Reason: Oysters are cultivated for the pearls they make. Oysters have long been valued for the precious pearls that develop in them. Some oysters are also eaten as food. But shell and teeth are not useful in them. 

Reason: Leghorn is an exotic or foreign poultry breed.

Reason: Mussels and oysters thrive in marine (in sea) water habitat. Inland fisheries include freshwater resources like canals, ponds, reservoirs and rivers. 

 Reason: Broilers are raised for the production of meat. Poultry farming is undertaken to raise domestic fowl for egg production and chicken meat. Therefore, improved poultry breeds are developed and farmed to produce layers (hens that lay eggs) for eggs and broilers for meat. Care is taken to avoid mortality and to maintain feathering and carcass quality.

Reason: Aseel is an indigenous poultry breed. Indigenous means local breed or of native land. Aseel is Indian breed while foreign or exotic breed of poultry is Leghorn.

Reason: In poultry shelters, there should be proper cleaning, sanitation and spraying of disinfectants at regular intervals. Thus, accumulation of excreta is not the requirement of poultry shelter as it may increase the risk of occurrence of many viral, bacterial and fungal diseases among the fowl. Adequate lighting and proper ventilation are also required in poultry shelters so that the chickens have proper light to see by and to find feed and water. Light periods are accompanied by dark periods each day to allow them to take proper rest. 

Reason: The practice of culturing marine fish stock is known as mariculture.

Reason: Peneaus monodon is a type of marine (in sea) prawn.

Maintenance requirement which is the food required to support the animal to live a healthy life. (b) Milk producing requirement which is the type of food required during the lactation period. Lactation period describes the secretion of milk and the process of providing it to the young ones. 

Reason: A high maintenance requirement is not a desired trait for raising new variety of poultry breeds.

Reason: Marine fisheries include deep seas and coastline. In India, it includes 7500 km coastline and the deep seas beyond it. Popular marine fish varieties include pomphret, tuna and sardine, while freshwater fishes inhabit rivers and lakes. For example, catla is a freshwater fish.

Reason: Estuaries and lagoons are types of brackish water resources.

Reason: The practice of growing four to five fish species in a single fish pond is known as composite fish culture. In such systems, these species are selected so that there does not exist any competition for food among them having different types of food habits. E.g. catlas are surface feeders, rohus feed in the middle zone of the pond, mrigals and common carps are bottom feeders and grass carps feed on the weeds. These species when together, can use all the food in the pond without competing with one another. This increases the fish yield from the pond.

Reason: Concentrates are the foods which are low in fibre and contain high levels of proteins and other nutrients like carbohydrates and minerals.

Thus, option (A) is correct. 

Reason: Roughage includes fibrous food.

Reason: The practice of growing four to five fish species in a single fish pond is known as composite fish culture. In such systems, these species are selected so that there does not exist any competition for food among them as they possess different types of food habits. E.g. catlas are surface feeders, rohus feed in the middle zone of the pond, mrigals and common carps are bottom feeders and grass carps feed on the weeds. These species when together can use all the food in the pond without competing with one another. This increases the fish yield from the pond. Thus option (C) and (D) are incorrect as both are advantages of composite fish culture.

Reason: Additive feed of cattle includes micronutrients which promote the health and milk output of dairy animals.

Reason: Catlas serve as surface feeders in a composite fish culture. 

 Reason: The practice of growing four to five fish species in a single fish pond is known as composite fish culture. In such systems, these species are selected so that there does not exist any competition for food among them having different types of food habits. E.g. catlas are surface feeders, rohus feed in the middle zone of the pond, mrigals and common carps are bottom feeders and grass carps feed on the weeds. These species when together can use all the food in the pond without competing with one another. This increases the fish yield from the pond. One problem with such composite fish culture is that many of these fish breed only during monsoon. Even if fish seed is collected from the wild, it can be mixed with that of other species as well. So, a major problem in fish farming is the lack of availability of good quality seed. To overcome this problem, ways have been worked out to breed these fish in ponds using hormonal stimulation. This has ensured the supply of pure fish seed in desired quantities. Change in food habits will not work as already the fishes selected for composite farming have different food habits. Therefore, improving their feed will also not help in getting pure fish seed.