If a marine fish is placed in a fresh water aquarium, will it be able to survive? Give reason.

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Q. If a marine fish is placed in a fresh water aquarium, will it be able to survive? Give reason.

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Step 1. Sea water has a salinity of roughly 30-35 ppt, while fresh water has a salinity below 5 ppt -- a very large difference in dissolved salt concentration. Step 2. Most marine fish are stenohaline, meaning they are physiologically adapted to a narrow salinity range close to that of the sea, and lack the osmoregulatory machinery needed to cope with a sharply different external salinity. Step 3. Placed in fresh water, a marine fish would face severe osmotic stress: water would tend to move into its body faster than it can be expelled, disrupting its internal salt/water balance. Step 4. Because of this osmotic problem, the fish would not be …

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Same / Similar Concept — real previous-year questions on the same or a closely similar concept, not this exact question.

CBSE 2022Set ANNUAL5 marks
$Q. Describe the major abiotic factors and their importance for living beings.$
(OR)
$(a) What is so special about the tropical region that might account for its greater bio-diversity?$
(3)
(b) What is the reason that the species diversity of animals is more than that of plants? Write any two reasons. (2)
›Reveal solutionSolution
Temperature, water, light and soil are the four principal abiotic factors shaping where and how organisms live.

Temperature — probably the single most ecologically relevant environmental factor. It governs the rate of enzyme-catalysed metabolic reactions and most other physiological functions of organisms. Average temperature varies latitudinally and seasonally, and organisms are classed as eurythermal (tolerate wide temperature range) or stenothermal (tolerate narrow range) — this determines their geographic distribution.

Water — its availability is another important factor influencing the life of organisms, especially productivity and distribution of plants. Aquatic organisms face challenges of salinity (osmotic regulation), and the chemical composition of water (salinity, pH) affects the survival of aquatic organisms.

Light — sunlight is the ultimate source of energy, essential for photosynthesis by autotrophs which forms the base of most food chains; day-length (photoperiod) also affects reproduction/flowering in many organisms, and in aquatic ecosystems, light penetration depth limits where photosynthetic organisms can survive.

Soil — characteristics such as soil composition, grain size, pH, mineral composition and topography vary with vegetation and climate, and greatly determine which plants (and consequently animals dependent on them) can be supported in a region.

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Q.If a marine fish is placed in a fresh water aquarium, will it be able to survive? Give reason.

Concept understanding — Major Abiotic Factors

Q.If a marine fish is placed in a fresh water aquarium, will it be able to survive? Give reason.

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