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Why is diffusion insufficient to meet th...

Why is diffusion insufficient to meet the oxygen requirements of multicelluar organisms like humans?

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In multicellular organisms , all the cells of body may not be in direct contact with the surrounding source of oxygen i.e. environment , thus simple diffusion will not meet the oxygen requirements of all the cells . These organisms require specialist organs to meet the oxygen requirement.
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(a) Why is diffusion insufficient to meet the oxygen requirements of large multicellular organisms like humans? (b) What type of arrangement exists in the bodies of large animals to meet their oxygen requirements adequately ? (c) What advantage a terrestrial animal has over an quantic animal with regard to obtaining oxygen for respiration?

Case 2 : the biological process involved in the removal of harmful metabolic wastes from the bosy is called excertion .Different organisms use varied strategies to do this Many unicellular organisms remove these wastes by simple diffusion from the body surface into the surrounding water while complex multicellular organisms use specialised organs to perform the same function . Which of the following statements (s) is (are) true about excretion in human beings ? (I) Urine is stored in the urethra until the urge of passing it out . (II) Kidneys are the primary excretory organs . (III) The bladder is muscular so it under nervous control . (IV) Each kidney has large numbers of filtration units called nephrons .

36 ml of a gaseous mixture consisting of a gaseous organic compound A and just sufficient amount of oxygen required for complete combustion gives 16 ml of CO_(2) , 24 ml water vapour and 8 ml of N_(2) . The volumes are measured at same temperature and pressure. Volume of O_(2) required for complete combustion

MBD -HARYANA BOARD-LIFE PROCESSES-SHORT ANSWER TYPE QUESTION
  1. Why is diffusion insufficient to meet the oxygen requirements of multi...

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  2. What criteria do we use to decide whether something is alive?

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

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

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  5. What are the differences between autotrophic nutrition and heterotroph...

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  6. Where do plants get each of the raw materials required for photosynthe...

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  7. Draw diagram of stomata through which exchange of gases take place.

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  8. What is the role of the acid in our stomech?

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  9. What is the function of digestive enzymes?

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  10. How is the small intestine designed to absorb digested food?

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  11. What are the different ways in which glucose is oxidised to provide en...

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  12. How is oxygen and carbon dioxide transported in human beings?

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  13. Explain the process of double circulation with the help of schematic r...

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  14. How are the lungs designed in human beings to maximise the area for ex...

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  15. What are the components of the transport system in human beings? What ...

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  16. How are water and mineral transported in plants?

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  17. Explain the movement of water and minerals in plants.

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  18. How is food transported in plants?

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  19. What is the process of translocation of food in plants.

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  20. Write various events occurring during the process of photosynthesis.

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