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2019 NECO GCE AGRICULTURAL SCIENCE OBJ AND ESSAY ANSWER

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AGRIC-OBJ
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51EAADEDECCC

 

(3ai)
Drainage is a process whereby excess water in the soil is removed artificially to promote good farming activities.

(3aii)
(i) Surface Drainage.
(3aii) Sub-surface Drainage.

(3b)
(i)It maintains soil ability to absorb and retain water.
(ii)It helps control erosion.
(iii)It reduces lost of soil nutrients.
(iv)It helps to the activities of microorganisms

(3c)
(i) Copper:- It is a constituent of certain enzymes.
(ii) Boron:- It increases yield/it facilitates modulation in leguminous plants.
(iii) Zinc:- It involves the action of certain enzymes.

(3d)
(i) Temperature
(ii) Wind
(iii) Water

(i) TEMPERATURE:- The alternating heating and cooling of the rocks produces pressure within the rocks and cause them to break down into pieces

(ii) WIND:- As a result of grinding of rocks surfaces by solid materials carried by wind, and moving ice rocks break down to form soil

(iii) WATER:- Running water carries some fragments of rocks along its course and these rub against the surface of rocks in the river bed, thus breaking off small pieces of rocks.

(3e)
Commensalism, is a relationship between
individuals of two species in which one species obtains food or other benefits from the other without either harming or benefiting the latter while Mutualism is a relationship between organisms of two
different species in which each benefits.
=====================================

(5a)
{TABULATE: PICK 3}

{MONOCOTS}
(i) They has embryo with single cotyledon
(ii) major leaf vein is parallel
(iii) The stem arranges the vascular tissue sporadically
(iv) Roots are adventitious
(v) Flower parts are in multiples of three

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{DICOTS}
(i) Embryo with two cotyledons
(ii) major leaf vein is reticulated
(iii) stem vascular bundles are in a ring
(iv) roots developes from radicle
(v) Flower parts are in multiple of four or five

(5b)
(i) Cola nitida
(ii) Manihot esculenta
(iii) Hevea brasiliensis
(iv) Solanum lycopersicum

(5ci)
{Aphids}
Crop attacked are pumpkin, melon, bean, potato, lettuce, beet, chard

{Economic importance}
(i) Nymph and adult aphids feed on plant juices.
(ii) They attack everywhere on plants, starting from the leaves, the stem, the buds, flowers and eventually the fruit of the crop involved.

{Control}
(i) If you have a large aphid invasion, dust plants with flour. It constipates the pests.
(ii) Try spraying cold water on the leaves

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(5cii)
{Spider mites}
Crop attacked are
strawberries, melons, beans, tomatoes, eggplant

{Economic important}
They cause damage to crop

{Control}
(i) Prune leaves, stems and other infested parts of plants
(ii) Use the Bug Blaster to wash plants with a strong stream of water and reduce pest numbers.

(5ciii)
{Grasshopper}
Crop attacked are plant leaves, tasels etc

{Economic importance}
(i) They cause nutrient cycling by breaking down plants, fertilizing soils with their excreta and in turn facilitating plant growth.
(iii) Preys upon smaller insect pests of plants.

{Control}
(i) physical control measures like handpicking adults and trapping in soapy water
=====================================

(2a)
PICK ANY THREE.
(i)Commercial agriculture increases yield
(ii)Specialization of labour
(iii)Encouragement of research work
(iv)Provision of cheap products
(v)Provision of quality products

(2bi)
(i)improve human welfare and food
supplies in Africa
(ii)Increased livestock production

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(2bii)
(i)conducts research on protecting the environment.
(ii)trapping dryland communities in poverty and hunger and dependent on external aid.

(2c)
PICK ANY THREE.
(i)It helps to know the size or hectarage of a farmstead
(ii)It helps in the arrangement of land for proper usage without
the risk of land degredation.
(iii)Farm surveying help to make proper use of resources available
(iv)For projecting the maximum profit achieved.

(2d)
PICK ANY THREE.
(i)Step-by-step assessment tests covering all areas of
interest
(ii)Detailed solutions and insights
(iii)Timed self-paced exercises testing your knowledge
(iv)Progress reports and analysis

(2e)
(i)The land use act causes delay in land acquisition.
(ii)It also caused difficulty in land acquisition
(iii)This power given to the governors have been abused by
many as lands in their trust are either used as they will, or
withheld from potential developers.
=====================================

(7a)
Allelomorphs; s a variant form of a given gene, meaning it is one of two or more versions of a known mutation at the same place on a chromosome

(7aii)
(i)Specialised equipment is needed
(ii)Technical expertise is needed
(iii)Improper cleaning of instruments and in sanitary conditions may lead to lower fertility

(7b)
(i)wind
(ii)drought
(iii)humidity
(iv)topography
(v)climate type and precipitation

(7c)

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