Question

White precipitate is formed when Sodium sulphate reacts with Barium chloride. It is an example of *

a Double Displacement reaction.
b Decomposition reaction.
c Displacement reaction
d Combination reaction.

7. If Saliva does not contain enzyme salivary amylase, which change in the food does not occur *

a Proteins will not be converted to amino acids
b Fats cannot be broken down into smaller globules.
c Starch cannot be converted to sugars
d Vitamins cannot be absorbed.


8. Choose the correct path of air in Human Respiratory System *

a Nostril Trachea - Alveoli- Pharynx
b Nostrils  Trachea  Pharynx  Alveoli
c Nostrils  Bronchus Trachea  Air sacs
d Nostrils Trachea Bronchus  Alveoli

9. Double circulation of Blood is essential in *
a Mammals and Amphibians
b Mammals and Birds
c Birds and Pisces
d Birds and Amphibians.​

Answer 1

Answer:

a) double displacement reaction

c) starch cannot be break into sugar

b) nostril=trachea= pharynx=Alveoli

b) birds and mammals

hope my answers help u...