Plant Science Exam #3

​Plant Science Exam #3

By eduardo vaca

Multiple Choice

Which of the following is considered a non-mineral essential nutrient?

• Nitrogen

• Potassium

• Phosphorus

• Hydrogen

Multiple Choice

The three numbers on a fertilizer bag represent the percentage of Nitrogen, Phosphorus and Potassium, in that order.

• true

• false

Multiple Choice

To raise the pH of an acidic soil, which material would typically be applied?

• Elemental sulfur

• Ammonium sulfate

• Urea

• Lime

Match

Soil Water & Components Match each term in Column A with its best definition or description in Column B.

• Parent Material

• Physical Weathering

• Chemical Weathering

• Permanent Wilting Point (PWP)

• Transpiration

The geological stuff soil forms from.

Breaks rock into small pieces

Rock changes composition to break down

Point where a plant permanently wilts

Loss of water vapor from plants

• The geological stuff soil forms from.

• Breaks rock into small pieces

• Rock changes composition to break down

• Point where a plant permanently wilts

• Loss of water vapor from plants

Multiple Choice

When water moves through a clay soil very slowly, it is primarily due to:

• Large pore spaces

• Lack of gravitational pull

• Very small pore spaces and high surface area

• High organic matter content

Multiple Choice

The five major factors that control soil formation are:

• climate, time, parent material, topography and vegetation

• Water, wind, sunlight, temperature, and nutrients.

• Sand, silt, clay, organic matter, and air.

• Fertilizers, pesticides, tillage, irrigation, and drainage.

Multiple Choice

Physical weathering changes the chemical composition of rocks.

• true

• false

Multiple Choice

Which of the following is NOT one of the three basic soil separates?

• Sand

• Silt

• Clay

• Loam

Multiple Choice

The pH scale is an indicator of:

• Soil texture

• The concentration of essential nutrients

• The acidity or alkalinity of a substance

• Soil water content

Multiple Choice

Soil texture can be easily changed through typical agricultural management practices.

• true

• false

Multiple Choice

Capillary water is readily available to plants and is held in the soil against the force of gravity.

• true

• false

Multiple Choice

Humus is an excellent storage vehicle for plant nutrients due to its high cation exchange capacity.

• true

• false

Multiple Choice

Soil is best defined as:

• A collection of weathered rock fragments

• Decomposed organic matter

• Soil is the loose, top layer of the Earth where plants grow.

• Any medium used to support plant growth.

Multiple Choice

Nitrogen is considered an immobile nutrient within the plant, showing deficiency symptoms first on new growth.

• true

• false

Multiple Choice

Bacteria makes up the greatest mass of microorganisms in the soil.

• true

• false

Multiple Choice

Soil structure refers to:

• The relative proportions of sand, silt, and clay

• The arrangement of soil particles into aggregates

• The soil's ability to hold water

• The chemical composition of the soil

Multiple Choice

Clay particles typically have what electrical charge?

• Positive

• Negative

• Neutral

• Variable

Multiple Choice

If a soil has a pH of 8.5, it is considered:

• Acidic

• Neutral

• Alkaline

• Very strong acidic

Match

Plant Nutrients & Soil Components Match each term in Column A with one of its primary functions or characteristics in Column B.

• Nitrogen

• Phosphorus

• Potassium

• Calcium

• Humus

Mobile element for vigorous leaf growth

"Energy nutrient" for roots & flowering

For water, enzymes, and plant "health."

Essential for cell walls & division

Decomposed organic matter improves soil

• Mobile element for vigorous leaf growth

• "Energy nutrient" for roots & flowering

• For water, enzymes, and plant "health."

• Essential for cell walls & division

• Decomposed organic matter improves soil

Multiple Choice

The Law of the Minimum states that plant growth is limited by the essential nutrient that is:

• In shortest supply relative to the plant's need

• Most abundant in the soil

• Present in the largest quantity

• Most expensive to apply