This question was well attempted by the candidates. In 5(a) (i-ii), majority of the candidates were able to state the meaning and characteristics of natural pastures in West Africa. However in 5(b)(i-iv), most of the candidates could not discuss the root-knot disease of tomatoes under causal organism, mode of transmission, symptoms and prevention/control. Further to this, majority of the candidates could not distinguish between grafting and budding in plant propagation as required in 5(c). But in 5(d) majority of the candidates were able to give two uses of sugarcane.This question was well attempted by the candidates. In 5(a) (i-ii), majority of the candidates were able to state the meaning and characteristics of natural pastures in West Africa. However in 5(b)(i-iv), most of the candidates could not discuss the root-knot disease of tomatoes under causal organism, mode of transmission, symptoms and prevention/control. Further to this, majority of the candidates could not distinguish between grafting and budding in plant propagation as required in 5(c). But in 5(d) majority of the candidates were able to give two uses of sugarcane.
The expected answers include:
5 (b) Discussion on root-knot disease of Tomato
(i) Causal Organism
- Rootknot nematode/Meloidogyne spp.
(ii) Mode of Transmission
- Nematodes are soil borne so are transmitted through soil movement and run-off water
- Through vegetative planting materials/transplanting of seedling
- Through contaminated farm tools and equipment
- Symptoms
- Enlargement of certain cells of the roots in the form of knots
- Retarded growth
(iv) Prevention and control measures
- Crop rotation
- Use resistant varieties
- Use nematicides such as furadan
- Use of African marigold (biological control)
- Heavy doses of organic matter application
- Soil sterilization
(c) Distinction between grafting and budding in plant propagation
In grafting, the scion contains more than one bud, whereas; in budding, only one bud is used as scion.
This question was well attempted by the candidates. In 5(a) (i-ii), majority of the candidates were able to state the meaning and characteristics of natural pastures in West Africa. However in 5(b)(i-iv), most of the candidates could not discuss the root-knot disease of tomatoes under causal organism, mode of transmission, symptoms and prevention/control. Further to this, majority of the candidates could not distinguish between grafting and budding in plant propagation as required in 5(c). But in 5(d) majority of the candidates were able to give two uses of sugarcane.
The expected answers include:
5 (b) Discussion on root-knot disease of Tomato
(i) Causal Organism
- Rootknot nematode/Meloidogyne spp.
(ii) Mode of Transmission
- Nematodes are soil borne so are transmitted through soil movement and run-off water
- Through vegetative planting materials/transplanting of seedling
- Through contaminated farm tools and equipment
- Symptoms
- Enlargement of certain cells of the roots in the form of knots
- Retarded growth
(iv) Prevention and control measures
- Crop rotation
- Use resistant varieties
- Use nematicides such as furadan
- Use of African marigold (biological control)
- Heavy doses of organic matter application
- Soil sterilization
(c) Distinction between grafting and budding in plant propagation
In grafting, the scion contains more than one bud, whereas; in budding, only one bud is used as scion.
This question was well attempted by the candidates. In 5(a) (i-ii), majority of the candidates were able to state the meaning and characteristics of natural pastures in West Africa. However in 5(b)(i-iv), most of the candidates could not discuss the root-knot disease of tomatoes under causal organism, mode of transmission, symptoms and prevention/control. Further to this, majority of the candidates could not distinguish between grafting and budding in plant propagation as required in 5(c). But in 5(d) majority of the candidates were able to give two uses of sugarcane.
The expected answers include:
5 (b) Discussion on root-knot disease of Tomato
(i) Causal Organism
- Rootknot nematode/Meloidogyne spp.
(ii) Mode of Transmission
- Nematodes are soil borne so are transmitted through soil movement and run-off water
- Through vegetative planting materials/transplanting of seedling
- Through contaminated farm tools and equipment
- Symptoms
- Enlargement of certain cells of the roots in the form of knots
- Retarded growth
(iv) Prevention and control measures
- Crop rotation
- Use resistant varieties
- Use nematicides such as furadan
- Use of African marigold (biological control)
- Heavy doses of organic matter application
- Soil sterilization
(c) Distinction between grafting and budding in plant propagation
In grafting, the scion contains more than one bud, whereas; in budding, only one bud is used as scion.
The expected answers include:
5 (b) Discussion on root-knot disease of Tomato
(i) Causal Organism
- Rootknot nematode/Meloidogyne spp.
(ii) Mode of Transmission
- Nematodes are soil borne so are transmitted through soil movement and run-off water
- Through vegetative planting materials/transplanting of seedling
- Through contaminated farm tools and equipment
- Symptoms
- Enlargement of certain cells of the roots in the form of knots
- Retarded growth
(iv) Prevention and control measures
- Crop rotation
- Use resistant varieties
- Use nematicides such as furadan
- Use of African marigold (biological control)
- Heavy doses of organic matter application
- Soil sterilization
(c) Distinction between grafting and budding in plant propagation
In grafting, the scion contains more than one bud, whereas; in budding, only one bud is used as scion. |
