Question

4.-------------------- increase the soil productivity? A) Earthworm B) Planaria C) Sponges D) Molluscks

Answer 1

A) earthworms.

Explanation:

Earthworm's benefit soil nutrient availability, water and air movement, soil structure and soil productivity. Their activity is beneficial because it can enhance soil nutrient cycling through the rapid incorporation of detritus into mineral soils.

Mucus production associated with water excretion in earthworm guts also enhances the activity of other beneficial soil microorganisms. They also increase nitrogen mineralisation, through direct and indirect efforts on the microbial community.