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In desert regions with high daytime temperatures, low nighttime temperatures, and minimal air humidity, which statement is accurate?

1. A fish that cannot tolerate significant changes in salt levels in water is referred to as stenohaline. Many freshwater fish fall into this category and cannot survive in salty environments like oceans. Conversely, species like salmon or fish in estuaries are often euryhaline, meaning they can adapt to varying salinity levels.
2. Tropical forests in regions like Kerala and Assam are among the most productive terrestrial ecosystems.
3. Loamy soil is ideal for plant growth due to its excellent aeration, nutrient availability, and water retention properties.
4. The dark color of soil is influenced by high levels of organic matter, which come from the decomposition of living organisms.

Correct answer: The dark color of soil is influenced by high levels of organic matter, which come from the decomposition of living organisms.

Solution

Option D is correct because high organic matter in the soil, derived from the decay of living organisms, contributes to its dark color. This is a direct fact related to soil composition.

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