Punjab 12th Class Biology Chapter 27 Man and his Environment Mcqs Test Online Biology Chapter 27 Man and his Environment Mcqs Test Online 12th Class Punjab Boards 123456789101112131415Show paginator Hide paginator Question 1 of 15Biology 1. Which of the following is also called greenhouse effect? 1.Acid rain 2.All of them 3.Global warming 4.Ozone layer depletion Question 1 of 15Question 2 of 15 2. Total water resources of the world is 1.1000 million km³ 2.800 million km³ 3.1400 million km³ 4.1500 million km³ Question 2 of 15Question 3 of 15 3. Which of the following is the graphical representation of ecological data of an ecosystem? 1.Habitat 2.Pyramids 3.Niche 4.Succession Question 3 of 15Question 4 of 15 4. A population carrying capacity: 1.Can never be exceeded 2.Generally remains constant over time 3.Can be accurately calculated 4.May change as environmental conditions change Question 4 of 15Question 5 of 15 5. Klater content of glaciers and polar ice caps 1.0.052% 2.4% 3.2% 4.93%Question 5 of 15Question 6 of 15 6. How do nitrogen fixing bacteria contribute to the nitrogen cycle? 1.Absorb nitrate from the soil2.Change ammonium to nitrate 3.Change N₂ to ammonia 4.Return nitrogen to the atmosphere Question 6 of 15Question 7 of 15 7. Producers of an ecosystem are: 1.Autographs 2.Absorptive heterotrophs 3.Ingestive heterotrophs 4.None of these Question 7 of 15Question 8 of 15 8. The main cause of the recent increase in the amount of CO₂ in the Earth’s atmosphere: 1.Increased worldwide standing crop biomass 2.The rapidly growing human population 3.Increased worldwide primary production 4.The burning of larger amounts of fossil fuels Question 8 of 15Question 9 of 15 9. Ozone layer is found in: 1.None of these 2.Stratosphere 3.Troposphere 4.Both a and b Question 9 of 15Question 10 of 15 10. Which is one group of organisms that is able to fix atmospheric nitrogen into forms usable by living organisms? 1.Insects 2.Bacteria 3.Plants 4.Fungi Question 10 of 15Question 11 of 15 11. Which of these levels of ecological study involves both abiotic and biotic components? 1.Organisms 2.Population 3.Conservation ecology 4.Ecosystems Question 11 of 15Question 12 of 15 12. Which of this ecosystem has the lowest net primary production per square meter? 1.An open ocean 2.A grassland 3.A salt marsh 4.Costal reef Question 12 of 15Question 13 of 15 13. Of the total water of the world, oceans contain about: 1.93% water2.2% water 3.50% water 4.4% water Question 13 of 15Question 14 of 15 14. Nutrient cycle always involve: 1.The atmosphere as an exchange pool 2.Movement of nutrients through the biotic community 3.Rocks as reservoir 4.Loss of the nutrients from the biosphereQuestion 14 of 15Question 15 of 15 15. Why are ecosystems dependent on a continual supply of solar energy? 1.Carnivores have a greater biomass than producers 2.Decomposers process the greatest amount of energy in an ecosystem 3.Energy transformation results in a loss of usable energy to the environment4.Energy cycles within and between ecosystems Question 15 of 15 Loading... Test By Subject Punjab Test By Topics 12th Class Biology You Can Learn and Gain more Knowledge through our Online Quiz and Testing system Just Search your desired Preparation subject at Gotest.