Can you give any two axioms from your daily life.

Give two daily life situation where you observe the diffusion (AS_1)

Give five examples of data that you can collect from your day to day life

Have you ever observed any water pollution in your area ? What measures would you suggest to control it?

You might have observed that sometimes your pet dog starts barking though no one is seen near in its surroundings or no disturbance heard nearby. Does this observation raise any doubts in your mind about the peculiar behavior of dog after your understanding about ‘range of hearing the sound’. If yes, write them. (AS_2)

Can you say that salt is a liquid on the basis of change in its shape? Justify your answer. Take a sponge. Observe its shape.

To observe the response of plant parts to light OR To study phototropism in plants. Materials : Conical flask, wire mesh, cardboard box open from one side, water, two- three freshly germinated bean seeds. Procedure : rarr Fill a conical flask with water. rarr Cover the neck of the flask with a wire mesh. rarr Keep two-three freshly germinated bean seeds on the wire mesh. rarr Take a cardboard box which is open from one side. rarr Keep the flask in the box in such a manner that the open side of the box faces light coming from a window. rarr Observe after two or three days and note down your observation. rarr Now turn the flask and leave it undisturbed in this condition for a few days and then observe. Observation : In the initial position of flask, the shoot bends towards light and roots turn away from light. rarr After turning the flask, position of shoot and roots change, i.e., shoot goes away from light and roots turn towards light but after a few days shoot again shows bending towards light and roots move away from light. What can we conclude from this activity ?

To observe the response of plant parts to light OR To study phototropism in plants. Materials : Conical flask, wire mesh, cardboard box open from one side, water, two- three freshly germinated bean seeds. Procedure : rarr Fill a conical flask with water. rarr Cover the neck of the flask with a wire mesh. rarr Keep two-three freshly germinated bean seeds on the wire mesh. rarr Take a cardboard box which is open from one side. rarr Keep the flask in the box in such a manner that the open side of the box faces light coming from a window. rarr Observe after two or three days and note down your observation. rarr Now turn the flask and leave it undisturbed in this condition for a few days and then observe. Observation : In the initial position of flask, the shoot bends towards light and roots turn away from light. rarr After turning the flask, position of shoot and roots change, i.e., shoot goes away from light and roots turn towards light but after a few days shoot again shows bending towards light and roots move away from light. Have the old parts of the shoot and root changed direction ?

To observe the response of plant parts to light OR To study phototropism in plants. Materials : Conical flask, wire mesh, cardboard box open from one side, water, two- three freshly germinated bean seeds. Procedure : rarr Fill a conical flask with water. rarr Cover the neck of the flask with a wire mesh. rarr Keep two-three freshly germinated bean seeds on the wire mesh. rarr Take a cardboard box which is open from one side. rarr Keep the flask in the box in such a manner that the open side of the box faces light coming from a window. rarr Observe after two or three days and note down your observation. rarr Now turn the flask and leave it undisturbed in this condition for a few days and then observe. Observation : In the initial position of flask, the shoot bends towards light and roots turn away from light. rarr After turning the flask, position of shoot and roots change, i.e., shoot goes away from light and roots turn towards light but after a few days shoot again shows bending towards light and roots move away from light. Are there differences in the direction of the new growth ?

Take an empty bottle of the sort in which bottled water is sold. Pour about 5-10 mL of water into it and close the bottle tightly. Shake it well or leave it out in the sun for ten minutes. This causes the air in the bottle to be saturated with water vapour. Now, take a lighted incense stick. Open the cap of the bottle and allow some of the smoke from the incense sticks to enter the bottle. Quickly close the bottle once more. Make sure that the cap is fitting tightly. Press the bottle hard between your hands and crush it as much as possible. Wait for a few seconds and release the bottle. Again press the bottle as hard as you can. Now answer the following questions : When did you observe that the air inside seemed to become 'foggy'?