(i) It transports the digested food from the small intestine to the other parts of the body.
(ii) It carries oxygen from the lungs to the other parts of the body.
(iii) Blood helps in removal of carbon dioxide and wastes from the cells.

Evaporation of water through stomata present on the leaves is called transpiration. 
Significance :
(i) It keeps the plant cool.
(ii) It helps in upward movement of water in xylem as it creates a suction force.

Plants absorb water and minerals by the roots. The roots have root hair. These are in contact with the water present between the soil particles. Once the water and minerals reach the xylem tissue of root. Xylem forms a continuous channel that connects roots to the leaves through the stem and branches. The xylem transports water and minerals upwards due to transpirational pull created by the process of transpiration.

The three types of blood cells present in blood are :
(i) RBC (Red Blood Cells)-They contain a pigment haemoglobin which binds with oxygen and helps in the transport of oxygen.
(ii) WBC(White Blood Cells)-They help body to fight against germs. Hence, also called soldiers of body.
(iii) Platelets-They help in clotting of blood.

In human, the heart has four chambers. The two upper chambers are called the atria and the two lower chambers are called the ventricles. The partition between the chambers helps to avoid mixing up of blood rich in oxygen with the blood rich in carbon dioxide.

The artery which carries deoxygenated blood or blood rich in CO₂ is pulmonary artery while the pulmonary vein is; one which carries oxygenated blood. The pulmonary artery carries deoxygenated blood from heart to lungs while pulmonary vein carries oxygenated blood from lungs to heart.

Plants absorb a large quantity of water from the soil because they need nutrients which are dissolved in the water. The excess water evaporates through the stomata present on the leaf surface by the process of transpiration.

The various parts of human excretory system are as follows

The human heart is divided into four chambers, i.e. upper two atrium and lower two ventricles. The functions of these chambers can be tabulated as follows

 The differences between transpiration and translocation are

The main function of the following organs are as follows:
(a) Blood vessels These run between the heart and the rest of the body. It helps in the transport of blood between heart and various organs of the body.
(b) Kidney It is called as the 'magic filters'. It helps in the removal of unwanted substances like urea from the blood.
(c) Blood platelets This component of blood helps in blood clotting and prevents the blood loss from the body.
(d) Heart It is a pumping organ which receives blood from the body through veins and pumps it with enough force into the arteries from where it is carried to the various body parts.

The rhythmic contraction and relaxation of the muscles of the heart is called heartbeat.
Whereas, the rhythmical throbbing of the arteries as the blood is pushed forward through them is called pulse. It can be felt in the wrist, temples, etc. Pulse rate is the number of heartbeats per minutes.
The number of heart beat is equal to the number of pulse per minute.
Therefore, if a pulse rate of an athlete is 96/min then the number of his heartbeat at the same time will also be 96/min.

(a) The only artery that carries carbon dioxide rich blood is pulmonary artery.
(b) The main function of artery is to carry blood away from heart. Also, arteries have thick wall and do not contain valves in them. Blood flow in arteries takes place at high pressure. All these characteristics are found in pulmonary artery. It carries deoxygenated blood from heart to lungs for oxygenation, therefore it is called artery.

The tissue which carries
(a) water and minerals from roots to leaves is xylem.
(b) food from the leaves to the other parts of the plant is phloem.