21- In which type of system goods are exchanged without the use of money?
(A) Barter system
(B) Tithe system
(C) Exchange system
(D) None of the above
22- Which is not a natural ecosystem?
(A) Forest
(B) Aquarium
(C) Land
(D) Soil
23- Which is not a component of Human environment?
(A) Mountain
(B) Religion
(C) Land
(D) None of the above
24- Which of the following is a threat to environment?
(A) Growing Plants
(B) Growing Demands
(C) Growing Buildings
(D) Growing Population
25- ………………..is a blanket of air that surrounds the earth.
(A) Biomes
(B) Biosphere
(C) Lithosphere
(D) Atmosphere
26- …………….is domain of water.
(A) Hydrosphere
(B) Seas
(C) Ocean
(D) Rainfall
27- Relationship between the organism and their surroundings what is it?
(A) Atmosphere
(B) Environment
(C) Biosphere
(D) Lithosphere
ANSWERS:
21-(A), 22-(B), 23-(C), 24-(D), 25-(D), 26-(A), 27-(B)