SCIENCE

1. To test (a) the presence of starch in the given food sample, (b) the presence of the adulterant metanil yellow in dal.

2. To prepare:

• a) a true solution of common salt, sugar and alum
• b) a suspension of soil, chalk powder and fine sand in water
• c) a colloidal solution of starch in water and egg albumin/milk in water and distinguish between these on the basis of
• transparency
• filtration criterion
• stability

3. To prepare

• a) a mixture
• b) a compound

using iron filings and sulphur powder and distinguish between these on the basis of:

• i. appearance, i.e., homogeneity and heterogeneity
• ii. behaviour towards a magnet
• iii. behaviour towards carbon disulphide as a solvent
• iv. effect of heat

4. To carry out the following reactions and classify them as physical or chemical changes:

• a. Iron with copper sulphate solution in water
• b. Burning of magnesium in air
• c. Zinc with dilute sulphuric acid
• d. Heating of copper sulphate
• e. Sodium sulphate with barium chloride in the form of their solutions in water

5. To prepare stained temporary mounts of (a) onion peel and (b) human cheek cells and to record observations and draw their labeled diagrams.

6. To identify parenchyma and sclerenchyma tissues in plants, striped muscle fibers and nerve cells in animals, from prepared slides and to draw their labeled diagrams.

7. To separate the components of a mixture of sand, common salt and ammonium chloride (or camphor) by sublimation.

8. To determine the melting point of ice and the boiling point of water.

9. To establish relationship between weight of a rectangular wooden block lying on a horizontal table and the minimum force required to just move it using a spring balance.

10. To determine the mass percentage of water imbibed by raisins.

Second Term Practicals

1. To verify the Laws of reflection of sound.

2. To determine the density of solid (denser than water) by using a spring balance and a measuring cylinder.

3. To establish the relation between the loss in weight of a solid when fully immersed in

• a. tap water
• b. strongly salty water, with the weight of water displaced by it by taking at least two different solids.

4. To observe and compare the pressure exerted by a solid iron cuboid on fine sand/ wheat flour while resting on its three different faces and to calculate the pressure exerted in the three different cases.

5. To determine the velocity of a pulse propagated through a stretched string/slinky.

6. To study the characteristic of Spirogyra/Agaricus, Moss/Fern, Pinus ( either with male or female cone) and an Angiospermic plant. Draw and give two identifying features of the groups they belong to.

7. To observe the given pictures/charts/models of earthworm, cockroach, bony fish and bird. For each organism, draw their
picture and record:

• a. one specific feature of its phylum.
• b. one adaptive feature with reference to its habitat.

8. To verify the law of conservation of mass in a chemical reaction.

9. To study the external features of root, stem, leaf and flower of monocot and dicot plants.

10. To study the life cycle of mosquito