Author Question: An important role played by humus in the soil is: a. as a catalyst in chemical reactions by which ... (Read 103 times)

a0266361136 · **on:** Aug 7, 2018

An important role played by humus in the soil is:
a. as a catalyst in chemical reactions by which plants extract nutrients from the soil.
b. as an improver of soil structure and water retention.
c. as a source of food for microscopic soil organisms.
d. all of these

Question 2

The ecosystem concept can be applied on almost any scale.
a. True
b. False
Indicate whether the statement is true or false