Wilkins X-ray diffraction showed the diameter of the DNA helix as

  1. 10A
  2. 20A
  3. 30A
  4. 40A

Potato is a modified form (outgrowth) of:

  1. Root
  2. Stem
  3. Fruit
  4. Leaf

Ordinary table salt is sodium chloride. What is baking soda?

  1. Potassium chloride
  2. Potassium carbonate
  3. Potassium hydroxide
  4. Sodium bicarbonate