Take two similar green leaves . Apply grease on one leaf and leave the other free. Add 1 or 2 drops of acid on each leaf . What kind of change do you observe from this ?

Leave the mixture undisturbed for sometime. What changes do you observe? Does the solute settle down after some time?

Observe the following decimals 1/2 = 0.5, 1/10 = 0.1, 32/5. = 6.4, 1/3= 0.333... 4/15 =0.2bar66 can you tell the special charecter of denominator which makes the fraction as terminating or non-terminating recurring decimals ? Write prime factors of denominator of each rational no. What did you observe from the results ?

What did you observe in acid and leaf experiment ? What did you have understand regarding human digestive system from this?

Refer to the Activity 3 in the chapter. Start with distilled water. The LED would not glow. Add two drops of some acid to distilled water and check the glow of LED. Add two more drops and check the intensity of the glow. Repeat the activity 5 to 6 times by adding 2 drops of the same acid each time. Do you see any difference in the intensity of glow with increasing acid content of water? What can be inferred from the above observations? Repeat the entire activity by taking a solution of baking soda and adding drops of it to distilled water instead of acid. Write differences and similarities. (AS_(3),AS_(1))

Take two paper cups.Fill them with fertile soil.sow two or three bean seeds in a cup and few finger millets in another cup.Sprinkle water over them.then place them by the window.After a couple of days you will see them sprout observe the newly emerging leaves. What kind of root system do you find in the millet plant?

Take two paper cups.Fill them with fertile soil.sow two or three bean seeds in a cup and few finger millets in another cup.Sprinkle water over them.then place them by the window.After a couple of days you will see them sprout observe the newly emerging leaves. What kind of root system do you find in the bean plant?

Collect water samples from a pond, well, bore well.Keep then separately. Put a drop of water on a slide. Keep a cover-slip, on it. Observe. under the microscope. What kind of microorganisms do you find in the water from a pond and borewell?