Question 3
(a) State the botanical names of each of the crops from which specimens I, J, K and L
were obtained. [4 marks]
(b) Classify each of specimens I, J, K and L according to their uses. [4 marks]
(c) Outline the steps involved in the processing of specimen I to obtain
vegetable oil. [4 marks]
(d) List three diseases of the crop from which specimen K was obtained. [3 marks]
Observation
Candidates’ performance in Question 3 was below average due to
(a) failure of candidates to adhere to the scientific convention of writing
botanical names and wrong spellings;
(b) inadequate knowledge of classification of crops based on their uses;
(c) failure to sequentially outline the steps involved in processing groundnut
into vegetable oil;
(d) lack of knowledge of diseases of oil palm.
The expected answers include:
3. (a) Botanical names of crops from which specimens I (Groundnut seeds), J (Cotton lint) and
K (Oil palm fruit) and L (Rubber latex) were obtained
Specimen I (Groundnut) - Arachis hypogea
Specimen J (Cotton) - Gossypium spp
Specimen K (Oil palm) - Elaeis guineensis
Specimen L (Rubber) - Hevea brasiliensis
(b) Classification of specimens I (Groundnut seeds), J (Cotton lint), K (Oil palm fruit) and
L (Rubber latex) according to their uses
Specimen I (Groundnut seeds) - Legume/pulse/grain legume/Oil crop
Specimen J (Cotton lint) - Fibre crop/Oil crop
Specimen K (Oil palm fruit) - Oil crop
Specimen L (Rubber latex) - Latex crop
(c) Steps involved in the processing of specimen I (Groundnut seeds) to obtain vegetable oil
- Drying
- Threshing /dehulling/picking
- Winnowing
- Shelling/decortication
- Winnowing
- Roasting
- Milling/pressing/pounding
- Oil extraction/Filtration
(d) Diseases of the crop from which specimen K (Oil palm fruit) was obtained
- Anthracnose
- Leaf spot/Freckle
- Ganoderma disease/Galadema
- Algae spot
- Blast
- Vascular wilt
- Brown Germ