Soil Review

Which of these particles in soil has the most water retention?

• clay
• gravel
• silt
• sand

How does nutrients necessary for plant growth get in the soil?

• Soil absorbs sunlight.
• Soil is exposed to oxygen.
• Organic matter is decayed in the soil
• Water flows through the soil.

The texture of soil depends on the:

• mass
• water in the soil
• plants growing in the soil
• composition of the soil

Some plants need to be in an environment where water drained easily. What type of soil would benefit these plants?

• sand
• shale
• clay
• silt

When a microorganism depletes oxygen in soil, the soil becomes:

• dense
• dried out
• anaerobic
• aerobic

Which element cause soil to appear red?

• calcium
• iron
• silicon
• nickel

The finest grain soil is richest in:

• clay
• humus
• sand
• iron

A plant that needs well drained soil would grow best in soil made of mostly of:

• clay
• humus
• silt
• sand

In order to increase water retention, you should add the following to soil:

• organic matter
• loose gravel
• nitrogen pellets
• coarse sand

The best soil mixture for plant growth and drainage is:

• silt, pebbles, and clay
• sand, rocks, and clay
• humus, clay, and sand
• clay, silt, and rocks