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Human blood is oxygenated and purified in the

A. heart

B. lungs

C. liver

D. kidneys

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  1. Spiders can take only
  2. Which one of the following is essential for blood clotting?
  3. The rate of growth of plants can be measured by a/an
  4. The blood clotting requires the vitamin
  5. The latest drug for cancer is obtained from
  6. The principal reason why it is better to have two eyes than one is that
  7. Chemical substances that called have effect on growth of plants are called
  8. The juice from the leaves of ________ is used for the treatment of diarrhoea, cholera and dysentery.
  9. Which among the following vitamins is considered to be a harmone?
  10. In phototropism, auxins
  11. Typhoid is a disease caused by
  12. One of the sequences given below represents a complete metamorphosis. Which one is it?
  13. Spontaneous generation signifying the development of living organisms from non-living has been termed
  14. Appearance of offspring resembling their remote ancestor is called
  15. Late Blight' is a disease that affects the _______ crop.
  16. Vestigeal organs are those which are
  17. Leaves Call off branches In the winter because of
  18. What is an antigen?
  19. The two German scientists who proposed the 'cell theory' were
  20. The protoplasm of a child is exactly the same as that of its
  21. The cavities of the brain are filled with
  22. Which one of the following is both an exocrine and an endocrine gland?
  23. The bile contains the pigments
  24. Metastasis' is the process by which
  25. Life begets life' or biogenesis was stated by
  26. Plants growing in sunlight are called
  27. The following disease is prevented by triple-antigen immunization
  28. Scurvy is a disease caused by the deficiency of vitamin.
  29. The genetic code DNA is carried from the nucleus to Ribosome by
  30. Adaptation for flying is termed as