Soil Properties MCQ Quiz

The study of soil as a natural entity, focusing on origin, classification, and description, is called:

• Pedology

• Edaphology

• Geology

• Soil Science

Which branch of soil science is concerned mainly with plant growth?

• Pedology

• Edaphology

• Pedogenesis

• Geomorphology

Soil is considered a three-phase system consisting of:

• Solids, gases, nutrients

• Solids, liquids, gases

• Minerals, organics, nutrients

• Rocks, water, air

What percentage of mineral matter generally composes agricultural soil?

• 25%

• 45%

• 5%

• 20%

Organic matter in soil primarily originates from:

• Rocks and minerals

• Plants and animals

• Gases in the atmosphere

• Parent material only

Which soil component usually has higher CO₂ content compared to the atmosphere?

• Soil water

• Soil air

• Soil solids

• Soil colloids

Which best describes soil pore spaces?

• Occupied only by air

• Occupied only by water

• Occupied by air and water interchangeably

• Always filled with gases

A soil with 25% water, 25% air, and 50% solids is considered:

• Ideal soil

• Poorly drained

• Compact soil

• Organic-rich soil

A soil scientist studying soil classification and mapping is best called:

• Edaphologist

• Pedologist

• Petrologist

• Hydrologist

Which soil component is responsible for carrying nutrients in solution form?

• Soil solids

• Soil air

• Soil water

• Soil colloids