This is the correct option. Lung is used for excretion of carbon dioxide and water vapour produced during respiration. Skin is used for excretion of urea, salt and excess water by means of sweat glands. Liver is used for removal of excess sugar by converting it into glycogen for further use.

This is the correct option as this statement is false. The water required for preparing food by the plants is absorbed from the soil through the root system.

This is the correct option. Xylem and phloem comprise the conducting tissues. These are special tubes through which, the transport of materials take place. They are present in all parts of the plant's body.

This is the correct option. The movement of water and minerals, absorbed by the root system, takes place from the roots upwards to other plant parts. This movement takes place through the stem and its branches.

This is the correct option as this is not a function of the human circulatory system. It regulates the blood temperature.

This is the correct option. The circulatory system in the human body does not consists of the kidneys. They are a part of the excretory system.

This is the correct option as this statement is false. The root hair increases the surface area of the roots for absorbing water and minerals dissolved in water.

This is the correct option. The doctor will feel the pulse at the wrist. At other places, the arteries are lying deep in the tissues.

This is the correct option. RBCs contains a pigment called haemoglobin, that is a carrier of oxygen.

This is the correct option. WBCs play an important role in the body as they destroy the germs and help fighting infection.

This is the correct option as this is not an example of white blood cells. Erythrocytes are an example of red blood cells.

This is the correct option. In a human body, the pure oxygenated blood is carried by the pulmonary vein to the left auricle.

This is the correct option. The blood of a cockroach is colourless.

This is the correct option. Stethoscope is used by a doctor to measure the heartbeat.

This is the correct option. Oxygen is not a waste product and it is not produced by the body.

This is the correct option. Anus is not an organ of the human excretory system.

This is the correct option. Chlamydomonas, a unicellular organism, and Spirogyra, a simple multicellular plant, use the process of diffusion for the transportation of materials.

This is the correct option. The process of transpiration occurs in plants through stomata by the process of diffusion.

This is the correct option. In amoeba and hydra, most of the metabolic wastes are removed through the general surface of the body.

This is the correct option. In earthworms, the organ for excretion is nephridia. In cockroach, the organs for excretion are malpighian tubules. In cats, the organ for excretion is kidney.