1.
Soil, air, water, sunshine
2.
1. The World Health Organization (WHO) is a specialized agency of the United Nations that is concerned with international public health. 2. Red Cross Society (RCS) is a voluntary international humanitarian organisation to protect human life and health. 3. The United Nations Children's Fund or UNICEF is an international organization. All of them provides medicine to affected people during calamities.
3.
1. Plants need soil to grow. Soil provides support, water and minerals to them. 2. Many animals and insects have shelter in soil. eg. rabbits, ants, earthworms.
4.
Option B
5.
1. Afforestation- increases rainfall reduces drought. 2. Water harvesting- increases underground water level. This helps in drought.
6.
1. Government has set up wildlife sanctuaries, national park for animals where hunting is not allowed. 2. Afforestation is planting trees. 3. Vehicles with catalytic converters to reduce pollution 4. Rainwater harvesting to increase level of ground water.
7.
1. Heart diseases such as coronary artery disease 2. lung diseases such as asthma
8.
From the surface upward, the layers in Earth’s atmosphere are: 1.troposphere which controls weather on earth, 2. stratosphere is the ozone layer, 3. mesosphere the top of the greenhouse where CO2 radiates energy to space and 4. thermosphere which is so thin it is easily heated by sunlight.
9.
Option A
10.
Option A
11.
Option C
12.
Everything surrounding us and affecting us is called as environment.
13.
Option B
14.
Earth has got thin layer of invisible gas as a outer part. This layer protects earth from harmful radiations from sun. Chemicals due to pollution has thinned this layer. At some places like north pole, it has created a hole. This is called as ozone hole.
15.
Option A
16.
1. heavy rains during monsoon 2. collapse of dam built over a river 3. cyclones 4. tidal waves
17.
1. Air has oxygen which is required by all living things to breathe. 2. Plant needs carbon dioxide, present in air to prepare food.
18.
Option B
19.
Option C
20.
An event which causes damage to human and properties in large scale. eg drought, flood, cyclone
