The antigens present on the surface of RBC has a prominent role in detecting blood group.  Substantiate this statement.

Analyse the hints related to defence mechanism in plants given below .

Explain the hints writing two examples each

a) Different molecules produced by body tissues.

b)Characteristic features of the body structure.‍

A blood group without antigens is used in blood transfusion in some instances. Name the blood group?

Name the lymphocytes which stimulates other white blood cells and destroys pathogens. Write two other functions of it.

Identify the statements related to the chemical callose

a)The germs that have crossed the cell wall are prevented

b) Provides rigidity to cell wall.

c) Prevents the entrymof pathogens through the surface of leaf

Identify the relationship between the words and fill in the blanks

a)Antibiotic : Alexander flemming

b) Vaccination : .......................................

Analyse the hints given below and identify the treatment methods.

a) Use of medicines from nature

b) Use of antibiotics

Name the secretions which destroy pathogens which are present in each the parts given below

a) Skin

b) Tear

c) Stomach

Explain the role of the factors which are given below in defending diseases.

a.Lysosome

b.lysozyme

Antigen D has a critical role in blood transfusion

Evaluate this statement considering a A +ve donor and a A --ve recipient

There are different methods in plants to prevent the entry of germs.

Justify the statement giving two evidences related to cell wall.

Substantiate the below given statements giving one suitable example to each

A- "Body has natural defence mechanisms to defend pathogens”

B- "There are artificial methods also to defend pathogens"