What role does Helper T-cells and Killer T-cells play?

What role does the molecular interaction play in solution of alcohol and water?

What are sieve cells?

What role does WBC play in immune system?

What does cell membrane do?

Match the terms given in list I with their description in list II and select the correct option from the codes given below. {:("List I", "List II"), ("Helper T-cells", 1. "Cells that are active in production of antibodies"),("Plasma cells", 2. "Activate T or B-lymphocytes to become plasma cells"),("Killer T-cells", 3. "Protein produced by virus infected cell"),("Interferon", 4. "Combine with antigen causing lysis and release of cytokins"):}

What essential role does the root endodermis play during mineral absorption in plants?

What role does root pressure play in water movement in plants?

Name the two types of T-cells.

What role does the following organs play in our body (a) Mammae in male (b) Wisdom teeth (c) Human appendix.