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 Agricultural Science Paper 1, May/June 2008
 Questions: 1 2 3 4 Main
Weakness/Remedies
Strength

Question 3

• Identify specimens E, F, G and H.
• Name the part of the plant usually attacked by each of specimens E, F, G and H.
• Give two ways by which each of the specimens damages crops. State three methods of controlling specimen E.
• [2 marks] [2 marks] [8 marks] [3 marks]
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OBSERVATION
• This question was not easily tackled by the candidates. In 3(a), most of the candidates were unable to identify specimens E (Maize weevil); F (Cotton strainer bug/Dysdercus); G (Termite) and H (Grasshopper).
• In 3(b), some of the candidates could not name the part of the plant usually attacked by each of specimens E, F, G and H.
• Parts of plant attacked by specimen
• E     Maize grains

F          Cotton bolls/okro fruits/akee apple

• G    Crop stems/roots/grains of lodged Cereals
• H     Plants leaves and young shoots
• Also, in 3(c) and (d), majority of the candidates could neither give ways by which each of the specimens (i.e. E, F, G and H) damages crops nor state methods of controlling specimen E.
• Damages caused to crops:
• Bores into the grains of maize and creates holes Destroys the embryo and hence prevents germination Eats the endosperm and reduces food value
• Vents created serve as sites for secondary infections
• Specimen F (Dysdercus/cotton strainer bug)
• Pierces into mature cotton bolls/okro fruit/akee apple Stains the cotton lint
• Vents created serve as sites for secondary infection Prevents good fruit formation in okro
• Causes premature drop of fruits
• Specimen G (Termite)
• Chews the stem and roots of plants and tubers Destroys seed grains lying on the field
• Weakens the stem and roots of plants and makes them to lodge Also creates tunnels for secondary infection
• . Causes defoliation of crops
• Young shoots are destroyed
• Wounds left on the crops can serve as site for secondary infection Buds are also destroyed
• Reduces the photosynthetic ability of crop plants Reduces the growth of crop plants
• Methods of controlling specimens E (Maize Weevil
• Dry grains very well before storing Harvest early soon after prying
• Store grains in air-tight containers hermetic storage Apply pesticides to the grains before storage Fumigate storage facilities
• Using smoke to kill or ward off the weevils
• . Store grains in hot dried pepper/neem extracts