State whether the following statements are True or False:Income due but not received is a liability.
State whether the following statement is true or false.
All quadrilaterals are polygons, but all polygons need not be quadrilaterals.
State whether the following statements are true or false. If false, correct them.
(a) Plants consume oxygen for respiration.
(b) Plants produce oxygen during the process of making their own food.
(c) Air helps in the movements of sailing yachts and gliders but plays no role in the flight of birds and aeroplanes.
(d) Air does not occupy any space.