Four similarity between blood and lymph....

Blood is a red coloured liquid which circulates in our body. It is red because it contains a pigment called haemoglobin in its red cells.
 

The main components of blood are:

(i) Plasma: It carries all the dissolved substances such as proteins, digested food, common salt etc from one part to another part of the body.

(ii) Red blood corpuscles (RBC): It carries oxygen from the lungs to all the cells of the body.

(iii) White blood corpuscles (WBC): It fights infection and protects us from diseases.

(iv) Platelets: It helps in the coagulation of blood in a cut or wound.

Functions of blood:
(i) It carries oxygen from the lungs to different parts of the body.
(ii) It carries carbon dioxide from the body cells to the lungs for breathing out.
(iii) It carries digested food from the small intestine to all the parts of the body.
(iv) It carries waste product called urea from the liver to the kidneys for excretion in the form of urine.
(v) It protects the body from diseases.

Lymph is a light yellow liquid. It is a medium of circulation in human body which flows only in one direction - from body tissues to the heart. The functions of lymph are:

(i) It takes part in the nutritive process of the body.

(ii) It protects the body by killing the germs drained out of the body tissues with the help of lymphocytes contained in the lymph nodes, by making antibodies.

(iii) It helps in removing the waste products like fragments of dead cells etc.