Explanation

(a)(i) Name of toxic substance found in specimen G (Fresh cassava tuber):

• - Hydrogen cyanide/cyanide/prussic acid/Hydrocyanic.

(ii) Ways of removing hydrogen cyanide in fresh cassava tubers:

• Grating the tubers and squeezing out the water under pressure for few days
• Soaking the tubers in water for some days/ fermentation,
• Drying the soaked tubers in water for some days/fermentation,
• Drying the soaked tubers in the sun,
• Boiling/cooking the tubers,
• Frying.

(b) Uses of specimen I (Onion bulbs) and J (Pepper fruits):

I (Onion bulbs);

• Sources of vitamins A and C.
• For flavouring food,
• Medicinal uses,
• Source of volatile oil,
• Eaten as food,
• Antioxidant,
• Boost digestion,
• Nourish the skin, 
• To repel snakes around the home.

J(Pepper fruits):

• Spice for food,
• Insect repellant in stored produce,
• Medicinal uses,
• Used as yolk colourant,
• Source of antioxidant (piperine),
• Used in tear gas to disperse crowds/ as pepper spray.

(c) Pest of specimen L (Onion bulbs):

• Grasshopper.
• Cricket,
• Cockroach,
• Monkey,
• Thrips,
• Rat/Rodents,
• Maggot. 
• Eelworm

(d) Group of crops to which specimens I(Onion bulbs) and J (Pepper fruits) belong based on their uses;

• Spices
• Vegetables

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