How do Organisms | Class 10 Science Notes

DNA copying is crucial in reproduction because it ensures that the genetic information is accurately passed from the parent organism to the offspring. This copying allows the offspring to inherit traits and characteristics of the parent, maintaining the continuity of species. Without DNA copying, reproduction would not result in offspring with the same genetic makeup, leading to loss of hereditary information.

Variation is beneficial to a species because it increases the genetic diversity within the population, which helps the species adapt to changing environments and survive over time. Different traits may provide advantages under different conditions, ensuring the species' survival. However, for an individual, variation may not always be beneficial because some variations can be harmful or disadvantageous, reducing the individual's chances of survival or reproduction.

More complex organisms have highly specialised tissues and organs that perform specific functions. Regeneration requires the ability to regrow entire body parts or whole organisms from fragments. In complex organisms, cells are differentiated and cannot revert to a pluripotent state easily, limiting their ability to regenerate whole new individuals. Additionally, the complexity of body organisation and the need for precise coordination of multiple systems make regeneration of a whole organism un

Vegetative propagation is practised because it allows the production of new plants that are genetically identical to the parent plant, ensuring the preservation of desired traits. It is also faster than growing plants from seeds and can be used to propagate plants that do not produce viable seeds or have seeds that take a long time to germinate.