E. Short answer type questions
1. Why is transport of materials necessary in an animal?
2. What will happen if there are no platelets in the blood?
3. What are stomata? Give two functions of stomata.
4. What are the components of blood?
5. Why is it necessary to excrete waste products?
Answers
Answer:
1. Transport of materials is necessary for plants or animals because due to it the nutrients and oxygen are made available to all the parts of the body. If the transport of necessary nutrients and oxygen does not take place in the body, the body will not be able to survive.
2.Platelets, also known as thrombocytes perform primarily the function of clotting of bloods. If there are no platelets in the blood, a coagulum or a clot will not form and hence, this will result in unstoppable bleeding leading to severe blood loss and ultimately death of the individual.
3.Stomata are tiny pores or opening on the surface of a leaf. Functions of stomata: (i) Evaporation of water in plants in the form of vapour takes place through stomata during transpiration. (ii) Exchange of gases (oxygen and carbon dioxide) also takes place through stomata.
4.Blood is a specialized body fluid. It has four main components: plasma, red blood cells, white blood cells, and platelets. Blood has many different functions, including: transporting oxygen and nutrients to the lungs and tissues.
5.The waste materials produced during the metabolic activities are toxic to the body and must not be accumulated inside and therefore it has to be excreted out from the body by the process of excretion.