Water conservation isthe preservation control and management of water resources. It also includes activities to protect the hydrosphere and to meet the current and future human demand.

The theme for world water day 2018 is "Nature for water" - exploring nature-based solutions to the water challenge we face in 21^st century.

1. The roots of mesophytes are well developed and are provided with root caps.
2. The stem is generally straight and branched.
3. The leaves are generally broad and thin.
4. The presence of waxy cuticle in leaves traps the moisture and lessons the water loss.
5. Leaves have stomata which close in extreme heat and wind to prevent transpiration.

1. More carbon moves into the atmosphere due to burning of fossil fuels and deforestation.
2. Most of the carbon in atmospheric is in the form of carbon dioxide. carbon dioxide is a green house gas by increasing the amount of carbon dioxide, earth became warmer. This leads to greenhouse effect and global warming.

1. Rhizobium fixes Nitrogenous compounds in the soil.
2. It occurs in the root nodules of the leguminous plants like pea and beans.

At home, we can conserve water by
1. Using a bucket of water to take bath than taking a shower.
2. Using low flow taps.
3. Using recycled water for lawns.
4. Repairing the leaks in the taps.
5. Recycling or reusing water wherever it is possible.
At school we could save water by
1. Collecting roof top water through, Rain water harvesting methods .
2. Creating awareness on water conservation by sticking poster-s.of slogans near the taps.
3. Using recycled water for lawns.
4. If not using any tap turn it off.
5. Report leaks. Make it a classroom activity to check for leaks regularly.
6. Bring a water bottle to school, At the end of the day, any leftover water can be poured onto the garden.

1. Earthworms are commonly found living in soil, feeding on live and dead organic matter.
2. The faecal wastes are called worm castings which are rich in nitrogenous content adding fertility to the soil.
3. Earthworm plays a large role in keeping soil health facilitating aerators, water infiltration and producing organic matter to increase crop growth.
Adaptation to light - Nocturnality:
1. Earthworms are sensitive to light. It has no eyes but sensitive to light through light sensitive cells present in their skin.
2. They give the skin the capacity to detect light and changes its light intensity, They react negatively to bright light (Photophobic). It remains in its burrow during the day to avoid light.
Adaptation to temperature - Aestivation:
1. When the soil becomes too hot or dry, Earthworms become inactive and undergo a process called aestivation. Earthworm moves deeper into the soil. It secretes mucus and lowers their metabolic rate in order to reduce water loss.
2. They remain dormant until conditions become favourable, they come out of their burrow during rainy season. The ideal temperature range is 60 - 80°F.

1. Rain water harvesting
2. Improved irrigation techniques
3. Active use of traditional water harvesting structures.
4. Minimizing domestic water consumption.
5. Awareness on water conservation.
6. Construction of farm ponds.
7. Recycling of water.

1. They provide water to growing crops, without waiting for rainfall.
2. They provide water for irrigation even when there is no rain.
3. They reduce soil erosion.
4. They recharge ground water.
5. They improve drainage.
6. The excavated soil can be used to enrich soil in fields and ·Ievelling lands.
7. They promote fish rearing.
8. They provide water for domestic purposes and livestock.