Title 15 Our Environment - MCQs.pdf ✅

© www.bankofbiology.com 1 15. OUR ENVIRONMENT - MCQs ECOSYSTEM – WHAT ARE ITS COMPONENTS? 1. The biotic and abiotic factors which surrounds any living organism is called its a) Environment b) Habitat c) Niche d) Biome Answer: a) Environment 2. All the interacting organisms in an area together with the non-living constituents form a) Habitat b) Food web c) Ecosystem d) Food chain Answer: c) Ecosystem 3. Which of the following is an abiotic component of an ecosystem? a) Bacteria b) Humus c) Plants d) Fungi Answer: b) Humus 4. Which one of the following is an artificial ecosystem? a) Lake b) Forest c) Pond d) Crop field Answer: d) Crop field 5. Aquarium is a self-sustaining system because a) It is a human made ecosystem. b) It includes biotic factors and abiotic factors. c) It does not need soil. d) It is protected from alien species invasions. Answer: b) It includes biotic factors and abiotic factors. 6. Which of the following groups come under producers? a) Green plants and some fungi b) Green plants and all fungi c) Green plants and some bacteria d) Green plants and all bacteria Answer: c) Green plants and some bacteria 7. Photosynthesisis a process by which green plants make a) organic compounds from inorganic substances using solar energy in presence of chlorophyll. b) inorganic compounds from organic substances using solar energy in presence of chlorophyll. c) organic compounds from inorganic substances using chemical energy in presence of chlorophyll. d) inorganic compounds from organic substances using chemical energy in presence of chlorophyll. Answer: a) 8. Which one of the following pairs belong to the category of primary consumers? a) Eagle and snake b) Grasshoppers & cattle c) Snake and frog d) Water beetles & fish Answer: b) Grasshoppers & cattle 9. Grasshopper, Rabbits, Deer etc. are the consumers that belong to a) Herbivores b) Carnivores c) Omnivores d) Frugivores Answer: a) Herbivores 10. Human, bears, birds, dogs etc. are a) Herbivores b) Carnivores c) Omnivores d) Frugivores Answer: c) Omnivores 11. Which of the following is not considered as a parasite? a) Roundworms b) Tapeworms c) Leech d) Earthworm Answer: d) Earthworm 12. The organisms that break-down dead remains & waste products of organisms (complex organic substances) into simple inorganic substances are called a) Decomposers b) Detritivores b) Carnivores d) Parasites Answer: a) Decomposers 13. The series of organisms feeding on one another or organisms taking part at various biotic levels is called a) Food chain b) Trophic level c) Food web d) Niche Answer: a) Food chain 14. Each step or level of the food chain forms a a) Food web b) Niche c) Trophic level d) Habitat Answer: c) Trophic level 15. In a food chain, third trophic level is occupied by a) herbivore b) carnivore c) decomposer d) producer Answer: b) carnivore 16. Which of the two in the following sets belong to the same trophic level? a) Grass; Grasshopper b) Goat; Spider c) Hawk; Rat d) Frog; Lizard Answer: d) Frog; Lizard 17. Which of the following always belong to first trophic level? a) Autotrophs b) Heterotrophs b) Decomposers d) Herbivores Answer: a) Autotrophs 18. Herbivores (primary consumers) belong to
© 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.
© www.bankofbiology.com 3 c) Coal is toxic and would harm the body instead of providing energy. d) Coal is already fully oxidized and contains no chemical energy to release. Answer: b) 34. Which of the following is biodegradable? a) Nylon b) Polythene bag c) Rubber d) DDT Answer: c) Rubber 35. Average time to break down a glass bottle is a) 10-20 years b) 50-80 years b) 200 years d) 500 years Answer: d) 500 years 36. Which of the following is not biodegradable plastic? a) Polylactic acid b) Polythene c) Polyhydroxyalkanoates d) Polybutylene succinate Answer: b) Polythene