Horizon(s) important for plant growth is (are):Question 9Select one:a.B and Cb.Rc.A and Od.E

To determine which soil horizons are important for plant growth, let's break down the options provided:

1. Horizon A (Topsoil): This is the uppermost layer of soil, rich in organic material and nutrients. It is crucial for plant growth as it contains the highest concentration of organic matter and microorganisms.

2. Horizon B (Subsoil): This layer lies beneath the topsoil and contains minerals leached from the A horizon. It has less organic material but is important for storing nutrients and water.

3. Horizon C (Parent Material): This layer consists of weathered parent material from which the soil is formed. It has minimal organic material and is less important for plant growth compared to the A and B horizons.

4. Horizon O (Organic Layer): This layer is composed of organic matter such as decomposed leaves and other plant material. It is very important for plant growth as it provides essential nutrients.

5. Horizon R (Bedrock): This is the unweathered rock layer beneath all the other horizons. It is not directly important for plant growth as it does not contain soil or nutrients.

Given these descriptions, the horizons important for plant growth are:

• A (Topsoil)
• O (Organic Layer)
• B (Subsoil)

Now, let's match these to the options provided:

a. B and C b. R c. A and O d. E

The correct answer is:

c. A and O

These horizons are crucial for providing the nutrients and organic matter necessary for plant growth.