2. Which process involves the conversion of ammonia (NH₃) into nitrite (NO₂⁻) and then into nitrate (NO₃⁻)?

3. What is the process by which plants absorb nitrates from the soil and incorporate them into plant proteins?

4. Which process reduces nitrates back into nitrogen gas (N₂), releasing it into the atmosphere?

This process occurs when decomposers break down organic nitrogen compounds from dead organisms and waste, converting them into ammonia (NH₃) or ammonium (NH₄⁺).

This topmost soil layer is rich in organic material like decomposed leaves and plant matter, often dark and loose in texture. Known as the organic layer.

This layer, just beneath the organic-rich surface, is where most plant roots grow and biological activity occurs; it contains a mix of decomposed organic material (humus) and minerals. Also known as the topsoil.

This layer accumulates materials like clay, iron, and minerals that leach down from the layers above. It has very little organic material. Also known as the subsoil.

This deepest layer consists mostly of weathered parent rock and has little to no organic material; it's the foundation for soil development. Sometimes called bedrock.

Which of the following is the correct order of soil particles in order of increasing particle size?

Which of the following has the least permeability?

Which soil component has the least capacity for holding water?

Which soil has 40% sand, 30% silt, and 30% clay?

What type of soil contains 40% sand, 50% silt, and 10% clay?

Soils that hold water well typically have a lot of?