Merits of five kingdom:
i) This system of classification is more scientific and natural.
ii) This system of classification clearly indicates the cellular organisation, mode of nutrition and characters for early evolution of life.

The levels of classification are 
1. kingdom
2. phylum
3. classes
4. order
5. families
6. genus and
7. species

Cells are the basic structural and functional unit of living organism. It can seen only under a microscope. Inside the cell many tiny particles called cell organelles. These organelles are responsible for providing needs of the cell. Cell membrane is a protector. Mitochondria is a powerhouse of the cell. In plants chloroplast is a food producers. Lysosomes are digestive componenets of the cell, Endoplasmic reticulum synthesise protein, Iipid and steroids. Nucleus is the brain of the cell.

Cell, tissue, organ, organ system, organism

Smooth ER and Rough ER

Cell wall and Cell membrane

Chloroplast and Mitochondria

\(\begin{array}{|l|l|} \hline {\text { Dissolution of sugar }} & \text { Burning of sugar } \\ \hline \text { It forms a solution } & \text { It forms ash. } \\ \hline \text { It is a physical change } & \text { Chemical properties changed } \\ \hline \text { It will be reversible } & \text { It is irreversible } \\ \hline \text { No heat changed } & \text { Heat released } \\ \hline \end{array}\)

Yes, Desalination is a process to remove the salt from the sea water. After desalinating process we will collect water from sea.

i) Temperature variation can change the substance.
ii) Every substance has a melting point. It attain the melting temperature substance can change.

\(\begin{array}{|c|l|l|} \hline \text { S.No. } &{\text { Physical change }} &{\text { Chemical change }} \\ \hline \text { 1. } & \text { No new substance are formed } & \text { New substance are formed } \\ \hline 2 . & \text { Chemical properties do not change } & \text { Chemical properties changed } \\ \hline 3 . & \text { It is a temporary action. } & \text { It is a permanent action. } \\ \hline 4 . & \text { It is a reversible reaction } & \text { It is a irreversible reaction. } \\ \hline \end{array}\)

Electrical conductivity is the measure of a material's ability to conduct an electric current. It is commonly represented by the Greek letter σ(sigma). The S.I Unit of electrical conductivity is Siemens/meter(S/m).

No. Srinath is not suffering from fever. No person always has exactly the same temperature at every moment of the day. Temperature cycle regularly up and down through the day according to activities and external factors.

Yes, Ramani's statement is correct. I agree Ramani statement. because laboratory thermometer has no kink. When thermometer is taken out from the hot water, the mercury level will fall. We can't measure the correct temperature.