Question

The possible beneficial effect of grazing animals is the
A. Removal of wild animals
B. Eradication of weeds
C. Removal of wild plants
D. Addition of their excreta to the soil

Answer 1

Animal excreta can enrich soil composition. This enriches organic matter to the soil so that it can provide essential mineral nutrition to the plants.

Complete answer: Grazing is a type of animal husbandry in which domestic livestock animals are allowed to consume wild vegetation so that they can convert grass and other infested items into the meat, milk, wool, and other products.
It is recommended to allow grazing on land unsuitable for farming and agriculture.
Grazing of animals could destroy the greenery of the land by consuming grass and other wild crops. Overgrazing is considered as a significant reason for desertification.
It leads to increased soil erosion and makes the soil compact but there is a positive effect of grazing even in agriculture too.

Moderate grazing can be beneficial because it leads to the addition of excreta of the animals into the soil.
This enriches organic matter to the soil so that it can provide essential mineral nutrition to the plants.

Note: Besides the above benefit, appropriate grazing can even restore or maintain native grass/herb diversity in an area that has been disturbed by overgrazing or human interference.