Plants perform the function of photosynthesis, in which they liberate oxygen gas. Thus, animals depend on plants for getting oxygen gas for breathing. 

The carbon dioxide of air being consumed by plants in photosynthesis is constantly put back into air by the respiration of animals and plants as well as by the burning of fuels by human beings. The plants depend on animals for getting carbon dioxide gas for photosynthesis.

Thus, plants and animals maintain the balance of oxygen and carbon dioxide in air and show their interdependence in nature.

Ways to conserve water are as follows:

1. Turn off the tap immediately after use. Get the leaking taps repaired immediately.
2. Take bath by filling water in a bucket and not directly under the flowing tap.
3. Wash the utensils by filling water in basin and not under the running water.
4. Use the water from washing rice, vegetables or fruits for watering the plants at home.
5. Do not use a full flush from the cistern in the toilet when a half flush is sufficient.

Excessive rain causes floods. The excessive rainfall due to heavy rains leads to many problems. Some of them are:

1. Heavy rains in the city lead to waterlogging of roads and streets which causes inconvenience to the people.
2. Heavy rains may cause floods as the river water starts overflowing from its banks and spread over a large area of land.
3. The animals living in water are carried away by the fast flowing flood waters.
4. Heavy rains also kill the animals living in soil as they do not get air to breathe when the soil gets covered with flood water. The people living in areas having drought conditions face many difficulties. Some of the problems faced by people are: i. In drought conditions, the soil does not have sufficient moisture to grow crops leading to shortage of food for people. ii. In drought conditions, the vegetation such as grass and other fodder does not grow well leading to shortage of fodder for domestic animals.iii. Due to shortage of food and fodder, many people living in drought areas migrate to other places along with their domestic animals in search of food and fodder. Some people and domestic animals may die of starvation.

So, we should supply food and fodder to the victims of drought.

Energy saved is energy generated. We cannot keep on producing non-renewable resources like petrol, diesel and electricity. So the need of the hour is the better utilization of existing resources. Energy depletion has become a global phenomenon at present time. The ever biggest problem that man has to face in near future is the energy crisis. Energy conservation is the most economical solution to shortages. Energy conservation reduces energy consumption and energy demand per capita. It refers to the preservation and maintenance of natural resources like water, soil, forest and mineral oil to meet human needs with proper care given to aesthetics and recreations too.

Mumbai imported Humboldt penguins from South Korea in the zoo.Humboldt penguins grow only up to around 2ft and that they don’t need snow. The water and air temperature in their enclosure has been set at around 14 degrees Celsius, just right for them.

1. We should eat high calcium foods as calcium is the most important mineral for bone health, and it's the main mineral found in your bones.

2. Vitamin D and vitamin K are extremely important for building strong bones. Vitamin D plays several roles in bone health, including helping your body absorb calcium. So we should sit under the sun.

3. Omega-3 fatty acids are well known for their anti-inflammatory effects. So, we should consume food rich in Omega- 3 fatty acids that protect against bone loss during the aging process.

4. Proteins are needed for the growth and repair of our body and helps in building strong bones.

Kabadiwala buys waste from us for recycling

Waste materials especially household wastes are called garbage. The garbage collected in dustbins in our homes, shops, offices and schools are taken away by sanitary staff and is dumped and disposed of according to the nature of garbage. There are two types of components in the garbage – useful and useless components.

Birds don't get shocked when they sit on electrical wires because they are not good conductors of electricity.

Their cells and tissues do not offer electrons an easier route than the copper wire they're already traveling along. As a result, the electricity bypasses the birds and keeps flowing along the wire instead.

We can move our body parts while we remain at the same place. This is called movement.

In silver plating, the object (eg.spood) to be plated is made the cathode of an electrolytic cell. The anode is bar of silver metal and the electrodyte must contain Ag⁺ ions (i.e. AgNO_3​), so that when the direct current is passed through the cell, positive (Ag⁺) ions move towards the negative anode (spoon) where they are neutralized by e− and stick to spoon as silver metal.

Carbohydrates are macronutrients and are one of the three main ways by which our body obtains its energy. They are called carbohydrates as they comprise of carbon, hydrogen, and oxygen at their chemical level. Carbohydrates are essential nutrients which include sugars, fibers, and starches. They are found in grains, vegetables, fruits, and in milk and other dairy products. They are the basic food groups which play an important role in a healthy life.

DRY THE ICE

SIMPLE!!

Most of the food items which we eat are obtained from plants and animals. The food grains, pulses, fruits and vegetables, all are obtained from plants. Plants also provide us different kinds of oils for cooking food like mustard oil, sunflower oil, etc. and tea, coffee, spices and sugar. Thus, plants are the major source of food materials for human beings.

Animals provide us various food materials such as milk, eggs, chicken, meat, fish and honey.  Goat, camel, cow and buffalo are milk giving animals. The hens provide us chicken and eggs. Milk is an important animal product which can be converted into other useful forms like cheese, butter, cream, curd and ghee.

Arrangement that provides a complete path for electricity to pass (current to flow) is known as electric circuit.