This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.

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1) Newly hatched chicks should be vaccinated against The correct option is A. A. Marek's disease Marek's disease is a highly contagious viral disease in poultry, and vaccination is commonly administered to chicks at one day old to provide early protection.
2) Sexual maturity in farm animals could be influenced by The correct option is D. D. I, II and III All three factors—body weight, breed of animal, and nutrition—significantly influence the onset of sexual maturity in farm animals.
3) A major advantage of inbreeding in farm animals is that it The correct option is C. C. maintains desirable traits. Inbreeding increases homozygosity, which helps to fix and maintain specific desirable genetic traits within a population, leading to more uniform offspring.
4) The number of teats in sows is usually The correct option is C. C. 12 - 14. Sows typically have a large number of teats, commonly ranging from 10 to 16, with 12-14 being a desirable and common number to support large litters.
12) Digestion of feed starts in the part labelled The correct option is B. B. II In the avian digestive system, part II represents the proventriculus, which is the glandular stomach where chemical digestion begins with the secretion of digestive enzymes and hydrochloric acid.
13) Digestive juices are secreted in the part labelled The correct option is B. B. II Part II, the proventriculus, is responsible for secreting gastric digestive juices, including hydrochloric acid and pepsin, which initiate protein digestion.
14) A suitable semen extender is The correct option is C. C. egg yolk. Egg yolk is a common and effective component of semen extenders, providing nutrients and cryoprotective properties that help maintain sperm viability during storage and freezing for artificial insemination.
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1) Newly hatched chicks should be vaccinated against The correct option is A. A.
This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.