Biology Questions and Answers

Viruses are considered parasitic because they require a host cell to replicate. They do this by injecting their genetic material into the host cell and using the cell's machinery to replicate.

A natural habitat in ecology refers to an area where organisms naturally live and interact with their surroundings. A natural habitat encompasses the ecological conditions, physical features, and resources that support the survival and interactions of organisms within their natural environment. It includes factors such as climate, vegetation, soil composition, and other biotic and abiotic components.

Pollination in plants refers to the transfer of pollen from the anther (male reproductive organ) to the stigma (female reproductive organ) of a flower.

The concept of trophic levels in a functioning ecosystem refers to the levels of energy flow within the ecosystem. Trophic levels represent the hierarchical structure of feeding relationships within an ecosystem, with each level representing a different position in the food chain.

The correct identification of excretory organs in animals is lungs, kidneys, and skin.
Lungs play a vital role in excretion by eliminating carbon dioxide, a waste product of cellular respiration, through exhalation.
Kidneys are major excretory organs responsible for filtering blood and removing metabolic wastes, excess water, and dissolved solutes in the form of urine.
Skin, although primarily a protective organ, also participates in excretion. Sweating, through sweat glands in the skin, helps regulate body temperature and eliminates small amounts of metabolic waste such as urea and salts.