Title 15 Our Environment - MCQs.pdf ✅

© www.bankofbiology.com 2 a) 1 st trophic level b) 2 nd trophic level c) 3 rd trophic level d) 4 th trophic level Answer: b) 2 nd trophic level 19. Which of the following statement is correct? a) Small carnivores are secondary consumers belonging to third trophic level. b) Small carnivores are tertiary consumers belonging to third trophic level. c) Small carnivores are secondary consumers belonging to second trophic level. d) Small carnivores are tertiary consumers belonging to fourth trophic level. Answer: a) 20. Autotrophs capture solar energy and convert into a) Mechanical energy b) Potential energy c) Chemical energy d) Kinetic energy Answer: c) Chemical energy 21. Percentage of solar energy captured by green plants in a terrestrial ecosystem is about a) 1% b) 5% c) 10% d) 90% Answer: a) 1% 22. What percentage of the food consumed by consumers becomes part of their bodies? a) 1% b) 5% c) 10% d) 90% Answer: c) 10% 23. The series of branching relationship of food chains is called a a) Trophic level b) Food web c) Pyramid of energy d) Pyramid of mass Answer: b) Food web 24. What will happen if all the deer are killed in the given food chain? Grass → Deer → Lion a) population of grass decreases. b) population of lions increases. c) population of lions remains unchanged. d) population of lions decreases and grass increases. Answer: d) 25. In the given food chain if the amount of energy at the fourth trophic level is 4 kJ, what will be the energy available at the producer level? Grass → Grasshopper → Frog → Snake a) 4 kJ b) 40 kJ c) 400 kJ d) 4000 kJ Answer: d) 4000 kJ 26. The non-degradable chemicals such as pesticides may be get accumulated at each trophic level. This is called a) Biofortification b) Biological magnification c) Biodegradation d) Bioluminescence Answer: b) Biological magnification HOW DO OUR ACTIVITIES AFFECT THE ENVIRONMENT? 27. The depletion of the ozone layer causes a) global wanning b) earthquakes c) increased UV radiations d) acid rain Answer: c) increased UV radiations 28. Select the wrong statement. a) Ozone (O3) is a deadly poison. b) At the higher levels of the atmosphere, ozone shields the earth surface from ultraviolet (UV) radiation from the Sun. c) The major reason for the ozone depletion is Hydrofluorocarbons (HFCs) used as refrigerants. d) Chlorofluorocarbons (CFCs), halons etc. can cause ozone depletion. Answer: c) 29. Excessive exposure to ultraviolet radiation causes a) inflammation of liver b) cancer of skin c) damage to the lungs d) jaundice Answer: b) cancer of skin 30. At higher levels of the atmosphere, UV radiation splits O2 molecules into free oxygen atoms. These free oxygen atoms then combine with O2 to form a) Carbon dioxide b) Ozone c) Nitrogen dioxide d) Methane Answer: b) Ozone 31. Which of the following chemicals causes depletion of the ozone layer? a) Carbon tetrachloride b) Methane c) Chlorofluorocarbon d) Carbon monoxide Answer: c) Chlorofluorocarbon 32. Which organization made an agreement to freeze CFC production in 1987? a) United Nations Development Programme (UNDP) b) World Health Organization (WHO) c) United Nations Environment Programme (UNEP) d) International Atomic Energy Agency (IAEA) Answer: c) 33. If we eat coal, we do not get energy from it because a) Coal contains inorganic materials, which the body cannot process. b) Humans do not have specific enzymes needed to breakdown coal.