Life Processes Worksheet-13

Life Processes Worksheet-13


  1. Why do the walls of a trachea not collapse when there is less air in it?


  1. What happens to the carbon dioxide which collects in human tissues?


  1. Write the differences between autotroph and heterotroph.


  1. Explain the mechanism of gaseous exchange between tissues and blood.


  1. How does water availability control the rate of photosynthesis?


  1. Why does chlorophyll appear red in reflected light and green in transmitted light?


  1. Why does leaf appear green?


  1. Why does photosynthesis decrease under very high light intensity?


  1. Distinguish between light reaction and dark reaction.


  1. What is the difference between stroma and grana?


  1. Distinguish between chloroplast and chlorophyll.


  1. What is the significance of photosynthesis?


  1. Why is the inner wall of alimentary canal not digested although the digestive enzyme can digest all the materials that make cells?


  1. What are the functions of stomach?


  1. What are the functions of small intestine?


  1. Distinguish between saprozoic and holozoic nutrition.


  1. Name the different types of teeth and give their functions.


  1. What is the difference between ingestion and egestion?


  1. Where are salivary glands situated in man? What are their functions?


  1. Write any two functions of large intestine in man.


  1. Name any four substances that are absorbed actively from the small intestine.


  1. Name the three activities that take place in internal respiration.


  1. Why have lungs replaced skin for gaseous exchange?


  1. Give two overall chemical equations representing aerobic and anaerobic respiration.


  1. Name two animals having cutaneous respiration. What special features of the skin make cutaneous respiration effective?


  1. What is the function of Adam's apple?


  1. Why do mammals require more extensive respiratory surface?


  1. State the functions of : (i) Diaphragm and    (ii) Alveoli.


  1. Explain with reasons why the alveoli are covered with blood capillaries?


  1. Why is it harmful to respire through mouth than through nasal openings?