Vitamins are vital nutrients, required in minute amounts to perform special functions to maintain a healthy body. It is deficiency in the food it cause many diseases.

Data processing has six steps. They are:
Data collection
Data storage
Data sorting
The data processing
Data analysis
Data presentation and conclusions

In 100g of water, the weight of hydrogen = 11.11 g
The weight of oxygen = 100 – 11.11 = 88.89 g
In 100g of sulphur dioxide, the weight of sulphur = 50 g
Weight of oxygen = 100 – 50 = 50 g
The ratio between the weight of oxygen and Hydrogen is 88.89:11.11 i.e. 8:1 .....   (1)
In hydrogen sulphide, the weight of sulphur = 94.11 g
The weight of hydrogen = 100 – 94.11 = 5.89 g
The ratio between the weight of sulphur and hydrogen is 94.11: 5.89 ie. 16: 1  ..... (2)
The two ratios 1 and 2 are related as 8/1: 16/1 (or) 1: 2
These are simple multiples of each other. The ratio between the weight of sulphur (32) and oxygen (16) which combine separately with the weight of Hydrogen (2) supports the law of reciprocal proportions

Position of image
Object distance u = − 15 cm (to the left of mirror )
Image distance v = ?
Focal length f = − 10 cm (concave mirror) Using mirror formula.
\(\frac { 1 }{ v } +\frac { 1 }{ u } =\frac { 1 }{ f } \)
\(\frac { 1 }{ v } +\frac { 1 }{ -15 } =\frac { 1 }{ -10 } \)
\(\frac { 1 }{ v } -\frac { 1 }{ 15 } =\frac { -1 }{ 10 } \)
\(\frac { 1 }{ v } =\frac { -1 }{ 10 } +\frac { 1 }{ 15 } \)
\(\frac { 1 }{ v } =\frac { -1 }{ 30 } \)
∴ Image distance v = -30cm (negative sign indicates that the image is on the left side of the mirror)
∴ Position of image is 30 cm in front of the mirror
2.Nature of image: Since the image is in front of the mirror it is real and inverted.
3.Size of image: To find the size of the image, we have to calculate the magnification
\(m=\frac { -v }{ u } \)
Object distance u = − 15cm
Image distance v = − 30 cm 
\(m=\frac { -(-30) }{ (-15) } \)
m = − 2
We know that,\(m=\frac { { h }_{ 2 } }{ { h }_{ 1 } } \)
Here, height of the object h₁ = 1 cm
-2 =\(\frac { { h }_{ 2 } }{ 1 } \)
h₂ = -2\(\times\) 1
= -2 cm
The height of image is 2 cm (negative sign shows that the image is formed below the principal axis).

The body wall is of two layers of cells namely the outer ectoderm and the inner endoderm, which is separated from each other by a non-cellular jelly-like substance called mesoglea.

(a)

b) Nature of the image is Real, inverted, magnified.

Data is the set of values of qualitative and quantitative variables. The data that is fed to the computer can be text, number or statistics. These data stored in computer memory cannot be used directly. It has to be processed.
Information The information we get or obtain or receive using the data from the computer can be used directly.

The measuring unit of the thickness of a plastic carry bag is micron.

\(speed=\frac { Distance\quad }{ Time } \)
Distance = speed × time = 346 × 5 = 1730m
Thus, the distance of location of lightning = 1730m

Concave mirror and concave lens.

Celsius = K - 273 = 300 - 273 = 27°C.

Since the particles in gases are far apart there is a lot of space between them. Therefore they can be forced to get closer or compressed when the volume decreases the pressure increases.

A standard unit is defined as a specific magnitude of a physical quantity that has been adopted by law or convention.

Height of a ball(s) =20 m
Acceleration (a)=10 m / s²
Initial velocity (u)=0
Final velocity (v)= ?
According to third equation of motion.
\(v^{2}=u^{2}+2\) as
\(=0+2 \times 10 \times 20  \)
\(v^{2} =0+400  \)
\(v =\sqrt{400}  \)
\(v =\sqrt{20 \times 20}  \)
\(v =20 \mathrm{~m} / \mathrm{s}^{2}\)
Velocity of ball strike the ground = 20 m / s²
According to first law of motion
v = u + at 
20 = 0 + (10) x t 
\(t =\frac{20}{10} \)
v =2 second 
Time taken to strike the ground = 2 second

'Photo' means 'light' and 'synthesis' means 'to build' thus photosynthesis literally means "building up with the help of light". During this process, the light energy is converted into chemical energy. Green plants are autotrophic in their mode of nutrition because they prepare their food materials through a process called photosynthesis.