activity

Draw a scalene triangle, an acute angled triangle, an obtuse angled triangle, an equilateral triangle and a right angled triangle. Measure the angles in all the figure. Enter the measure in the table given. What do you observe? What do you conclude with respect to the sum of the magnitudes of all ..

Take a thin layer of tissue from the lower surface of the leaf. Mount it on a slide in water and examine under a microscope. You will find tiny pores or stomata along with the epidermal cells. The stomata are bound by a pair of guard cells whose concave sides face each other. It is through the stom..

If the above activity is repeated with another wire or a torch bulb, the current values are found to be different in each case. This shows that the current through the circuit is not decided by the battery but by the component through which it passes. Some materials allow larger current t..

Take 3 pots with soil. Place an entire leaf of Bryophyllum in one pot, a piece of a leaf in another pot and an injured leaf in another pot. Observe the conditions under which the propagation occurs. Other examples are Begonia, Kalanchoe Streptocarpus and Saintpauli..

In a transparent combustion tube, cotton wool dipped in concentrated hydrochloric acid and liquor ammonia is introduced separately from the two ends of the tube. Both the ends of the combustion tube are then closed with rubber stoppers (Fig.5.6)...

Sodium chloride is taken in a round bottomed flask, and concentrated sulphuric acid is added to the flask through the thistle funnel. Then the flask is heated. The hydrogen chloride gas formed is collected by the upward displacement of air. To obtain dry hydrogen chloride gas, it is passed through..

Set the apparatus as shown in figure 6.8. The platinum coil is heated at 800 o C in a combustion tube till it becomes white hot. Then ammonia and oxygen are passed through the tube. Under these conditions and in the presence of the catalyst, ammonia combines with free oxygen or oxygen of the a..

Take two glass jars A and B. Collect sulphur dioxide gas in jar B and let jar A contain air. Carefully invert jar B containing sulphur dioxide, over the jar A containing air. Keep it for a few minutes (Fig. 7.3). Remove jar B and put a filter paper strip dipped in acidified potassium dichromat..