Water Pollution I
High-Yield Trend
Questions 9 MCQs
Which one of the following statements is correct?
| 1. | Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies |
| 2. | Both Azotobacter and Rhizobium in root nodules of plants |
| 3. | Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and potassium for plant nutrition in the soil |
| 4. | At present it is not possible to grow maize without chemical fertilizers |
In which one of the following the BOD (Biochemical Oxygen Demand) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order?
1. SE < S < PE < DE
2. SE < PE < S 3. PE < S < SE < DE 4. S < DE < PE
Which one of the following is not a bioindicator of water pollution?
1. Sludge-worms
2. Blood-worms
3. Stone files
4. Sewage fungus
A lake near a village suffered heavy mortality of fish within a few days. Consider the following reasons for this:
| 1. | Lots of urea and phosphate fertilizer were used in the crops in the vicinity. |
| 2. | The area was sprayed with DDT by an aircraft. |
| 3. | The lake water turned green and stinky |
| 4. | Phytoplankton populations in the lake declined initially, thereby, greatly reducing photosynthesis. |
Which two of the above were the main causes of fish mortality in the lake?
1. 2, 3
2. 3, 4
3. 1, 3
4. 1, 2
DDT residues are rapidly passed through food chain causing biomagnification because DDT is:
1. lipo soluble
2. moderately toxic
3. non-toxic to aquatic animals
4. water soluble
In an area where DDT had been used extensively, the population of birds declined significantly because:
1. Birds stopped laying eggs
2. Earthworms in the area got eradicated
3. Cobras were feeding exclusively on birds
4. Many of the birds laid eggs, but the eggs did not hatch
Which one of the following is a wrong statement?
| 1. | Most of the forests have been lost in tropical areas |
| 2. | Ozone in upper part of atmosphere is harmful to animals |
| 3. | Greenhouse effect is a natural phenomenon |
| 4. | Eutrophication is a natural phenomenon in freshwater bodies |
An increase in the concentration of the toxicant at successive trophic levels is known as:
1. Biomagnifications
2. Biodeterioration
3. Biotransformation
4. Biogeochemical cycling
Eutrophication of water bodies leading to the killing of fishes is mainly due to non-availability of:
1. Food
2. Light
3. Essential minerals
4. Oxygen
Preparing Water Pollution I for NEET
Water Pollution I is a specific sub-topic that frequently appears in the NEET examination. Understanding the underlying principles and practicing targeted questions is key to mastering this concept.
The questions compiled above are previous year questions (PYQs) directly related to Water Pollution I. Practicing these specific questions helps you understand the difficulty level and the examiner's approach to this topic.
Topic Frequently Asked Questions
Is Water Pollution I a high-weightage topic?
You can refer to the priority and consistency badges at the top of this page. High priority topics should be thoroughly revised multiple times before the exam.
Should I memorize the solutions?
No, it is highly recommended to understand the core concept and methodology behind each solution rather than memorizing them, as exact questions are rarely repeated, but the concepts definitely are.