Question

Match the following and choose the correct option:

i. A - horizon a. Small lumps of rocks

ii. B - horizon b. Hard layer which is difficult to dig

iii. C - horizon c. Dark in colour and rich in humus

iv. R -horizon d. Less humus and more minerals, compact

• A. i - a; ii - b; iii - c; iv - d
• B. i - b; ii - c; iii - a; iv - d
• C. i - c; ii - d; iii - a; iv - b
• D. i - d; ii - c; iii - b; iv - a

Answer 1

The correct option is C

i - c; ii - d; iii - a; iv - b

Horizon A is the topmost layer of soil. It is dark in colour due to the presence of a large amount of humus. It makes the soil nutrient rich and fertile. The layer is soft, porous and can retain more water.

Horizon B is the layer below horizon A and has less quantity of humus but at the same time, it contains more minerals.

Horizon C is the third layer which is composed of partially eroded small lumps of rocks.

Bedrock (horizon R) is the layer below horizon C and is very hard and difficult to dig through.