Explanation

(a)) ldentification of specimens:

• B - Worm Cast.
• C - Ant hill.

(b) The soil organism which produces specimen B is earthworm while the one that produces specimen C is termite.

(c)(i) Four beneficial effects of organism producing specimen B on Agriculture are:

• It helps in the decomposition of organic matter in the soil
• It mixes soil mineral matter with organic matter
• It improves the structure of the soil
• It also improves the aeration of the soil

(ii) Four beneficial effects of organisms producing specimen C on Agriculture include:  

• lt It helps in the decomposition of organic matter in the soil
• They improve the soil structure
• They improve soil aeration.
• When they die, they add organic matter to the soil.

(d) lt is advisable to discourage the multiplication of the organism which produces specimen C in a farm for the following reasons;

• They shift large amount of sub-soil to the surface thereby, forming ant hill which limits cultivable space
• They destroy crop plants
• They destroy wooden handles of farm tools.
• They create wounds which serve entry point for disease pathogen on crop plants.

(e) Two other soil organisms are: (i) Millipede and (ii) Nematode 
(i) Effects of Millipedes on the soil

• They aid decomposition of organic matter
• They improve the structure of the soil
• They allow easy percolation of water.
• They improve soil aeration

(ii) Effects of Nematodes on the soil;

• They help to improve the aeration of the soil.
• They aid percolation of water
• They improve the soil structure
• Some are pests on major crops

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