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प्रश्न
In a village in Karnataka, people started cultivating crops all around a lake which was always filled with water. They added fertilisers to their field in order to enhance the yield. Soon they discovered that the waterbody was completely covered with green floating plants and fishes started dying in large numbers.
Analyse the situation and give reasons for excessive growth of plants and death of fish in the lake.
उत्तर
People added excessive fertilisers in their fields which leached down to the lake during rains. Since phosphates and nitrates are the main constituents of fertilisers, the lake became abundant in these ions. These ions led to excessive plant growth in lake, thereby, cutting off oxygen supply for the fishes living in it. So, due to insufficient availability of dissolved oxygen and nutrients fishes started dying in large numbers.
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संबंधित प्रश्न
How can you help in reducing the problem of waste disposal? Give any two methods.
Students in a school listened to the news read in the morning assembly that the mountain of garbage in Delhi suddenly exploded and various vehicles got buried under it. Several people were also injured and there was traffic jam all around. In the brain storming session the teacher also discussed this issue and asked the students to find out a solution to the problem of garbage. Finally they arrived at two main points -one is self management of the garbage we produce and the second is to generate less garbage at individual level.
1) Suggest two measures to manage the garbage we produce.
2) As an individual, what can we do to generate the least garbage? Give two points.
3) List two values the teacher instilled in his student in this episode.
Mention any two sources of wastes.
What is garbage?
How will you register individual participation in solid waste management?
What is meant by domestic waste?
What is eutrophication?
Study the image below and write down three items you have at home in each category of waste.
Biodegradable ______
The use of microorganism metabolism to remove pollutants such as oil spills in the water bodies is known as ____________.
How does recycling help reduce pollution?
Unwanted materials pollute our ______.
Plastic bags and food packaging is a ______ item.
What is waste collection?
What is transportation?
What is compost?
The burning of solid waste in ______ is called incineration.
Match the following:
| i. | Avoid the usage | a. | Recycle |
| ii. | Sharing newspapers | b. | Incinerate |
| iii. | Using fountain pens | c. | Buying packaged food |
| iv. | Using old clothes to make paper | d. | Reducing |
| v. | Human anatomical waste | e. | Reusing |
What is Landfill?
What are the two major types of solid wastes?
Provide a suitable term that expresses the meaning of the following statement.
An area where a lot of garbage is collected, spread out and covered with soil.
