2nd PUC Biology Series 5 December 3, 2020December 22, 2020wefru PUC Science 2nd Year Biology Series-5 quiz 0 Created on December 01, 2020 By wefru Biology Series 5 TEST YOUR KNOWLEDGE OF SCIENCE 1 / 10 Q 41. Pyramid of numbers in a pond ecosystem is irregular inverted upright spindle shaped 2 / 10 Q.43 Which one of the following gases contributes maximum to the green house effect’ on the earth? carbon dioxide chlorofluoro carbon Freon methane 3 / 10 Q.44 The dominant second trophic level, in a lake ecosystem, is phytoplankton zooplankton benthos plankton 4 / 10 Q.45 Sounds above what level are considered hazardous noise pollution? above 80 dB above 150 dB above 30 dB above 120 dB 5 / 10 Q.46 A disease caused by eating fish contaminated by industrial waste, containing mercury compounds, is called osteosclerosis Hashimoto’s oxidase Bright’s disease minimata disease 6 / 10 Q.47 When huge amount of sewage is dumped into a river, its B.O.D. will slightly decrease remain unchanged increase decrease 7 / 10 Q.48 If we completely remove the decomposers from an ecosystem, its functioning will be adversely affected, because mineral movement will be blocked the rate of decomposition will be very high energy flow will be blocked herbivores will not receive solar energy 8 / 10 Q.48 If we completely remove the decomposers from an ecosystem, its functioning will be adversely affected, because mineral movement will be blocked herbivores will not receive solar energy energy flow will be blocked the rate of decomposition will be very high herbivores will not receive solar energy. 9 / 10 Q.49 In a biotic community, the primary consumers are detritivores herbivores carnivores omnivores 10 / 10 Q.50 The abundance of a species population, within its habitat, is called relative density regional density absolute density niche density Your score is The average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz