Q. Which of the following statement on soil profile is/are correct?

1. O horizon is present in all types of soil.
2. E horizon is often found in older and forest soils.
3. C horizon contains the parent material of the soil.

Choose the correct answer using the codes given below:
Answer: Only 2 & 3
Notes: Soil is the uppermost layer of the earth's crust, composed of organic matter and rock particles that support life. A soil profile consists of layers called soil horizons: O (humus, organic matter), A (topsoil, minerals with organic matter), E (eluviated, leached of clay and minerals), B (subsoil, mineral accumulation), C (parent material, soil's source), and R (bedrock, solid rock beneath the soil).