(i) Dermal or Epidermal tissue system
(ii) Ground tissue system
(iii) Vascular tissue system

(i) Lead: Damages central and peripheral nervous system; affect brain development in children.
(ii) Chromium: Asthmatic Bronchitis.
(iii) Cadmium: Accumulates in kidney and liver; neural damage.

The doctor should have immediately disposed the syringe and needles without keeping it on the table. It is important for us to ensure that syringes and needles are immediately disposed after use. This is the major factor to control spread of AIDS.

S.No	Embryonic stem cells	Adult stem cell/ Somatic stem cells
(i)	They can be extracted and cultured from early embryos and are derived from inner cell mass of the blastocyst.	They are found in the newborn and adults.
(ii)	They can be developed into any cell in the body.	They have the ability to divide and give rise the specific cell types.

The device which helps in explaining the concepts easily through pictures is known as 'Visual Communication Device: For example photos, audio-visuals, drawings, animations all these can be created easily with the help of computer. Cinema is a good example for 'Visual Communication Device'.

(i)	C3H6	-	CH3CH = CH2 Propane
(ii)	C4H6	-	CH3 - CH2 - C ≡ CH 1 - Butyne CH3 - C ≡ C - CH3 2 - Butyne	Isomers

(i) This idea was developed by Oparin (1922) and Haldane (1929). They proposed that with the conditions prevailing on earth, life arose by a series of sequential chemical reactions.
(ii) The first form of life could have come from pre-existing non-living inorganic molecules which gave rise to formation of diverse organic molecules which are transformed into colloid system to produce life.
(iii) The modern concept on chemical evolution regarding origin of life was accepted.

(i) Sensory or afferent neurons
(ii) Motor or efferent neurons
(iii) Association neurons

(i) Greater the surface area, greater is the rate of the reaction
(ii) Powdered calcium carbonate offers large surface area for the reaction to occur at a faster rate.

(i) Extreme high temperature of the order of 10⁷ to 10⁹ K.
(ii) A high pressure to push the hydrogen nuclei closer to fuse with each other.

If the molecules or atoms of a gas interact with each other with a definite amount of intermolecular or inter atomic force of attraction, then, the gas is said to be real.

(i) The rays coming from the objects which are at a distance less than 25 cm are not properly a focused on retina therefore ciliary muscles cannot be contracted beyond this limit.
(ii) The focal length of the eye cannot be reduced below 25 cm.

The elasticity of a solid is higher than a liquid or a gas and so sound travels faster in solids than in liquids.

When iron is dipped in con. HNO₃ it becomes chemically passive or inert due to the formation of a layer of iron oxide (Fe₃O₄) on its surface.

(i) Addition or deletion in the number of chromosomes in a cell. This is called ploidy. It is of two types Euploidy and Aneuploidy.
(ii) Euploidy is the condition in which the individual bears more than the usual number of diploid (2n) chromosomes. If an individual has three haploid sets of chromosomes, the condition is called triploidy (3n). Triploid plants and animals are typically sterile. If it has four haploid sets of chromosomes, the condition is called tetraploidy (4n). Tetraploid plants are advantageous as they often result in addition or deletion in the number of chromosomes in a cell. This is called ploidy. It is of two types Euploidy and Aneuploidy. Euploidy is the condition in which the individual bears more than the usual number of diploid (2n) chromosomes. If an individual has three haploid sets of chromosomes, the condition is called triploidy (3n). Triploid plants and animals are typically sterile. If it has four haploid sets of chromosomes, the condition is called tetraploidy (4n). Tetraploid plants are advantageous as they often result in increased fruit and flower size reased fruit and flower size.

(i) It stimulates the ovary to develop into fruit.
(ii) It helps in development of new characters from two different individuals

(i) Human blood contains certain specific substances called agglutinogens or antigens (Ag) and agglutinins or (Ab). Antigens are found on the membrane surface of RBC.
(ii) Antibodies are present in blood plasma.
(iii) Based on the presence or absence of antigen and antibodies human blood group is classified into four groups called A, B, AB and O.

S. No	Balanced Force	Unbalanced force
(i)	If the resultant force of all the forces acting on a body is equal to zero, then the body will be in equilibrium. Such forces are called balanced forces.	If the resultant force is not equal to zero then it causes the motion of the body due to unbalanced forces.
(ii)	Eg : Force applied with a crowbar	Eg : Forces on a weight balance

If a molecule contains mote than two atoms, then it is called polyatomic molecule.

KCI_(aq) + AgNO_3(aq) ⟶ AgCl_(s) ↓+ KNO_3(aq)
white precipitate of AgCl is formed in aqueous solution of potassium nitrate.

Floods, drought, soil erosion, loss of wild life and desertification will be caused by cutting down of trees.

Hydrogen bond which binds the nucleotides in a DNA.

Gibberellin promote the production of male flowers in Cucurbits.

The characters on the background of a Scratch window are known as Sprite. Usually a cat appears as a sprite when the Scratch window is opened. The software provides facilities to make alternations in sprite.

i) They are eco-friendly.
ii) They do not cause pollution like artificial fertilizers.
iii) Help to safeguard natural resourses.

