PLS #2- Chapter #8- CEC Video Quizzizz

What are the primary components that make up soil?

• Water, air, and organic matter

• Sand, silt, clay, and organic matter

• Rocks, minerals, and decomposed plants

• Nutrients, chemicals, and microorganisms

How does the surface area of clay particles compare to that of sand particles, given their relative sizes?

• Clay particles are larger and have less surface area than sand.

• Clay particles are smaller but have significantly more external surface area than sand.

• Clay and sand particles have similar surface areas despite different sizes.

• Sand particles are smaller and have more surface area than clay.

Which term describes positively charged chemical nutrients found in soil, such as calcium, magnesium, and potassium?

• Anions

• Isotopes

• Cations

• Molecules

What is the typical electrical charge of most clay particles and organic matter in soil?

• Positively charged

• Negatively charged

• Neutrally charged

• Variable, depending on soil pH

What prevents positively charged nutrients from immediately leaching out of typical soil when it rains?

• They are permanently bonded to sand particles.

• They are surrounded by a hydration sphere, preventing permanent bonding.

• They are electrostatically attracted to negatively charged clay and organic matter particles.

• They are absorbed by plant roots as soon as they become available.

How do plants typically acquire essential cations from soil particles?

• By directly absorbing them through osmosis.

• By producing hydrogen cations to exchange for other cations.

• By releasing enzymes that break down soil particles.

• By increasing the soil's positive charge to attract nutrients.

Which characteristic of a cation makes it more difficult for plants to exchange or trade it from soil particles?

• A larger size and lower positive charge.

• A smaller size and higher positive charge.

• A neutral charge and large size.

• A negative charge, regardless of size.

Why do negatively charged nutrients like nitrate and sulfate tend to leach out of most soils when watered?

• They are too large to be held by soil particles.

• They are repelled by the negatively charged soil particles.

• They form strong bonds with water molecules, making them unavailable.

• Plants do not require these nutrients, so they remain in the soil solution.

What two factors primarily determine a soil's Cation Exchange Capacity (CEC)?

• Soil color and texture.

• Particle size and organic matter content.

• Electronegativity and surface area.

• Water retention and nutrient concentration.

How can farmers effectively grow crops in soils with low Cation Exchange Capacity (CEC)?

• By applying large amounts of fertilizer less frequently.

• By relying solely on natural nutrient cycling without added fertilizers.

• By fertilizing more often using smaller amounts.

• By planting crops that do not require any nutrients.