विषयों
अध्याय
विषयों
मुख्य विषय
अध्याय
Advertisements
Advertisements
Biology (Theory)
Samson and Dorothy surveyed two islands, ‘A’ and ‘B’. They recorded the relevant data in the following format in their research folder:
| Parameter | Island A | Island B | |
| (a) | Area (A) | 45 × 103 Km2 | 12 × 105 Km2 |
| (b) | Regression co-efficient (Z) | 1 | 1 |
| (c) | Y-intercept | 20 | 10 |
- Derive the species-richness for each island.
- Which island exhibits greater biodiversity? Support your answer with a reason.
Chapter: [15] Biodiversity and Its Conservation
Concept: Biodiversity
Concept: Biodiversity
What do you mean by Biochemical Oxygen Demand (BOD)?
Chapter: [18] Environmental Issues
Concept: Environmental Issues >> Water Pollution
Concept: Environmental Issues >> Water Pollution
State any four measures to control noise pollution.
Chapter: [18] Environmental Issues
Concept: Environmental Issues >> Noise Pollution
Concept: Environmental Issues >> Noise Pollution
Discuss the various In-situ and Ex-situ strategies for conservation of biodiversity.
Chapter: [18] Environmental Issues
Concept: Deforestation and Its Causes
Concept: Deforestation and Its Causes
The level of air pollution is very high in a city. Suggest any four measures which should be taken by the government to control it.
Chapter: [18] Environmental Issues
Concept: Prevention and Control of Air Pollution
Concept: Prevention and Control of Air Pollution
|
The scientists from a research institute collected samples of water from sewage pipes of two different cities, A and B. On analysis, the BOD value of the sample from city A was found to be 500 mg/L. The BOD value of the sample from city B was 200 mg/L. |
- Which one of the two cities needs a sewage treatment plant?
- Briefly discuss the steps involved in the treatment of sewage.
- What will be the effect of sewage treatment on the value of BOD?
Chapter: [18] Environmental Issues
Concept: Eutrophication
Concept: Eutrophication
