Endocrine system:
(i) Endocrine glands are present in the body produce chemical substances called hormonds.
(ii) It regulates various fundions of the body and maintains the internal environment.
Nervous system:
(i) Nervous system is well developed by neurons or nerve cells.
(ii) Nervous system along with the endocrine system doing conduction and co-ordination in human body.

We get electricity from thermal power, hydel power, tidal power wind power, solar power etc as sources of electricity
Thermal Power stations:
In thermal power stations, the thermal energy generated by burning coal, diesel or gas is used to produce steam. The steam is used to rotate the turbine. While the turbine rotates, the coil of wire kept between the electromagnet rotates. Due to electro magnetic induction electricity is produced. Here heat energy is converted into electrical energy.
Hydel power stations:
In hydel power stations, the turbine is made to rotate by the flow of water from dams to produce electricity. Here kinetic energy is converted into electrical energy. Hydel stations have long economic lives and low operating cost.
Atomic power stations:
In atomic power stations, nuclear energy is used to boil water. Here the steam is used to rotate the turbine. As a result, electricity is produced. Atomic power stations are also called as nuclear power stations. Here nuclear energy is converted into mechanical energy and then electrical energy.
Wind Mills:
In wind mills, wind energy is used to rotate the turbine to produce electricity. Here kinetic energy is converted into electrical energy.

When there is a change of position of an object with respect to time then it is called motion.
Types of motion:
a) Based on path:
i) Linear motion - a person walking on a straight path
ii) Curvilinear motion - throwing ball
iii) Circular motion - swirling stone tied to the rope
iv) Rotatory motion - a rotating top
v) Oscillatory motion - pendulum of clock
vi) Zig zag (or) Irregular motion - the motion of a bee
b) Based on duration:
i) period motion - movement of hour hand of a clock
ii) Non-periodic  - motion flapping of a flag in wind
c) Based on speed:
9) Uniform motion -  motion of a train at a constant speed
ii) Non-uniform motion - a vehicle moves in different speed

(i) The rib cage is made up of 12 pairs of curved, flat rib bones.
(ii) It protects the delicate vital organs such as heart and lungs.

(i) Germination of a seed can take more days. Because, it is a slow change.
(ii) "Changes which take place over a long period of time are known as slow changes".

Adaptations seen in different types of vertebrates are

SI.NO	NAME OFTHEANIMAL	HABITAT
1.	Fish	Lake, Sea
2.	Lizard	Land
3.	Birds	Land
4.	Camel	Desert
5.	Polar Bear	Polar region
6.	Penguin	Polar region
7.	Mountain Goat	Mountains
8.	Lion	Forest

Pure substances are mixed with harmful and unwanted substances. This process is called adulteration.

(i) Yes, a rubber ball can be called a solid because it doesn't flow away like liquids or gases.
(ii) But the rigidity of the rubber ball is less than the external force. So it changes its shape.

Eyes, Ears, Nose, Tongue and Skin are the sense organs.

K₁, K₂  should be closed.

The tail of the bird helps to change the direction of the movements.

A - Exercise;
B - Yoga;

To protect from the skin dry due to over heat.