SCIENCE PUZZLE

123456789101112131415
Across
  1. 1. pH value more than 7
  2. 4. Synthesise their own food
  3. 7. Contains pepsin
  4. 9. Colour of this metal is grey
  5. 10. Thicker at the middle than at the edges.
  6. 12. Concave lens is also called
  7. 13. The odour of SO2 gas is
  8. 14. Inhalation starts from here
  9. 15. bulged inward
Down
  1. 2. The width of a spherical mirror
  2. 3. It is written as Mg3N2
  3. 5. Blood is red due to it
  4. 6. It has 4 chambers
  5. 8. Virtual image smaller than the object is in this mirror
  6. 11. The element or compound which undergoes reduction is
  7. 15. Anaerobic respiration takes place here