Why is it an advantage for the testes to be situated in the scrotal sac outside the main body cavity ? Can you think of one disadvantage ?
The formation of sperm requires a temperature lower than that of the body. Therefore, the testes are situated in the scrotal sac outside the main body cavity providing them a lower temperature.
Their position outside the main body cavity makes the testes prone to injury.
Science for Tenth Class - Part III - Biology