8th class Science Chapter 1 online mcq test with answers for chapter 1

Top Scorers Of Chapter 1 "General Science 8th Class English Medium Chapter 1 Online Test" MCQ`s Test

Sr.#	Question	Answer
1	During the combustion of fossil fuel. Which gas is ener the atmosphere.	A. Nitrogen B. Oxygen C. Carbon di oxide D. Hydrogen
2	Half of the increase in atmospheric carbon dioxide concentrations in the last.............. years has occured since 1980	A. 100 B. 200 C. 300 D. 400
3	During respiration by the animals, whihc gas is released into the atmosphere.	A. Nitrogen B. Oxygen C. Carbon Di oxide D. Hydrogen
4	Which is the solution of environmental problems.	A. Reducing pollution B. Plantation C. Protection of endangered D. All these
5	------------- through the food chain is one of the most important functionsof an ecosystem in maintaining balance of nature.	A. Waisting of energy B. Destroy fo energy C. Transfer of energy D. Produce of energy
6	A symbiotic relationship in whihc both speciesl get benefit is called.	A. Commensalism B. Hebitate C. Mutualism D. Symbiosis
7	A relationship where two species live together closely is called	A. Symbiosis B. Predation C. Competitor D. None of these
8	Green house gases is	A. Carbon di oxide B. Methane C. Oxides of nitrogen D. All these
9	Th graphical epresentation of tropihic relationship oforaganisms in an ecosystem is called.	A. Food Chian B. Ecological pyramid C. Trophic level D. Predation
10	A food chain starts from the..........	A. Primary carnivores B. Herbivores C. Producers D. Top carnivores