Soil and Agriculture — Unit test Answers

Rainforests are not exclusively found near the equator.

Which of the following statements about human impact on trees is true?a.Human activity always has a negative impact on trees.b.All human uses of trees require destruction of the trees.c.Human activity has had both a positive and negative impact on trees.d.Cutting down trees is the only activity that has a negative impact on trees.

How do trees improve water quality?a.Tree roots anchor soil in place, preventing runoff.b.Water is filtered as it passes through the root systems of trees.c.An adult tree can store nearly 250 gallons of water.d.All of the above

Which of the following is the most damaging method of soil remediation?a.soil excavation and disposalb.soil aerationc.heating and vapor extractiond.microbial digestion

Dutch agriculture is one of the most labor intensive types of agriculture in the world.

Why might soils rich in organic matter not be fertile?a.Soil fertility comes from a balance of organic matter and other mineral nutrients.b.Large amounts of organic material make soil retain too little water.c.Soil fertility is a result of the inorganic minerals present.d.Soils rich in organic material are always highly fertile.

Which of the following is not true concerning rainforests?a.Twenty-five percent of western pharmaceuticals are derived from rainforest ingredients.b.Almost 50,000 rainforest species are lost every year due to deforestation.c.Half of all rainforest plants have been tested for their medicinal properties.d.Projections say rainforest deforestation could eliminate half of the world’s species.

Which of the following forest management practices is the most harmful to forest ecosystems?a.clearcuttingb.shelterwood cuttingc.group selectiond.single tree selection

The main characteristic of a carbon sink is that _______.a.it emits no carbonb.it absorbs no carbonc.it emits more carbon than it absorbsd.it absorbs more carbon than it emits

Salinization increases the concentration of _______ in soil.a.plantsb.nutrientsc.saltd.water

The promotion of companies’ sustainably harvested rainforest products is intended to _______.a.produce cheaper productsb.promote overconsumptionc.give the company a competitive advantaged.produce more expensive products

Which of the following statements about forestry education is true?a.All educational facilities cover forestry to the same depth.b.Individuals can pursue doctorates in forestry in any state.c.Program focus will remain the same from state to state.d.Some states have greater access to forestry programs than others.

Which of the following best describes the use of rainforest plants as anticancer drugs?a.Most rainforest plants have been tested for their cancer fighting properties.b.Twenty-five percent of the active ingredients in cancer drugs are exclusively rainforest plants.c.The most powerful anticancer drugs are not rainforest plants.d.All of the above

Why is volcanic soil (andisol) very fertile?a.It is rich in minerals from volcanic deposits.b.It is a young soil with low water retention.c.It has been leached of mineral nutrients.d.Volcanic activity warms the soil.

What percent of the trees cut down are used for something other than paper?a.35%b.45%c.55%d.65%