The largest biomass in a terrestrial ecosystem is often found in forests, specifically in the form of trees. Forests can contain a substantial amount of living plant biomass, with large, mature trees contributing significantly to this biomass. Additionally, forests are also home to a diverse range of organisms, including various plants, animals, fungi, and microorganisms, which collectively contribute to the overall biomass of the ecosystem.

In the ocean, the base of the food pyramid is formed by phytoplankton. These are microscopic, photosynthetic organisms, primarily composed of algae and cyanobacteria. Phytoplankton play a critical role in marine ecosystems as primary producers, converting sunlight and nutrients into organic matter through photosynthesis. They form the foundation of the marine food web, as they are consumed by various herbivores, which are then preyed upon by larger carnivores, forming a complex and interconnected system of energy transfer and nutrient cycling in the ocean. Phytoplankton are responsible for producing a significant portion of the Earth's oxygen and are vital for supporting marine life and regulating global climate patterns.

Dr Gaurav H Tandon thank you for your contribution to the discussion

Moving from primary producers to top consumers in a terrestrial food chain, a part of energy is lost in respiration. Therefore, primary producers comprise the greatest biomass in these food chains. The trophic level that contains the greatest biomass in most ecosystems is the producers. Producers are organisms that are able to make their own food from sunlight or chemicals. Thus, they have access to 100% of the energy available. The Ocean is the planet's largest ecosystem, regulating the climate, and providing livelihoods for billions. In most ecosystems, the largest energy level and largest biomass can be found on the producer level. This occurs because producers obtain their energy from the sun, which is the most readily available resource and hence the most abundant at that level. The greatest biomass amount is found at the base trophic level that includes the producers. Since the primary consumers rely on producers for sustenance, the biomass amount of the producers would, therefore, be a limiting factor to the biomass of the primary consumers. Primary producers including bacteria, phytoplankton, and algae form the lowest trophic level, the base of the aquatic food web. Primary producers synthesize their own energy without needing to eat. Marine microbes include tiny photosynthetic phytoplankton and bacteria that form the base of marine food chains, becoming food for primary and secondary consumers like zooplankton, small fish, and filter feeders. At the bottom of the pyramid, you have producers. These are usually plants or other photosynthetic organisms, such as algae or photosynthetic bacteria. Producers are autotrophs, meaning they are self-feeding organisms that do so by making their own organic molecules. Phytoplankton also forms the base of virtually every ocean food web. In short, they make most other ocean life possible. Through photosynthesis these organisms transform inorganic carbon in the atmosphere and in seawater into organic compounds, making them an essential part of Earth's carbon cycle. As you probably know, the organisms at the base of the food chain are photosynthetic; plants on land and phytoplankton (algae) in the oceans. These organisms are called the producers, and they get their energy directly from sunlight and inorganic nutrients.

The largest biomass in a terrestrial ecosystem is often found in plants. Plants, including trees, shrubs, grasses, and other vegetation, collectively make up a significant portion of the terrestrial biomass. They form the foundation of the food chain by converting solar energy into chemical energy through photosynthesis. This process allows them to produce organic compounds, which are then consumed by herbivores, starting the flow of energy through the ecosystem.

As for the base of the food pyramid in the ocean, it is primarily composed of microscopic organisms called phytoplankton. Phytoplankton are tiny, single-celled algae and photosynthetic bacteria that float in the upper layers of the ocean. Like plants on land, phytoplankton uses sunlight to perform photosynthesis, producing organic matter and oxygen. They are the primary producers in marine ecosystems, serving as the primary food source for various marine organisms.

Phytoplankton plays a crucial role in the marine food web. They are grazed by zooplankton, which are small marine animals that feed on phytoplankton. Zooplankton, in turn, becomes prey for small fish and other marine organisms. This process continues up the food chain, ultimately supporting larger predators, including fish, marine mammals, and even some seabirds.

Phytoplankton's role in the ocean's food pyramid is comparable to that of plants in terrestrial ecosystems, as they both act as primary producers, supporting higher trophic levels in the ecosystem. The abundance and health of phytoplankton have a significant impact on marine food webs and the overall productivity of the oceans.

Dr Samsul Islam thank you for your contribution to the discussion

The trophic level that contains the greatest biomass in most ecosystems is the producers. Producers are organisms that are able to make their own food from sunlight or chemicals. Thus, they have access to 100% of the energy available. Moving from primary producers to top consumers in a terrestrial food chain, a part of energy is lost in respiration. Therefore, primary producers comprise the greatest biomass in these food chains. At the bottom of the ecological pyramid are the producers, and at the top, there are the consumers. Forest ecosystems have the highest biomass at the producer level and the lowest biomass at the top level of tertiary consumers.Plants make up the overwhelming majority of biomass on Earth. There are 320,000 species of plants, and their vital photosynthetic processes keep entire ecosystems from falling apart. In most ecosystems, the largest energy level and largest biomass can be found on the producer level. This occurs because producers obtain their energy from the sun, which is the most readily available resource and hence the most abundant at that level. Autotrophs, the producers in a food web, convert the sun's energy into biomass. Biomass decreases with each trophic level. There is always more biomass in lower trophic levels than in higher ones. Because biomass decreases with each trophic level, there are always more autotrophs than herbivores in a healthy food web. Wood is still the largest biomass energy resource today. Other sources include food crops, grassy and woody plants, residues from agriculture or forestry, oil-rich algae, and the organic component of municipal and industrial wastes. Primary producers including bacteria, phytoplankton, and algae form the lowest trophic level, the base of the aquatic food web. Primary producers synthesize their own energy without needing to eat. This food pyramid displays a basic marine food web. Organisms on the first trophic level, such as plants and algae, are consumed by organisms on the second trophic level, such as conchs and blue tangs. At the top of the food web is an apex predator, a shark. The foundation of the sea's food chain is largely invisible. Countless billions of one-celled organisms, called phytoplankton, saturate sunlit upper-ocean waters worldwide. These tiny plants and bacteria capture the sun's energy and, through photosynthesis, convert nutrients and carbon dioxide into organic compounds.The bottom level of the ocean's food chain is made up of one-celled organisms called phytoplankton. These tiny organisms are microscopic. They are so small they cannot be seen without a microscope. Billions of phytoplankton lives in the upper part of the ocean. In addition, ocean energy pyramids consist of the same four trophic levels previously described: primary producers, primary consumers, secondary consumers, and tertiary consumers. In ocean energy pyramids, groups of organisms are examined for the transfer of energy between them.