RIMS Nursing Officer - 2022
Non Nursing Subjects
Medium
Which of the following is NOT included in Trophic State Index (TSI) of environmental indicators?
Appeared in: RIMS Nursing Officer - 2022
Explanation
- Total calcium is a measure of water hardness, which is determined by the geology of the surrounding area and the dissolution of minerals like limestone.
- It is not a direct indicator of nutrient enrichment or algal biomass, which are the primary factors measured by the Trophic State Index (TSI).
- TSI focuses on the biological productivity (eutrophication) of a water body, which is driven by nutrients like phosphorus and nitrogen that fuel algal growth.
Why Other Options Were Wrong
- Option A: Total phosphorus is a core component of the Carlson's Trophic State Index because it is the primary limiting nutrient for algal growth in most freshwater systems.
- Option B: Total nitrogen is another key nutrient that fuels algal growth. While not in the original Carlson's TSI, it is a critical indicator of nutrient pollution and is used in many modified trophic indices.
- Option C: Chlorophyll-a is a fundamental component of the TSI. It is the main photosynthetic pigment in algae and serves as a direct, reliable measure of algal biomass (phytoplankton).
Related Visual
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Components of the Trophic State Index (TSI) for water quality assessment as background academic context rather than a clinical decision trigger.
- A high TSI indicates eutrophication, which can lead to Harmful Algal Blooms (HABs). These blooms can produce toxins (like microcystins) that are dangerous to humans and animals.
- Community health nurses have a role in public health surveillance and education. They should be aware of local water quality reports and advise the community on safety measures during HAB events.
- Nurses can educate the public about the risks of exposure to contaminated water, which include skin irritation, gastrointestinal illness, and neurological symptoms. It's crucial to teach that boiling water does not remove these toxins.
How to Approach the Question
- First, identify the core concept of the question, which is the Trophic State Index (TSI) and its purpose.
- Recognize the negative framing of the question ('NOT included'). This means you are looking for the option that is an outlier or does not fit with the others.
- Recall that the TSI measures the biological productivity (or nutrient enrichment) of a water body. This is primarily related to the growth of algae.
- Evaluate each option in the context of algal growth: Total phosphorus and total nitrogen are nutrients that feed algae. Chlorophyll-a is the pigment that makes up algae.
- Consider the final option, 'Total calcium'. Calcium is associated with water 'hardness' and mineral content from rocks, not directly with the nutrient-driven growth of algae.
- Conclude that Total calcium is the parameter that is not used to calculate the Trophic State Index.
Concept Tested & Keywords
- Concept Tested: Components of the Trophic State Index (TSI) for water quality assessment.
- Stem keywords: Trophic State Index, TSI, environmental indicators
- Lead-in keywords: NOT included
- Negative lead-in flag: The question asks to identify the parameter that is NOT used in the Trophic State Index.
Question ID
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Attempt every question from this paper in a timed mock, then review the full solution for each one.
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