Exam 4: The Terrestrial Environment

In low-lying areas with poor drainage,________ results in a black or bluish-gray soil with a high organic content.

Microorganisms contribute to the formation of soils.

Coarse-textured soils have a low field capacity and a low wilting point.

A soil that is 10% silt,80% sand,and 10% clay would be considered

________ are positively charged particles in the soil that attract anions.

The available water capacity is highest for

________ is a property of soils that is determined by the different sizes and types of particles in soils.

A collection of natural bodies of earth,composed of mineral and organic matter and capable of supporting plant growth,is referred to as ________.

Clay soils have smaller pores and hold considerably less water than sandy soils.

A waxy layer coating the aerial parts of most plants,such as stems and leaves,which reduces water loss is referred to as the

In the temperate regions of the world,many forest tree species are ________,shedding their leaves during the winter months.

Entisols are immature soils associated with recently deposited sediments.

Distinct layers in the soil that are created by localized chemical and physical processes are called ________.

Most soils contain far more cations than anions.

Aluminum is toxic to plants because it

Dark clay soils that show significant expansion and contraction due to wetting and drying are referred to as

________ matter (particularly humus)makes soil dark or black.

The ________ point is the stage at which the moisture level in soil decreases to a level at which plants can no longer extract water.

Which wavelength of light penetrates through plant cover the farthest?

The soil-forming process occurring in cool,moist climates of midlatitude regions where coniferous vegetation dominates is referred to as