Question

which of the following are functions of the pili found in t1 and t2 types of neisseria spp.:
attachment to host tissues
causes damage to host cell tissues
cleaves iga
helps the bacteria resist drying
inhibits phagocytosis
prevents peptidoglycan from being produced in host

Explanation:

Pili in Neisseria spp. (like in T1 and T2 types) are mainly involved in attachment to host tissues (they help bacteria adhere to cells in the host, which is an initial step for infection). Also, pili can inhibit phagocytosis. Phagocytosis is the process by which immune cells (like macrophages) engulf and destroy bacteria. When bacteria have pili, it can make it harder for these immune cells to engulf them.
Causing damage to host cell tissues is more related to toxins (not pili). Cleaving IgA is a function of IgA proteases (not pili). Helping bacteria resist drying is more about the cell envelope or other surface structures (not pili). Preventing peptidoglycan production in the host is not a function of pili (peptidoglycan is part of bacterial cell walls, and its production is regulated within the bacteria).

Answer:

attachment to host tissues, inhibits phagocytosis