ECOSYSTEM (Part-II)

Stomata in desert plants remain open even at night. Thus, desert plants absorb carbon dioxide (CO₂) during the night, storing it for use in photosynthesis during the day when stomata are closed to prevent water loss.

Potable water, also known as drinking water, comes from surface and ground sources and is treated to levels that meet standards for consumption.

The water cycle, also known as the hydrologic cycle or the hydrological cycle, describes the continuous movement of water on, above, and below the surface of the Earth. During this process, water changes its state from one phase to another, but the total number of water particles remains the same.

All those things present in our environment in which life takes place (such as humans, flora, fauna, fish, livestock, etc.) are called "bio-resources."

Forests are renewable sources. They are helpful in many ways, including providing oxygen, conserving soil, providing habitat to many animals, and helping bring good rainfall to the surrounding areas. In addition, forests play an essential role in the water cycle and air quality.

The forest is said to be a dynamic living unit because forests absorb carbon dioxide and release oxygen.

Sludge is a byproduct of sewage treatment and can be decomposed to produce biogas.

Solids like fats, grease, and oil that float on top of liquid wastewater are called "sludge" or "scum." Sludge is a common term used in wastewater treatment to describe the layer of floating material that accumulates at the surface of tanks or treatment units. It is usually made up of a combination of oils, fats, grease, and other organic materials that are lighter than water and do not dissolve easily. Sludge can cause problems in wastewater treatment systems by clogging pipes and inhibiting the growth of bacteria needed for treatment. Therefore, it is important to remove scum regularly to maintain proper wastewater treatment.

Impurities suspended in sewage are called contaminants. These are organic chemical substances released into the urban environment, which collect in sewage through industrial and domestic sources.

A breathing root is NOT a storage root. Breathing roots are respiratory roots found in halophytes, such as mangroves.