Question

"sun is the ultimate source of energy for all living organisms".Justify this statement with reference to plants, herbivores as well as carnivorous.

Answer 1

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Sun is the only source through which plants produce their food and it is used as a form of energy by entire living world. Hence, Sun is the ultimate source of energy for all living organisms.

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Answer 2

For all organisms, the sun, or solar radiation, is the ultimate source of energy. Plants are primary producers of energy from the sun. Plants use sun, chlorophyll, water, carbon dioxide and nutrients to manufacture glucose, an alternate form of energy. Glucose stores heat and energy. Because animals cannot produce energy directly from the sun, they must eat plants or other animals that eat plants, and acquire energy, either directly or indirectly, from glucose. Animals that eat plants exclusively are called herbivores. Animals that only eat meat are called carnivores. Omnivores are animals that eat both plants and meat. The most efficient and most concentrated energy is consumed at the lowest part of the food chain: directly from plants.Herbivores are the animals at the bottom of the animal food chain. These animals eat plants to survive. Herbivores are one step away from the ultimate source of energy, the sun. Herbivores have digestive systems that allow them to process all types of plants, including grasses. Cows, sheep, giraffes and elephants are herbivores. Herbivores require an abundant intake of energy to stay alive. Many herbivores eat, or graze, all day.Carnivores, animals that eat other animals, are the last step in the food chain, and are the farthest away from the ultimate source of energy. Predators--like lions, wolves, hawks and other animals that kill prey and eat their meat--are carnivores. Carnivores eat herbivores, and sometimes eat omnivores and other carnivores. Although they are at the least efficient end of energy-use in the food chain, carnivores are essential in the ecosystem because they prevent overpopulation by other animals.Omnivores are animals that eat plants and other animals. Omnivores generally eat only fruits and vegetables, and cannot digest grasses. Omnivores also eat animals that are herbivores. These omnivores kill and eat their own food. Others are scavengers, eating carrion or decomposing meat. Some omnivores are opportunists. They eat whatever they can find, including berries, roots, fruit, eggs and the young of other animals. In the food chain, omnivores are two steps away from the ultimate source of energy--the sun. Humans and bears are animals that are omnivores.