(a) Describe the life cycle of the variegated grasshopper. (b) List five ways through which...
(a) Describe the life cycle of the variegated grasshopper.
(b) List five ways through which diseases are spread on crop farms.
(c) List six characteristics of a good layer.
Explanation
a)Description of life cycle of the variegated grasshopper
-Adults male and female mate
-The female lays eggs underneath leaves
-The eggs hatch into nymphs around October/onset of dry season
- During the fourth instar stage, they migrate into the farm and continue to feed on leaves up to the adult stage
- It undergoes incomplete metamorphosis.
(b) Ways through which diseases are spread on crop farms
- Harbouring of pathogens by weeds
- Contaminated irrigation water
- Rain splash
- Insect vectors/pest infestation
- Use of infected planting materials Wind dispersal of pathogens
- Use of contaminated tools equipment
- Uncontrolled movement of visitors to the farm
- Animal dispersal of pathogens especially during feeding
- Dews
- Soil/soil borne pathogens
(c) Characteristics of a good layer
- Presence of short beak
- Large, bright red comb
- Soft and pliable abdomen
- Broad breast bone
- Broad and square head
- Large, oval, moist, warm and smooth vent
- Glossy plumage/feather
- Bright eyes
- Smooth and lean face
- Absence of cannibalistic behaviours
- Broad, flexible pelvic bones
- Dilating cloaca - Soft