Test: Soil - Class 7 MCQ

Climate, vegetation, and human activities are important factors affecting soil formation.

Deforestation, overgrazing, and construction activities can cause soil erosion.

Soil is a mixture of minerals, organic matter, air, and water that supports plant life.

Time is not a factor affecting soil formation. The other three factors are parent material, climate, and topography.

Air is not a type of soil. The other three options are types of soil.

Clay has the smallest particles of the four types of soil.

Sand has the largest particles of the four types of soil.

Soil color is not a factor affecting soil suitability for crops. The other three options are factors that affect soil suitability for crops.

Erosion involves the movement of soil particles from one place to another by factors like wind or water.

Loam soil has a balanced mixture of sand, silt, and clay, which makes it ideal for growing crops and has the highest nutrient content among the three main types of soil.

Clay soil is best for retaining moisture as it has smaller particles that can hold onto water more effectively.

Aggregation is the process of soil particles sticking together to form larger clumps or aggregates.

Sandy soil is most prone to erosion as it has larger particles that can be easily carried away by wind or water.

The ideal pH range for most crops to grow in soil is between 6.0 and 7.5.

Sandy soil is good for water drainage as it allows water to flow through easily.

Clay soil has the smallest particles among the three main types of soil.

Soil structure refers to the arrangement of soil particles and how they are held together.

Topsoil contains the most organic matter and is the layer where most of the plant roots are found.

Loam soil is best suited for growing crops as it has a balanced mixture of sand, silt, and clay.

Soil erosion is caused by factors like wind, water, and human activities.