Explanation:
(a) Full meaning of acronyms of non-governmental agricultural organizations

WARDA - West African Rice Development Agency/Association
IITA - International Institute for Tropical Agriculture
FAO - Food and Agriculture Organization
ILCA - International Livestock Centre for Africa


(b) Ways in which Agriculture is of benefit to rural communities

Provision of food
Provision of medicinal herbs
Creation of market for local/industrial goods
Provision of materials for shelter
Provision of employment
Provision of means of transportation/beast of burden/work animal
Provision of income/revenue for farmers
Provision of raw materials for cottage industries


(c) Liming materials used in Agriculture

Quick lime (CaO) - Calcite (CaCO3)
Limestone (CaCO3) - Chalk (CaCO3)
Slaked lime (Ca(OH)2) - Dolomite (CaMg(CO3)2)
Calcium bicarbonate (Ca(HCO3)2) - Gypsum CaSO4.2H2O
Basic slag Ca(OHSiO3)2 - Wood ash Ca(PO4)2SiO4
Bone meal/calcium phosphate (CaPO4)

(d) Examples of sedimentary rocks

Peat
Conglomerate
Lignite
Common salt
Gypsum
Dolomite
Limestone
Flint
Coal
Sandstone
Breccia
Clay
Shale
Mudstone
Chalk