A = NH₄Cl,B =NH₃↑
C = HCl
D = NaHSO₄,E=H₂O

The intestinal glands secrete intestinal juice called succus entericus which contains enzymes like maltase, lactase, sucrase, lipase etc.

Elements which have the properties of both metals and non-metals are called as metalloids. (eg) Boron, Arsenic.

The path in a magnetic field in which a unit north pole tends to move when allowed to do so is known as magnetic field lines of force

It is the simplest mode of cell division and occurs in unicellular animals, aging cells and in foetal membranes. During amitosis, nucleus elongates first, and a constriction appears in it which deepens and divides the nucleus into two, followed by this cytoplasm divides resulting in the formation of two daughter cells.

Heat energy is absorbed by a solid during melting and an equal amount of heat energy is liberated by the liquid during freezing, without any temperature change. It is called latent heat of fusion.

ingestion, digestion, absorption, assimilation, egestion

Modern periodic law states that "The Chemical and Physical properties of elements are the periodic functions of their atomic number".

a. Comb gained electrons. Dry hair lost electron.
b. No. of electrons transferred = - 0.4 C
1 coulomb 6.25 x 10¹⁸ electron
- 0.4 C = 0.4 x 6.25 x 10¹⁸ electron
= - 2.5 x 10¹⁸ electrons

Greek.

Shellac or Camauba wax

To balance frictional force by centrifugal force a cyclist leans inwards, so that he can avoid skidding.

Due to the presence of two layers in the body wall of coelenterates. So they are called as diploplastic animals.

At infinity.

 Due to refraction.

Moon flower (or) Ipomoea alba shows photonasty just opposite to that of Dandelion.

1. Laws of conservation of mass:
In a chemical change the total mass of the reactant is equal to the total mass of the products.
2. Law of definite proportion:
"A pure chemical compound prepared by any method consists of the same elements combined together in the fixed proportion by mass".
3. Law of multiple proportion: 
When two elements A and B combine together to form more than one compound, then masses of A which separately combines with a fixed mass of B are in simple ratio.
4. Laws of Reciprocal proportion:
"If two elements combine separately the same weight of a third element, the ratios of the masses in which they do so are either the same or a simple multiple of the mass ratio in which they combine.
5. Gay Lussac's law of combining volumes:
Whenever gases react together, the volumes of the reacting gases as well as the products bear a simple whole number ratio, provided all the volumes are measured under similar conditions of temperature and pressure.

Separation of salt from sea water to get potable water is called desalination.

Certain soilds change directly to gas without passing through the liquid state. The direct change of a solid to gas is called sublimation.
Example: dry ice, naphthalene, iodine.

No. I cannot find the diameter of a thin wire by using the ruler.

Full form of SI system is "International system of units"