Plant Science Unit 4 (Part 1)

Which of the following best describes a vertical section of soil?

• A cross-section of soil from top to bottom

• A horizontal section of soil from side to side

• A diagonal section of soil from corner to corner

• A circular section of soil from center to edge

What are the three horizons of soil in order from top to bottom?

• A, B, C

• C, B, A

• A, C, B

• B, A, C

Which type of soil has the smallest particle size?

• Clay

• Silt

• Loam

• Sandy

What is the term for the point at which soil can no longer supply enough moisture to a plant?

• Permanent wilting point

• Field capacity

• Saturation water content

• Pore size

How does pore size affect field capacity, permanent wilting point, and saturation water content?

• Larger pore size increases field capacity, permanent wilting point, and saturation water content

• Smaller pore size increases field capacity, permanent wilting point, and saturation water content

• Larger pore size decreases field capacity, permanent wilting point, and saturation water content

• Smaller pore size decreases field capacity, permanent wilting point, and saturation water content

What is the role of precipitation in the water cycle?

• It replenishes the groundwater

• It evaporates to form clouds

• It is absorbed by plants through transpiration

• It creates runoff into rivers and oceans

How does transpiration from plants affect the water cycle?

• It increases evaporation from the soil

• It decreases the amount of water available for precipitation

• It increases the amount of water stored in groundwater

• It has no effect on the water cycle

What is the term for water that flows over the land surface and into streams and rivers?

• Condensation

• Transpiration

• Evaporation

• Runoff

What is the term for water that is stored beneath the Earth's surface?

• Condensation

• Transpiration

• Evaporation

• Groundwater

How does the pH of soil affect nutrient availability for plants?

• Acidic soil promotes nutrient absorption

• Alkaline soil promotes nutrient absorption

• Acidic soil inhibits nutrient absorption

• Alkaline soil inhibits nutrient absorption