Once infection is sensed, the immune system releases a chemical called-------

sensing the pyrogens, hypothalamus increases the body temperature by releasing a chemica called------.

In the immune system, interferons are a part of

Nylon is a plastic polymer made of chemical units called -------

Animal sense their surroundings by sense organ is called:

The first line of defence in the immune system is provided by

What are the cells involved innate immune system ?

Consider the following steps involved in nodule formation in the root of a legume. (i). Bacteria release chemicals and enzymes. (ii). Bacteria stop dividing and form bacteroides. (iii). Roots secrete chemical atractants. (iv). Formation of infection thread. (v). Formation of nodules. (v). Formation of nodulues. (vi). Division of infected cortical cells. (vii) Curlinig of root hair and degradation of their cell wall. (viii). Infection thread grows along with multiplication of bacteria. Arrange the steps in the right sequence and mark the correct option

Read the following statements and select the correct option. Statement 1 : When the immune system fails to recognise 'sell' from 'nonself' and starts destroying body's own proteins, this leads to auto-immune diseases. Statement 2 : Addison's disease and rheumatoid arthritis are auto-immune diseases.

Humoral immunity system is mediatedby: