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What is meant by ''excretion'' ? What ar...

What is meant by ''excretion'' ? What are the various waste materials excreted from the human body? Why is it necessary to excrete waste products?

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LAKHMIR SINGH & MANJIT KAUR-TRANSPORT IN ANIMAL AND PLANTS-EXERCISE
  1. How does the food move from the leaves to all other parts of a plant?

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  2. State the function of circulatory system. Name the various parts of th...

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  3. What is meant by ''excretion'' ? What are the various waste materials ...

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  4. What are the various organs of the human excretory system? Draw a diag...

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  5. Why do plants need a transport system? Name the two types of vessels (...

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  6. Explain how, water moves from the soil particles to the xylem vessels ...

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  7. The cells in our blood which destroy disease-causing germs, are:

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  8. A blood vessel which carries blood back to the heart is :

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  9. The wave of expansion of an artery when blood is forced into it is cal...

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  10. In plants, water is transported through

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  11. Water absorption through roots can be increased by keeping the potted ...

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  12. The component of blood which makes chemicals known as antibodies is :

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  13. If a patient is put on dialysis, he is most likely suffering from a se...

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  14. Blood is pumped from the heart to the entire body by the:

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  15. The blood leaving the tissues becomes richer in

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  16. What prevents backflow of blood inside the heart during contraction?

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  17. Which vein brings clean blood from the lungs into the heart ?

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  18. Which blood vessel does not carry any carbon dioxide ?

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  19. The phloem tissue in plants is responsible for the transport of :

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  20. In which of the following are the largest amount of nitrogen excreted ...

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