Which type of immunity is slow and takes time to give its full effective response?

Active immunity

The correct option is 2. Active immunity

Active immunity is a type of immunity that is acquired when the host is exposed to antigens, such as through immunization or natural infection. It involves the activation of the immune system and the production of specific antibodies and memory cells. However, the development of an effective immune response in active immunity takes time. It requires the recognition of antigens, activation and proliferation of lymphocytes, and the production of a sufficient number of antibodies to combat the infection.

In contrast, passive immunity refers to the transfer of preformed antibodies from one individual to another, providing immediate but temporary protection. Passive immunity does not involve the activation of the individual's immune system and does not result in the long-term memory response observed in active immunity.

Innate immunity, on the other hand, is the non-specific defense mechanism that is present from birth and provides immediate protection against a wide range of pathogens. It is not dependent on prior exposure or specific recognition of antigens.