• Rainwater harvesting is the collection and storage of rainwater for reuse on-site, rather than allowing it to run off. These stored waters are used for various purposes such as gardening, irrigation, etc.
• The components of the rainwater harvesting system include  Catchments, Coarse mesh, Gutters, Conduits, First-flushing,  Filter, Storage facility.
• Conduits are pipelines or drains that carry rainwater from the catchment or rooftop area to the harvesting system. Conduits can be of any material like polyvinyl chloride (PVC) or galvanized iron (GI), materials that are commonly available.
  
• Hence Conduits are the component of the rainwater harvesting system.
• So, the correct answer is 'Conduits'.

• Rainwater harvesting is the collection and storage of rainwater for reuse on-site, rather than allowing it to run off. 
•  These stored waters are used for various purposes such as gardening, irrigation, etc.
  
• Broadly there are two ways of harvesting rainwater. They are Surface runoff harvesting and Rooftop rainwater harvesting.
  
• Hence Rooftop and runoff are the types of rainwater harvesting methods.
• So, the correct answer is 'Both A and B'.

Ground water is considered as the major source of fresh water.

97% of earth surface is covered by ocean and seas.

The rainwater ,groundwater and surface runoff are the source of freshwater.

Plankton's are passively drifting or floating organisms. Most of these minute organisms, plankton includes photosynthesizing organisms as well as heterotrophic organisms.

The biome occurs in equatorial or sub equatorial regions where both rainfall and warmth are abundant Rainfall is above 140 cm/yr usually between 200-500 cm/yr. It may be upto 1000 cm. Rain occurs through major parts of the year.

Water is essential for all living beings (human, animal and plant) for various
metabolic reactions. They gain water not on;y through the action of drinking but also from the food they eat.

The following represents water wise habits to conserve water. Turn off taps while brushing.  Mop the floor instead of washing.

You can get the following messages from the posters about the world water day. Save every drop of water. You can save water. Every drop counts.

Earth appears blue from the space.

22 March is celebrated as the world water day.

The water that is fit for use is freshwater.

It is estimated that in a few years from now more than one third of the people in the world could face water scarcity.

The amount of water recommended by the United Nations for drinking, washing, cooking and maintaining proper hygiene is a minimum of 50 litres per person per day. This amount is about  two and a half buckets of water per person per day.