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- Plants obtain ______ by taking it up from the air. a. nitrogen c. phosphorus b. carbon d. waterWhich essential chemical must be “fixed” by soil-dwelling bacteria before it can enter the food chain? a. Carbon b. Nitrogen c. Phosphorous d. Both a. and b.Which one is not a pollutant normally? (a) hydrocarbon (b) carbon dioxide (c) carbon monoxide (d) sulphur dioxide.
- Which of the following is a biotic factor? a. wind b. disease-causing microbe c. temperature d. soil particle sizeHow can primary sewage treatment be used as a source of biofuel? a.Fermentation of BOD allows ethanol to be produced b.After primary treatment, the water is clean enough to use for hydrogen fuel c.Lipids that collect on the surface can be collected for biodiesel d.The trickling filters captures sludge that can be used for hydrogen fuelName the pollutants that cannot be broken down to simple and harmless products.
- Decomposing organic matter in soil is called______ . a. clay d. silt b. humus e. sand c. topsoil f. leachingWhat fraction of the soil represents the most active? A. Clay B. Pore spaces C. Humus D. Soil colloidsWhich of the following statements is NOT as description of soil? A. Varying nutritional content. B. Phototropic microbes are found only on the top few centimeters. C. A homogenous layer of organic and inorganic material. D. The area around the plant soil usually has the highest microbial populations.
- fertilizers are necessary if the soil lacks one of the following nutrients: a. calcium, carbon, potassium b. nitrogen phosphorus, potassium c. nitrogen, phosphorus, magnesium d. nitrogen, calcium, magnesium e. phosphorus, potassium, magnesiumHow do you think a farmer can best help to conservesoil? How do you think a scientist can best help to conservesoil? How do you think a national government canbest help to conserve soil?The process whereby nitrogen is brought into organic molecules is called ________. a. nitrification b. denitrification c. nitrogen fixation d. nitrogen cycling