1. IUCN is an International organization working in the field of nature conservation and sustainable use of natural resources.
2. It provides public, private and non-governmental organisations with the knowledge to enable human progress, economic development and nature conservation to take place together.
Vision of IUCN:
The vision of IUCN is 'A just world that values and conserves nature'.

Recycled water is useful in,
1. Agriculture
2. Golf course irrigation
3. Toilet flushing
4. Landscape
5. Coding water for power plants and oil refineries
6. Dust control
7. Public parks
8. Construction activities.

Grey water is reusable waste water from residential, commercial and industrial, bathroom sinks, bath tub, shower drains and washing of clothes.

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. It creates more-efficient use of water resources.
2. It ensures that we have enough usable water.
3. It helps in decreasing water pollution.
4. It helps in increasing energy saving.

The plant is identified as chara, a hydrophyte, commonly called as stoneworts. They are multicellular grey green algae lives underfresh water.
Adaptation:
They have stem like and leaf like structure, they are adapted to protect the plant from excessive light. Their growth based orientation towards light functioning as a mechanism to protect them from excessive light.

i) Availability of more water than needed.
ii) Water current may damage the plant body.
iii) Water levels may change regularly.
iv) Maintain buoyancy in water.

Any feature of an organism or its part that enables it to exist under conditions of its habitat is called adaptation.

Burning fossil fuels, application of nitrogen-based fertilizers and other activities can increase the amount of biologically available nitrogen in an ecosystem. Nitrogen applied to agricultural fields enters rivers and marine systems. It alters the bio-diversity, changes the food web structure and destroys the general habitat.

i) Biotic or living factors which include plants, animals and all other living organisms.
ii) Abiotic or Non-living factors which includes temperature, pressure, water, soil, air and sunlight.