2nd PUC Biology Series 12 December 3, 2020December 22, 2020wefru PUC Science 2nd Year Biology Series-12 quiz 0 Created on December 02, 2020 By wefru 2nd puc Biology Series 12 TEST YOUR KNOWLEDGE OF SCIENCE 1 / 10 Q.111 Escherichia coli is used as an indicator organism to determine pollution of water with heavy metals industrial effluents faecal matter pollen of aquatic plants 2 / 10 Q.112 Mycorrhiza is an example of symbiotic relationship ectoparasitism endoparasitism decomposers 3 / 10 Q.113 Certain characteristic demographic developing countries are high fertility, low or rapidly fall rate, rapid population growth and age distribution high fertility, high density, mortality rate and a very young age high infant mortality, low fertility population growth and a very distribution high mortality, high density, uneven growth and a very old age distribution. 4 / 10 Q.114 What is a keystone species? a common species that has plenty of biomass yet has a fairly low impact on the community organization a rare species that has minimal impact on the biomass and on other species in the community a species which makes up only a small proportion of the total biomass of a community, yet has a huge impact community’s organization and s a dominant species that constitutes a large proportion of the biomass and which affects many other species. 5 / 10 Q.115 Which of the following is expected to have the highest value (gm/m2/yr) in a grassland ecosystem? secondary production tertiary production gross production (GP) net production (NP) 6 / 10 Q.116 In 1984, the Bhopal gas tragedy took place because methyl isocyanate reacted with DDT reacted with ammonia reacted with CO2 reacted with water. 7 / 10 Q.117 Lead concentration in blood is considered alarming if it is 20 g / 100 ml 30 g / 100 ml 4 – 6 g / 100 ml 10 g / 100 ml. 8 / 10 Q.118 . In which one of the following pairs is the specific characteristic of a soil not correctly method? Laterite – contains aluminium compound Terra rosa – most suitable for roses Chernozems – richest soil in the world black soil – rich in calcium carbonate 9 / 10 Q.119 An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having low stability and high resilience high stability and low resilience low stability and low resilience high stability and high resilience. 10 / 10 Q.120 The maximum growth rate occurs in stationary phase senescent phase lag phase exponential phase Your score is The average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz