WAEC 2021 Agricultural Science Answer.
(i) It determines whether or not the soil is well developed
(ii) It takes shorter time in the formation of immature soil
(iii) It also takes a long time for plant to decay and become part of the soil
(i) It provides water for hydrolysis
(ii) It helps to break down some parent rocks to form soil
(iii) It enhances vegetative growth of plants whose roots cause further breakdown
(iii) PARENT MATERIAL
(i) They constitute major materials from which soil is formed
(ii) It determines the chemical composition of the soil formed
(iii) It’s hardness affects the rate of soil formation
(i) Non-uniform of crops
(ii) Most exhaustive crops should be followed by less exhaustive e
(iii) Deep rooted crops should be succeeded by shallow rooted crops
(iv) Leguminous crops should be grown after non-leguminous crops
(i) It serves as cover crops
(ii) It serves as food for livestock
(iii) It is used as green manure
(iv) It helps to prevent erosion
(v) It is used for roofing farmstead
PRUNING OF COCOA TREES:
(i) It optimizes the balance of vegetative and reproductive growth
(ii) It increases the efficacy of fertilization and pest control
(iii) It helps in prevention and treatment of disease.
(iv) It reduces risk of failure from dead or weak branches
PARBOILING OF PADDY RICE:
(i) To increase the total and head yield of the paddy
(ii) To prevent the loss of nutrients during milling
(iii) To salvage wet or damaged paddy
(iv) To prepare the rice according to the requirements of consumers
(i) By use of chemicals such as herbicides
(ii) By weeding
(iii) By cultural practices
(iv) By use of good tillage operation
(vi) Use of resistance varieties
(i) They are used to enhance the beauty of a garden or home.
(ii) They are grown for food. Some chilies are grown as ornamental plants. An example is capsicums.
(iii) Some ornamentals can be used for medicinal purposes.Example of ornamental herbs are rosemary, mexican marigold and lemon grass.
(iv) They absorb carbon dioxide from the air and output oxygen thereby creating cleaner air.
(v) Fallen leaves of ornamental plants makes good mulch and compost.