Biology Chapter 27 Man and his Environment Mcqs Test Online 12th Class Punjab Boards

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Question 1 of 15

Biology

1. The main cause of the recent increase in the amount of CO₂ in the Earth’s atmosphere:

1.The burning of larger amounts of fossil fuels

2.The rapidly growing human population

3.Increased worldwide primary production

4.Increased worldwide standing crop biomass

Question 1 of 15

Question 2 of 15

2. Which of the following is also called greenhouse effect?

1.Ozone layer depletion

2.Acid rain

3.Global warming

4.All of them

Question 2 of 15

Question 3 of 15

3. Nutrient cycle always involve:

1.Rocks as reservoir

2.Movement of nutrients through the biotic community

3.Loss of the nutrients from the biosphere

4.The atmosphere as an exchange pool

Question 3 of 15

Question 4 of 15

4. How do nitrogen fixing bacteria contribute to the nitrogen cycle?

1.Return nitrogen to the atmosphere

2.Absorb nitrate from the soil

3.Change N₂ to ammonia

4.Change ammonium to nitrate

Question 4 of 15

Question 5 of 15

5. Which of the following is the graphical representation of ecological data of an ecosystem?

1.Pyramids

2.Succession

3.Niche

4.Habitat

Question 5 of 15

Question 6 of 15

6. Which of this ecosystem has the lowest net primary production per square meter?

1.Costal reef

2.An open ocean

3.A salt marsh

4.A grassland

Question 6 of 15

Question 7 of 15

7. Which of these levels of ecological study involves both abiotic and biotic components?

1.Organisms

2.Conservation ecology

3.Ecosystems

4.Population

Question 7 of 15

Question 8 of 15

8. Klater content of glaciers and polar ice caps

1.0.052%

2.93%

3.4%

4.2%

Question 8 of 15

Question 9 of 15

9. Of the total water of the world, oceans contain about:

1.2% water

2.4% water

3.93% water

4.50% water

Question 9 of 15

Question 10 of 15

10. Ozone layer is found in:

1.None of these

2.Stratosphere

3.Troposphere

4.Both a and b

Question 10 of 15

Question 11 of 15

11. Which is one group of organisms that is able to fix atmospheric nitrogen into forms usable by living organisms?

1.Fungi

2.Plants

3.Bacteria

4.Insects

Question 11 of 15

Question 12 of 15

12. Why are ecosystems dependent on a continual supply of solar energy?

1.Carnivores have a greater biomass than producers

2.Energy transformation results in a loss of usable energy to the environment

3.Energy cycles within and between ecosystems

4.Decomposers process the greatest amount of energy in an ecosystem

Question 12 of 15

Question 13 of 15

13. Producers of an ecosystem are:

1.None of these

2.Absorptive heterotrophs

3.Ingestive heterotrophs

4.Autographs

Question 13 of 15

Question 14 of 15

14. Total water resources of the world is

1.1400 million km³

2.1000 million km³

3.800 million km³

4.1500 million km³

Question 14 of 15

Question 15 of 15

15. A population carrying capacity:

1.May change as environmental conditions change

2.Generally remains constant over time

3.Can be accurately calculated

4.Can never be exceeded

Question 15 of 15

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