The best and easy method of control of crop pests is by

A. crop rotation

B. chemicals

C. quarantine

D. biological control

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  1. Gases of Jupiter' are
  2. Human blood is oxygenated and purified in the
  3. The energy for the sperm to swim and reach the egg is provided by
  4. Insulin is produced in the human body by the
  5. The diseases that are caused by lack of vitamins are called
  6. The protein synthesis takes place in
  7. The blood of cockroach shows the following characteristics except one. Mark it.
  8. The science dealing with diseases of plants is called
  9. The method of inducing artificial immunity was discovered by
  10. Maize is attacked by
  11. The insects do not have blood pigments because
  12. Fishes send out their nitrogenous waste as
  13. Which among the following is a Cast growing tree?
  14. Insulin is concerned with the metabolism of
  15. The enzyme that is necessary to bring about clotting of blood is
  16. Oxygen transportation in human body takes place through1) Blood2) Lungs3) TissueThe correct sequence…
  17. Scrub jungle Is characterised by
  18. Organisms that depend only on raw plant products are said to be
  19. In case of a heart attack a hormone is injected as an emergency measure. Which one is it?
  20. The golden age of Dinosaurs was
  21. Which of the following diseases is caused by the deficiency of iron in human body?
  22. The life cycle of Malarial Parasite consists of two phases in man. Where do they occur?
  23. The gestation period for the elephant is
  24. A few infections like sore throat, whooping cough and tuberculosis are carried through the respiratory…
  25. The layer of stagnant water in which light penetrates is called
  26. Typhoid is a disease caused by
  27. Prions are composed largely of
  28. The Green Revolution in India owes much to
  29. Vitamins A and C are predominantly present in
  30. pH of blood remains constant due to