Endosperm provides food to the developing embryo.

Hind brain is formed of three parts (1) cerebellum, (2) pons and (3) medulla oblongata.

Palaeontology.

Coronary artery supply blood to the heart.

Psychotropic drugs acts on the brain and alters the behaviour, consciousness, power of thinking and perception.

i) Gas in liquid - CO₂ dissolved in water (Soda water)
ii) Solid in liquid - NaCl dissolved in water
iii) Solid in solid - Copper dissolved in gold (Alloys)
iv) Gas in gas - Mixture of Helium-oxygen gases

The Indian cattle leech.

When xylem lies towards the centre and phloem lies towards the periphery, it is called collateral vascular bundle.

Radium.

Simplest Ketone	Structural formula
Acetone

(i) Resistance is inversely proportional to area of cross section. \(\mathbf{R} \alpha \frac{l}{A}\)
(ii) A thicker wire has Iarger area of cross section and hence the resistance decreases.

Dolphins, dogs, bats can hear the ultrasonic vibrations.

(i) One mole (6.023 x 10²³ of entities) of any gas occupies 22.4 litre or 22400 ml at S.T.P.
(ii) This volume is called as molar volume of gas.

Charles's law is otherwise called as the law of volume. It states that, when the pressure of gas is kept constant, the volume of the gas is directly proportional to the temperature of the gas.
\(\mathrm{V} \propto {T}\)

(i) The red colour has longer wavelength.
(ii) So, it can travel for longer distance and will be seen clearly. So red colour is used in traffic signals.

S. No	Mass	Weight
(i)	Fundamental quantity.	Derived quantity.
(ii)	It is the amount of matter containing in a body.	It is the gravitational pull acting on the body.
(iii)	Its unit is kilogram (kg).	Its unit is newton (N).
(iv)	Remains the same.	Varies from one place to another place.
(v)	It is a scalar quantity.	It is a vector quantity.

(i) A - reddish brown metal - Copper
(ii) When copper is heated at < 1370 K in the presence of oxygen, copper forms black colour Copper (II) oxide (CuO).
(iii) \(2 \mathrm{Cu}+\mathrm{O}_{2} \stackrel{\text { below } 1370 \mathrm{~K}}{\longrightarrow} \underset{\text { (copper (Il)oxide-black) }}{2 \mathrm{CuO}}\)
(iv) When copper is heated at >1370 K in the presence of oxygen, copper forms red colour Cop-per (I) oxide \((\mathrm{Cu}_{2} \mathrm{O} )\)
(v) \(4 \mathrm{Cu}+\mathrm{O}_{2} \stackrel{\text { above } 1370 \mathrm{~K}}{\longrightarrow} \underset{\text { (copper-I-oxide-red) }}{2 \mathrm{Cu_2O}}\)
(vi) A - copper (Cu)
(vii) B - copper (II) oxide (CuO) - Black coloured
(viii) \(\mathbf{C} - copper-I-oxide \left(\mathrm{Cu}_{2} \mathbf{O}\right)-\operatorname{Red}\) coloured

(i) Pancreas is an important endocrine gland in human body, which helps in regulating the glucose level in blood by releasing an important hormone called insulin.
(ii) It also secretes digestive enzymes such as amylase.
(iii) It also secretes digestive enzymes such as amylase, lipase etc., which help to breakdown various components of food.
(iv) If pancreas will stop functioning, the person would need to administer insulin injections as well as required to take multiple digestive enzymes pills in order to help the breakdown of food.

i) When sodium chloride is dissolved in water, the process is endothermic in nature. This means that heat energy is absorbed in the process. Therefore, solubility increase with rise in the temperature. Incase of lithium carbonate, the process of dissolution is exothermic. This means that heat is evolved in the process. Therefore, its solubility in water decreases with rise in temperature.
ii) No, it cannot be used. Actually, in water the two elements are chemically combined with each other. They therefore, lose their identity. But in the mixture, no chemical combination between hydrogen and oxygen has taken place. Even water cannot be formed on mixing the gases. Therefore, the mixture does not extinguish any fire.
iii) Since the experimentally determined melting point of the solid is more than the standard value of the melting point, this means that the solid is not in pure state. It has some impurities present. Please note that the purity of a solid can be determined by finding its melting point and comparing it with the standard value.

For making element of a heating device, we use alloy instead of pure metals. The resistivity of material D lies in the range of resistivities of alloys. Therefore, material D can be used for making element of a heating device.

i) CPU - Central Processing Unit
ii) DOC - Document
iii) JPG - Joint Photographic Group (File format)
iv) PPTs - Power Point
v) MIT - Massachusetts Institute of Technology
vi) CSS - Cascading Style Sheets (Language)
vii) MP3 - MPEG Audio Layer 3 (File format)
viii) PDF - Portable Document Format (File format)
ix) DLL - Dynamic Link Library (File format)
x) PNG - Portable Network Graphics (Images)
xi) XLS - eXcel Spreadsheet (File format) 
xii) PSD - PhotoShop Document (File format)
xiii) Window OS - Windows Operating System