Correct Answer: D. pullet

Correct Answer: C. udder enlargement

Correct Answer: D) all the above

Explanation

The question is asking why absorption is highest in the small intestine. The small intestine is an important part of our digestive system where most of the nutrients from the food we eat are absorbed into our bloodstream. The options given are: A) the presence of villi, B) its length, C) its thin walls, or D) all of the above. Option A states that the presence of villi is responsible for maximum absorption in the small intestine. Villi are tiny finger-like projections that protrude from the surface of the small intestine. These villi increase the surface area of the small intestine, which means there are more places for nutrients to be absorbed into the bloodstream. Therefore, Option A is correct. Option B suggests that the length of the small intestine is responsible for maximum absorption. However, the length of the small intestine is not a significant factor in absorption. The small intestine is actually quite long, but it is the surface area that is important for absorption, not the length. Therefore, Option B is incorrect. Option C states that the thin walls of the small intestine are responsible for maximum absorption. The walls of the small intestine are indeed thin, but this is not the main reason for maximum absorption. Instead, the presence of villi and microvilli on the surface of the small intestine are responsible for the majority of nutrient absorption. Therefore, Option C is also incorrect. Option D is the correct answer, as the presence of villi, the length, and the thin walls of the small intestine all contribute to maximum absorption. The villi increase the surface area, the length provides more time for absorption to occur, and the thin walls allow for the efficient transfer of nutrients into the bloodstream. In conclusion, the correct answer to the question is Option D, which states that all of the options listed contribute to maximum absorption in the small intestine.

Correct Answer: D. serving as main source of foriegn exchange

Explanation

2(a) Farm operations requiring electric power are: (i) Refrigeration. (ii) Incubation. (iii) Milking ( machines) (iv) Drying of produce or material. (v) Shelling of fruits/ seeds. (vi) Feed making / grinding / mixing. (vii) Any processing operation e.g parboilling, threshing, winnowing e.t.c. (viii) Defeathering / plucking. (ix) Debeaking. (x) Candling. (xi) egg or grading.

(b) Advantages and disadvantages of (i) electricity: Advantages: (1) Neat (2) Fast operation increased production. (3) Very dependable (4) Easy to operate. (5) Versatile. (6) Efficient and saves energy and reduces cost of production too.

Disadvantages: (1) Very expensive (2) Dangerous to life (3) Supply may be irregular - (4) It Can cause fire hazard. (5) Cannot be widely used in field operations.

(ii) Animals: Advantages: (1) Cheap to maintain (2) Cheap to purchase. (3) Easy to operate. (4) Can operate in rugged terrains. (5) Can be used in evacuation of produce from inaccessible areas. (6) They are more efficient than man. (7) Removes drudgery and makes work easier.

Disadvantages: (1) They require human guidance. (2) Power output is very low. (3) Capacity is limited and may refuse to work. (4) Prone to infection by disease. (5) Limited to some types of operations.

Correct Answer: A. sprinklers

Correct Answer: B. sandy loam

Correct Answer: D. loam

Correct Answer: A. moisture content

Explanation

(a) The economic importance of insect pests in crop production are: (i) They destroy crops on the field through their sucking, burrowing and defoliation activities. (ii) They reduce the yield and in some cases attack may lead to total crop failure. (iii) They reduce the nutritional value of crops either on the field or in store. (iv) Farmers' profits are drastically reduced. (v) Cost of production is increased as large sum of money is expended on their control. (vi) They render ' vegetables and fruits unattractive and unmarketable. (vii) They reduce viability of stored seeds. (viii) They serve as , vectors of diseases. (ix) Some are agents of pollination. (x) The wounds they create while feeding on plants predispose plants to infection.

(b) Hosts of cotton stainer are: (i) kenaf (ii) Okra (iii) silk cotton tree

(c) Soil-living insect pest of crops include: (rickets and termites. Control measures of insect pest of crops are: i) use of resistant or tolerant varieties, (ii) crop rotation practices, (iii) spraying crops with insecticides. (iv) dusting seeds or planting materials with powdered insecticides e.g. aldrin dust (seed treatment), (v) tillage practices. (vi) timely planting of crops; (vii) timely harvesting, (viii) farm hygiene / sanitation.