant Roots growing in saturated water or waterlogged soil area may die because they cannot absorb the oxygen needed to function normally.

25) (B) Due to greenhouse and global warming effect climate becoming hotter and creating desert area and its spreading.

26) (B) Sheet erosion -Its type of erosion, In this erosion uniform soil layer is removed from an area over the surface.

30) (B)

31) (B)

32) (A)

33) (C)

34) (B)

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