Question

(A)-The uppermost layer is topsoil which is exposed to
air and it bears plants on it.
Reason(R)- Topsoil contains a lot of humus. Humus makes the soil
fertile.

Answer 1

Answer:

yes this statement is true

Answer 2

Topsoil

Explanation:

• The layers of the soil are called horizons.
• The uppermost horizon is known as topsoil layer.
• It is the mixture of sand, silt, clay and broken down organic matter called humus.
• Humus is rich highly decomposed organic matter mostly made from dead plants, leaves , twigs and insects.
• Humus makes the soil more fertile.
• Hence both assertion and reason are correct.