Previous Year Question

The Ocean is among the largest and relatively most stable ecosystems on Earth. Oceans cover approximately 71% of the Earth's surface and contain nearly 97% of its total water. Their enormous size, High Specific Heat Capacity of water, relatively slow temperature changes, and extensive Nutrient Cycles play important roles in maintaining long-term ecological stability.

The primary reason for oceanic stability is the High Specific Heat Capacity of Water. Water can absorb substantial amounts of heat while warming relatively slowly and also cools gradually when releasing heat. This property is known as Thermal Inertia. Additionally, Ocean Currents, waves, and tides facilitate the distribution of heat and nutrients. Consequently, many environmental changes occur more slowly in oceanic systems than in terrestrial regions.

Marine Ecosystems contain complex Food Webs involving Producers, Consumers, and Decomposers. Phytoplankton are major Primary Producers that generate organic matter through Photosynthesis. They are consumed by Zooplankton, which support small fish and other aquatic organisms. Larger fish and marine mammals occupy higher Trophic Levels. The decomposition of organic matter by microorganisms facilitates Nutrient Recycling, supporting the functioning of marine ecological processes.

Among the other options, the Desert Ecosystem is affected by extreme temperature variations and water scarcity. The Mountain Ecosystem is strongly influenced by altitude, slope, snowfall, and climatic conditions. The Forest Ecosystem supports high biodiversity and can be stable under many conditions, but it may be affected by wildfires, deforestation, and other disturbances. Oceans are also vulnerable to Climate Change, pollution, and Ocean Acidification; therefore, their stability is neither absolute nor permanent. Nevertheless, because of their enormous size and ability to maintain thermal balance, oceans are considered the most stable ecosystem among the given options.