Ecosystem Nutrition and Energy Flow

Omnivorous animals consume both plant and animal matter. They have adaptations that allow them to digest and derive nutrition from both sources, like humans, bears, and pigs.

Amoeba ingests food through a process called phagocytosis, where it extends pseudopodia (temporary cytoplasmic projections or 'false feet') around food particles to engulf and trap them in a food vacuole.

Fungi store their food reserves as glycogen, similar to animals. Plants store starch, and oils are found in various organisms. Polyamines are not a food reserve but nitrogen compounds involved in cellular processes.

Bacteria and fungi are the primary decomposers in ecosystems, breaking down dead organic matter and recycling nutrients back into the soil - hence called 'scavengers of the earth'. Animals, soil/water, and birds are not primarily scavengers in the ecological sense.

Omnivores are animals that consume both plant and animal matter. Unlike herbivores (which eat only plants) or carnivores (which eat only meat), omnivores have digestive systems adapted to process both types of food. Common examples include humans, bears, and pigs.

Amoeba obtains food through phagocytosis, where it extends pseudopodia (false feet) around food particles, engulfing them into food vacuoles. This is different from photosynthesis (making food from light) or photolysis (breaking molecules using light).

Pseudopodia are temporary cytoplasmic extensions of the cell membrane that amoebas use for movement and feeding. When an amoeba encounters food, it extends pseudopodia around the particle and encloses it through phagocytosis. The term literally means 'false feet' in Greek. Options A and B are incorrect because unicellular organisms don't have legs or hands.

The five main steps in animal nutrition are: 1) Ingestion (taking in food), 2) Digestion (breaking down food), 3) Absorption (taking nutrients into cells), 4) Assimilation (using nutrients for growth/repair), and 5) Egestion (removing undigested waste). This sequence applies from simple organisms like amoeba to complex mammals.

Zoo-plankton form the second trophic level in a freshwater lake. Zooplanktons are primary consumers.

Bird is a secondary consumer in a grazing food chain.

Common detritivore in ecosystem are fungus and bacteria.

Percentage of energy that can be stored by a herbivore after feeding on green plants is 10%.

Herbivorous animals are those that feed on plants. This comes from 'herb-' (plant) + '-vorous' (eating). Carnivorous animals eat meat, which is the opposite. The term 'illegal' is unrelated to animal feeding habits.

The ecological 10% rule states that only about 10% of energy is transferred from one trophic level to the next. Autotrophs (producers) = 100 kg. Primary consumers (herbivores) = 10 kg (10% of 100). Secondary consumers (carnivores that eat herbivores) = 1 kg (10% of 10). However, secondary consumers that eat primary consumers would be at the third trophic level, receiving 10% of 10 kg = 1 kg. But the question asks for secondary consumers directly consuming primary consumers, which would be 10% of the producer biomass.

Vultures are known as scavengers and they help in the recycling of nature by eating dead animals.