Question

Compared to a bull, a bullock is docile due to
(a) High Cortisone level
(b) High thyroxine
(c) Low blood testosterone
(d) Low adrenaline/noradrenaline in blood.

Answer 1

Hint: Male sex hormone is responsible for the bulky growth of the body, secondary sexual characters, and the aggression in the animals. Fewer amounts of this hormone will make the animal easy to control and less aggressive.
Complete answer:
Testes are responsible for the production of the male sex hormone testosterone. A bullock is a castrated bull. Castration is the process of removal of testes, resulting in sterility, a decrease in aggression, and secondary sexual characters making the animals docile and meek.
Hence, the correct anwer is (d) Low adrenaline/noradrenaline in blood.

Additional Information
Bullock is also called as draught animals or working animals, which means the animals which are used in agriculture also in transport. They are of great importance to the farmers they are extensively used to plow fields and pull carts for the transport. Other draught animals include horses, elephants. They may also be used as a mode of transportation of goods. Animals like ponies and donkeys are sometimes used for pulling carts. Dogs are used as guide dogs in many instances.

Note: The process of castration is performed intentionally for improving the quality of meat, decreasing the aggressiveness of the farmed animals and pet animals, and to reduce the population by making the animal sterile.