Ecosystem Dynamics, Functioning, and Resilience - Ecosystems are dynamic in nature; their characteristics can vary over time. Disruptions to any physical or biological component of an ecosystem can lead to shifts in all its populations.
Ecosystem Dynamics, Functioning, and Resilience - Ecosystems are dynamic in nature; their characteristics can vary over time. Disruptions to any physical or biological component of an ecosystem can lead to shifts in all its populations.: Overview
This topic covers various concepts like Pollution Caused by Burning of Fossil Fuels, , etc.
Important Questions on Ecosystem Dynamics, Functioning, and Resilience - Ecosystems are dynamic in nature; their characteristics can vary over time. Disruptions to any physical or biological component of an ecosystem can lead to shifts in all its populations.
Coliform bacteria are mainly present in human faeces. Drinking water should not contain more than 1 coliform per 100 mL. The graph shows the amount of coliforms found in four water samples collected for a study.
The same study was repeated over a period of five years. Which questions can be answered by comparing the results of the study?
Coliform bacteria are mainly present in human faeces. Drinking water should not contain more than 1 coliform per 100 mL. The graph shows the amount of coliforms found in four water samples collected for a study.
Bathing water should not contain more than 1000 coliforms per 100 mL. Which water sample is safe for bathing?
Coliform bacteria are mainly present in human faeces. Drinking water should not contain more than 1 coliform per 100 mL. The graph shows the amount of coliforms found in four water samples collected for a study.
What can be concluded from the graph?
Which of these steps can help to reduce air pollution?
The table shows the properties of four water samples.
| Water Sample | Smell | Colour |
| Sample 1 | No smell | Slightly muddy |
| Sample 2 | Strong bad smell | Muddy and greenish |
| Sample 3 | Very light smell | Colourless |
| Sample 4 | No smell | Colourless |
In which water source will the survival of aquatic animals be the most difficult?
The table shows the properties of four water samples.
| Water Sample | Smell | Colour |
| Sample 1 | No smell | Slightly muddy |
| Sample 2 | Strong bad smell | Muddy and greenish |
| Sample 3 | Very light smell | Colourless |
| Sample 4 | No smell | Colourless |
Which water sample is likely to be least polluted?
Which of these activities causes water pollution?
Answer the following question based on the given information.
Hydrogen gas is an excellent fuel. It has a high calorific value and produces only water as the product of combustion. It is considered to be a potentially important, non-polluting energy source of the future.
Hydrogen is labelled with different 'colours' based on the method by which it is produced, as given below:
- green hydrogen: manufacturing process does not produce carbon dioxide
- blue hydrogen: manufacturing process produces carbon dioxide but it is separated and stored
- grey hydrogen: manufacturing process produces carbon dioxide which is released into the air
The widespread use of which type(s) of hydrogen will help in containing global warming?
Seema fills four similar fish tanks with freshwater from different sources. She puts six freshwater fish in each tank. The table shows her findings after two days.
| Tank | Findings |
| Tank 1 | All fish are dead. |
| Tank 2 | 1 fish is dead, and 5 fish are alive. |
| Tank 3 | All fish are alive. |
| Tank 4 | 2 fish are dead, and 4 fish are alive. |
Seema repeats the activity by putting only one fish in each tank. Can she rely on the results this time? Explain your answer.
Seema fills four similar fish tanks with freshwater from different sources. She puts six freshwater fish in each tank. The table shows her findings after two days.
| Tank | Findings |
| Tank 1 | All fish are dead. |
| Tank 2 | 1 fish is dead, and 5 fish are alive. |
| Tank 3 | All fish are alive. |
| Tank 4 | 2 fish are dead, and 4 fish are alive. |
Which tank is likely to have been filled with the most polluted water?
A children’s park has only green and blue bins. In which bin should empty juice cans be dumped? Explain.
Which source of energy emits large amounts of greenhouse gases?
Which of these statements is true about vermicomposting?
Should plastic waste be dumped in water bodies? Explain your answer.
Which of these is an example of reducing waste at home?
What are CFCs? What are their adverse effects?
Air is a _____ of gases.
