Agricultural Science
WAEC 2020
(a) Give three reasons for stocking K (TILAPIA) and L (CATFISH) together in a pond.
(b) List four fishing gears used for harvesting specimens K and L in a pond.
(c) Name four products that could be made from specimen M(MILK).
(d) State four reasons for adding specimen N (LIME) to the pond in which specimens K and L are stocked.
Explanation
a) Reasons for stocking specimens K(Tilapia) and L(Catfish) together in a pond:
- Tilapia and catfish can co-exist successfully in ponds,
- Tilapia and catfish have different feeding habits,
- Tilapia is herbivorous while catfish is carnivorous,
- Tilapia is a surface feeder while catfish is a bottom feeder,
- Catfish checks/controls the population of tilapia which multiplies at a very fast rate and could overpopulate the pond,
- Optimizing farmers' income/ harvest,
- To ensure adequate utilization of the pond's space.
(b) Fishing gears used for harvesting specimens K (Tilapia) and L (Catfish) in a pond:
- Hook and line,
- Fish trap
- Fishing gourd
- Use of nets e.g seine net, drag net, scoop net, cast net,
- fishing spear/harpoons
- basket
(c) Products that could be made from specimen M (milk):
- Cheese,
- Yoghurt,
- Skimmed milk/ condensed/ can milk,
- Casein,
- Butter scotch,
- Butter,
- Ice cream,
- Whey,
- Milk Candy.
(d) Reasons for adding specimen N (Lime) to the pond in which specimens K(Tilapia) and L(Catfish) are stocked:
- Reduces pond acidity,
- Reduces pond turbidity,
- Makes fertilizers to be effective,
- Supplies calcium for fish bone development,
- Destroys leeches on tilapia and catfish skin,
- To seal pores and prevent water loss,
- To increase the availability of nutrient such as phosphorus in ponds with acid soil,
- It reduces free carbon dioxide in pond water,
- To encourage the growth of planktons.
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