Questions

Active transport is a method of transport of ions or molecules along the cell membrane in the cell from lower to higher concentration region and which needs cellular energy.

There are three main types of Active Transport. They are:

1. The Sodium-Potassium pump,
2. Exocytosis, and
3. Endocytosis.

In urban areas, rain water available from roof tops of buildings, paved and unpaved areas goes waste. This water can be recharged to aquifer and can be utilized gainfully at the time of need. In areas where the surface soil is impervious and large quantities of roof water or surface runoff is available within a very short period of heavy rainfall, the use of trench/ pits is made to store the water in a filter media and subsequently recharge to ground water through specially constructed recharge wells.

Gully plugs are built using local stones, clay and bushes across small gullies and streams running down the hill slopes carrying drainage to tiny catchments during rainy season.It is applicable only in rural areas.