Life Processes Worksheet-12

Life Processes Worksheet-12


  1. Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like us?


  1. What are outside raw materials used for by an organism?


  1. What processes would you consider essential for maintaining life?


  1. Where does the plant get each of raw materials for photosynthesis?


  1. What is the role of the acid in our stomach?


  1. Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?


  1. How are water and minerals transported in plants?


  1. How is food transported in plants?


  1. What would be the consequences of a deficiency of haemoglobin in our bodies?


  1. Describe the mechanism of blood clotting.


State the two vital functions of the human kidney. Name the procedure used in the working of artificial kidney.


  1. Point out differences between an artery and a vein.


  1. Write any two points of difference between respiration in plants and respiration in animals.


  1. Name any two autotrophic plants which also show heterotrophic mode of nutrition. Why do they need to do so?


  1. Amylase is secreted by two different glands. Name them. What is the action of amylase on food?


  1. What is the role of HCl in protein digestion?


  1. Bring out the differences between internal respiration and external respiration.


  1. Draw a labelled diagram to show the human duodenum and the duct system of the associated digestive glands pouring into it.


  1. Name the passage in sequence through which urine passes from kidneys to the outside in humans. How is urine prevented from flowing back into the ureters?


  1. Why is sino-atrial node also called pace maker?


  1. How is the digested fat absorbed in the body?


  1. Bile juice does not contain any digestive enzymes, yet it is essential for digestion, why so? Explain.


  1. What is a cardiac cycle?


  1. Name two proteases in pancreatic juice. What are their specific roles?


  1. How would digestion of food be affected if the bile duct is completely blocked? Explain.


  1. How would non-secretion of hydrochloric acid in our stomach affect food digestion? Explain.


  1. How would non-secretion of saliva affect digestion of food in our mouth?


  1. How would it affect the digestion of proteins and carbohydrates in the duodenum of man if there is a blockade in the pancreatic duct? Explain.


  1. Give two protein digesting enzymes of pancreatic juice with their action.


  1. Define nutrition. What are the different modes of nutrition?


  1. State the function of epiglottis.