Waec Gce Expo 2017 Agric Science Obj And Theory Answers – Nov/Dec Expo
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1ai) unpredictable climate
i)Droughts or prolong periods without rain results in poor yields
ii)Flooding results in erosion
iii)Inadequate sunshine also reduces photosynthetic ability of plants
1aii) inadequate rural infrastructure
i)This results in urban drift ie massive exodus to big cities for better standard of living.
ii)Results to massive reduction in agricultural work force in rural settings
iii)Results in low agricultural production
1aiii)
Waec Gce 2017 Agric Science Theory Answers
Diseases
i)Result in increase in agricultural cost of production
ii)Reduce the quality of farm produce
iii)Reduce farmers income
1bi)
i)Contour ditch
ii)Border dyke
iii)Furrow irrigation
iv)Wild flooding
1bii)
i)High salt problems or salinity of soil which prevents proper growth of crops
ii)Transmissions of diseases is possible
iii)There is a build up and spread of pests
iv)Pollution of the environment is possible
v)There is high cost of equipment
2a)
i)Economic factor: most farmers are poor and cannot offered to buy machines such as tractors, plough, ridges,narrows, harvester
ii)Technical know-how;most farmers jack the required knowledge and skills to operate sophisticated machines
iii)small farm holdings ;is not economical for small scale farmers since it is very expensive to operate
2b)
i)piercing and sucking crop pests;these pest (mostly insects)have mouth parts that are modified and adapted for piercing and sucking plant tissues example of them are aphid, moths, cotton, strainers, cospid bug, mealy bug, cocoa thrip e.t.c
ii)biting and chewing crop pests;these are mostly vertebrates and invertebrates pests that posses strong mouth parts adapted to their mode feeding example are grasshopper, cricket, termites, army worm, Monkey, e.t.c
iii)boring crop pests;these are inside pests whose mouth parts are adopted for boring holes and destroying tissues of seeds stem and fruits example are weeds, stem, fruit fly and beetles.
READ: WAEC GCE 2017 Agricultural Science (Agric Practical) Specimens
3ai)
i)Long lactation periods
ii)Immunity and resistance from diseases
iii)Healthy variety
iv)Long life
3aii)
i)Camels
ii)Horses
3aiii)
i)It can perform more tedious jobs than man.
ii)It can handle many farm operations.
iii)It can be controlled or easy to operate.
iv)They are much stronger than man.
COMPLETE THE TABLE
3b)
Symptoms
i)angular spots on leaves
ii)death of shoots and rotting bolls
iii)distortion of leaves
iv)leaf curl
Control Measure
i)remove and burn infected plants
ii)grow resistant varieties
iii)spray with insecticides
iv)up root and burn infected plants
4a)
i)Sunlight
ii)Temperature
iii)Rain
iv)Water or Humidity
v)Soil or water chemistry
vi) pollution
4b)
i)green plants make use of the food they manufacture to produce seed and fruits
ii)dead an decayed plants and animals provide food for the saprophytic organisms
iii)seed produced by plants is used to reproduce another plant
iv)animals make use of the carbohydrate food produced by plants to get energy and fruit used as food
v)animals and plant produce carbohydrate(Co2) during respiration to enrich the atmosphere with Co2
4c)
spacing 40cm*40cm
but 100cm=1m
40cm/100=0.4m
spacing=0.4m*0.4m
spacing=0.16m
READ: 2017/2018 WAEC GCE Agricultural Science Obj/Theory Answers Now
4di)
i)Hemp
ii)Hoop-vine
iii)Nettles
iv)Ramie
4dii)
i)Tea
ii)Mate
iii)Kola
iv)Kava kava.
5ai)
i)beak
ii)oesophagus
iii)proventriculus
iv)Gizzard
v)Large Intestine
5aii)
i)The beak moistens food with Saliva.
ii)The oesophagus takes the food down to the crop to be stored.
iii)proventriculus mixes the food with acids and digestive enzymes.
iv)Gizzard always contains quantities of hard objects such as gravel or other grit that aids in the disintegration of food
v)Large Intestine is where the last of the water re-absorption occurs.
5b)
i)Lack of proper education of farmers
ii)Poverty does not allow people to join insurance
iii)The difficulty of paying farmers when they are due
iv)In attractiveness of insurance in west Africa
v)They seem to benefit only their stakeholders and not farmers
5c)
i)They are very expensive to operate
ii)They are only available to farmers who are Wealthy enough to own television and radio sets
iii)Farmers may find it difficult to ask questions on matters which they do not understand
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