Question 1 ( 1.0 marks) How many moles of oxygen are present if there are N o oxygen molecules? Solution: Question 2 ( 1.0 marks) Name any two kingdoms having multicellular organisms with cell wall. Solution: Fungi and plants are the two kingdoms having multicellular organisms with cell wall. Question 3 ( 1.0 marks) A particular kingdom X has organisms with cell wall, but a non-definite nucleus. Identify the kingdom X . Solution: Kingdom Monera has organisms with cell wall, but a non-definite nucleus. Question 4 ( 1.0 marks) In lifting an object, gravitational force is said to have done negative work. Why is it so? Solution: The work done in this case is negative because the displacement of the object is directed opposite to the line of action of gravitational force. Question 5 ( 1.0 marks) How is a mechanical wave carried forward in a medium if there is no forward motion of the particles of the medium? S