To solve this problem, we need to identify the incorrect statement regarding acquired immunity. Let's analyze each option:$\newline \bullet$Option 1: Primary response is produced when our body encounters a pathogen for the first time.$\newline$ - This statement is correct. The primary immune response occurs when the immune system encounters a pathogen for the first time, leading to the activation of immune cells and production of antibodies.$\newline \bullet$Option 2: Anamnestic response is elicited on subsequent encounters with the same pathogen.$\newline$ - This statement is correct. The anamnestic response, also known as the secondary immune response, is a rapid and more robust response due to memory cells formed during the primary response.$\newline \bullet$Option 3: Anamnestic response is due to memory of first encounter.$\newline$ - This statement is correct. The anamnestic response is indeed due to the memory cells that remember the first encounter with the pathogen, allowing for a quicker and stronger response upon re-exposure.$\newline \bullet$Option 4: Acquired immunity is a non-specific type of defense present at the time of birth.$\newline$ - This statement is incorrect. Acquired immunity is specific and develops after exposure to antigens. It is not present at birth; instead, it is developed over time as the immune system encounters various pathogens.$\newline$Therefore, the incorrect statement is Option 4.