BIOLOGY [3 marks Question Answer]

Living organisms move from one place to another for many
reasons like :
(a) in search of food.
(b) to find a shelter.
(c) to protect themselves from their enemies.

In many animals, including human beings, excess water along with urea is removed in the form of urine. Carbon dioxide produced during respiration is also a waste product and given out through the lungs. The body gets rid of excess water and salts in the form of sweat through the skin.
Plants throw out waste products, mainly in the form of harmless substances like gums, resins, tannins and latex. They release oxygen, carbon dioxide and water vapour through stomata in the leaves. Solid waste which is stored in leaves and barks of trees is thrown out when plants shed their leaves and bark.

Three unicellular animals are:
(a) Amoeba
(b) Paramecium and
(c) Chlamydomonas.