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Living Organisms and Soil Environment

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Questions and Answers

Where is water typically held in soil?

in the R Horizon

as a film on the surface of soil particles or in pore spaces (correct)

in the macropores

in the B Horizon

What can happen to plants unsuited to poor drainage in a soil?

They will grow rapidly

They will suffer from lack of oxygen (correct)

They will produce more roots

They will absorb more water

What is the primary function of air in soil?

to provide nutrients to plants

to regulate soil temperature

to support the respiration of plant roots and soil fauna (correct)

to absorb water

What is the characteristic of the A Horizon (Topsoil) that aids drainage?

It drains more freely than subsoil (C) Signup and view all the answers

What is the main difference between the A Horizon and the B Horizon?

The A Horizon has more organic matter and humus (A) Signup and view all the answers

What is the R Horizon composed of?

Consolidated rock (A) Signup and view all the answers

What is the primary source of nitrogen available to plants in the soil?

Decomposition of organic matter (A) Signup and view all the answers

How many nutrients are essential for plant growth?

15 (D) Signup and view all the answers

What is the main difference between major and minor nutrients?

Major nutrients are required in large amounts, minor nutrients in smaller amounts (C) Signup and view all the answers

Why is it important to consider the levels of nutrients when applying fertiliser?

To prevent toxicity to plants (A) Signup and view all the answers

What is the function of enzymes in plants?

To act as catalysts and control chemical reactions (A) Signup and view all the answers

Which of the following is NOT one of the major nutrients?

Manganese (Mn) (A) Signup and view all the answers

What is nitrogen responsible for in plants?

Boosting green leaf and stem growth (B) Signup and view all the answers

What is a symptom of nitrogen deficiency in plants?

Yellowing of leaves (D) Signup and view all the answers

What is phosphorus a component of?

DNA (A) Signup and view all the answers

What is a characteristic of phosphorus-deficient plants?

Dark green leaves with purple veins (A) Signup and view all the answers

What type of soil is likely to be deficient in potassium?

Soil with low clay content (A) Signup and view all the answers

What happens to the plant's requirement for phosphorus as it reaches maturity?

It declines (C) Signup and view all the answers