Question

Q3) Give the Reason (Any-2)

1) Tooth paste is used for brushing teeth.

2) Person with blood group "O" is considered as universal donor.

3) Chloroplasts are important for photosynthesis.​

Answer 1

1. used for cleaning the teeth as it can neutralize the excess acid in the mouth and prevent tooth decay.
2. People with type O- blood are called universal donors because their donated red blood cells have no A, B or Rh antigens and can therefore be safely given to people of any blood group.
3. because Chloroplasts are plant cell organelles that convert light energy into relatively stable chemical energy via the photosynthetic process.