1) The total mass of living organisms in the soil a) Mycorrhizal fungi b) Soil biomass c) Denitrification d) Parasite 2) The process by which soil organic matter is converted to humus a) Mycorrhizal fungi b) Mutualistic relationship c) Symbiotic relationship d) Humification 3) Where different organisms live in a close relationshhip a) Symbiotic relationship b) Catch crop c) Rhizobium d) Humification 4) both organisms benefit from the relationship a) Rhizosphere b) Soil biomass c) Humification d) Mutualistic relationship 5) The zone of soil surrounding a plant root Ithat is the most biologically active part of a soil with microorganisms benefitting from the chemical compounds released by the plant roots a) Mycorrhizal fungi b) Carbon sequestration c) Rhizosphere d) Nitrogen fixation 6) An organism that lives on another organism benefitting at the expense of the hose and may cause harm to the host a) Catch crop b) Parasite c) Minimum tillage (Min-till) d) Carbon sequestration 7) Dead remains of plants and animals a) Catch crop b) Nitrogen fixation c) Parasite d) Organic matter 8) Fungi that enhance the water-holding capacity of the soil, help bind soil particles together and have a selective intake of minerals, preventing toxity fro heavy metals a) Symbiotic relationship b) Mycorrhizal fungi c) Nitrification d) Catch crop 9) The process whereby carbon dioxide is remove from the atmosphere a) Catch crop b) Parasite c) Nitrification d) Carbon sequestration 10) When a crust forms on a soil surface and reduces the permeability of a soil. a) Mycorrhizal fungi b) Soil capping c) Humification d) Soil biomass 11) Crops grown between two successive crops when land would otherwise be idle a) Mycorrhizal fungi b) Nitrification c) Carbon sequestration d) Catch crop 12) Cultivation of soil that does not involve ploughing. a) Mycorrhizal fungi b) Minimum tillage (Min-till) c) Mutualistic relationship d) Soil capping

Biological characteristics of soil 1

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