The aphotic zone means that light is

A. always present

B. present during day

C. always absent

D. present during night

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. The 'mad-cow disease' (Jakob-Creutzfeldt disease) is produced by certain
  2. The protein synthesis takes place in
  3. Haemophilia is a hereditary disease carried by
  4. Which of the following diseases is not caused by a virus?
  5. Tuberculosis is caused by
  6. The theory that cells arise from the pre-existing cells was proposed by
  7. The olfactory area is concerned with
  8. What are halophytes?
  9. The normal temperature of human body on the Kelvin scale is
  10. Man is warm-blooded, frog is cold-blooded, Which one of the following is cold-blooded?
  11. Vitamin D is manufactured in a healthy human being by the action of _______ on the skin and absorbed…
  12. A few infections like sore throat, whooping cough and tuberculosis are carried through the respiratory…
  13. Higher plants take up nitrogen as
  14. The hormone that is responsible for secondary sexual character in the male is
  15. Desert plants are called
  16. Insulin is concerned with the metabolism of
  17. The grouping of blood is based on substances called
  18. The bile contains the pigments
  19. Herbivores are
  20. The function of ribosomes is
  21. The rate of heartbeat is accelerated by the hormone
  22. Lymphocytes are manufactured by
  23. Colour vision is made possible by the cells in the retina called
  24. Fledgling is a term often used to denote the young one of a
  25. The condition in which there is abnormal decrease of white blood corpuscles is known as
  26. Measles is caused by
  27. Two tall plants, each being a hybrid and carrying a recessive factor for dwarfness are crossed. What…
  28. In a gamete there will be
  29. Injection of insulin causes
  30. Which of the following organelles is known as the 'power House' of the cell?