(a)(i) Name the toxic substance found in specimen G (FRESH CASSAVA TUBER).
(ii) Suggest four ways of removing the toxic substance named in (a)(i).
(b) State two uses each of specimens I (ONION BULBS) and J (PEPPER FRUITS).
(c) List four pests of specimen I.
(d) Name two groups of crops to which specimens I and J belong based on their uses.
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