CBSE Class 9 Answered

the biological factors include the plants, animals and microorganisms.

(i)Living organisms have an extensive impact on soil.Roots from plant life dig deep into the soil, creating passages for water and air.

(ii)Animals such as ants, earthworms, rodents, and snakes dig and till the soil extensively. (iii)Plants and animals provide nutrients to the soil in the form of waste products and dead bodies.

(iv)A variety of micro-organisms perform important jobs in the soil that help to decompose living materials, and that give richness to the soil.