A first-aid manual suggests that vinergar should be used to treat wasp stings and baking soda for bee stings.
What does this information tell you about the chemical nature of:
(a). Wasp stings?
(b). Bee stings?

A first aid manusl suggests that vinegar should be used to treat wasp stings and aking soda for bee stings.
(i) What dows this information tell you about the chemical nature of the wasp stings ?
(ii) If there were no baking soda in the house, what other household substance could you use to treat bee stings

_________ solution is used to treat bee sting .

Why is a basic substance used to treat a honey bee sting?

Shivani is a of class X. She lives in a big house on the outskirts of Delhi. Her family has a kitchen garden at the back of the house in which various types of seasonal vegetables are grown. Shivani's parents have been getting good crops of vegetables for many years. But from last year, the yield of vegetables from the kitchen garden has reduced a lot. Shivani asken the gardener if he was putting any chemical fertiliser into the soil or not. The gardener told Shivani that he was putting a lot of ammonium sulphate fertiliser into the soil every time before sowing the fresh crop of vegetables and he has been doing this for any years to increase the yield of vegetables more and more. Shivani could now understand the problem. She then asked the gardener to mix a cerain substance with the soil uniformly before growing the next crop of vegetables. the gardener did the same. every one was happy to see that there was bumper crop of vegetables this time.
(a) What had happened to the soil in the kitchen garden over the years? Why?
(b) Shivani took a little of soil from the kitchen garden stirred it with some water in a test tube, filtered it and tested and filtrate with universal indicator. The universal indicator. The universal indicator turned orange. What does this tell us about the nature of soil?
(c) Why did the yield of vegetables in the kitchen garden reduce a lot?
(d) What substance/ substances do you think Shivani asked the gardener to put in the soil of kitchen garden?
(e) How did the addition of above substance/substances help the soil?
(f) What values are displayed by Shivani in this episode?

(a). Why is it wrong the treat a bee sting with vinergar?
(b). Why is it wrong to treat a wasp sting with baking soda solution?

(a). What happens during a bee sting? What is its remedy?
(b). What happens during a wasp sting? What is its remedy?

Reshma is the student of class X in a city school. One day she was sitting in the school garden with her friends during the recess. There was a tall tree at the edge of the garden having a large honeycomb attached to it. Some students were playing cricket in te school playground. Suddenly the cricket ball hit the honeycomb due to which a large numbr of honey-bees started flying here and there. Reshma was stung on her face by a honey-bee. The sting was so painful that Reshma started crying. She was immediately rushed to the science laboratory. One of her classmates Shanta gave her vinegar solution to rub on the stung area to get relief from pain. Another clasmate Amarjit, howerver, asked Reshma to rub baking soda solution on the stung area of face. On rubbing baking soda solution, Reshma felt a lot of relief from pain.
(a) What kind of liquid is injected into the skin when a honey-bee stings a person?
(b) Why did rubbing baking soda solution on the stung area of skin give relief from pain?
(c) What type of chemical reaction takes place when baking soda solution is rubbed on the honey-bee sting area?
(d) Why do you think rubbing the honey-bee sting area with vinegar could not give relief from pain?
(e) Name one plant whose stinging hair on leaves inject a similar liquid to that injected by honey-bee sting and can be treated by rubbing baking soda solution?
(f) What vaues are displayed by Amarjit in this episode?

Bunty is a ten year old by who was playing in the park with other friends. Suddenly a wasp came flying and stung him on the face. Bunty felt a lot of pain and came running home . Just then, Bunty's younger sister Arti, who is just five five years old was stung by an ant an on the arm causing a lot of burning pain. She also came running home Bunty's elder sister Reema who is a student of class $X$ was at home at that time. Reema immediately took vinegar bottle from the kitchen shelf and rubbed some vinegar on the stung area of skin on Bunty's face. This gave Bunty some relief. Reema than took baking soda container from the kitchen made a solution of baking soda in water, and rubbed this baking soda solution on the stung area of Arti's arm. She also got relief from pain.
(a) What type of liquid was injected by wasp's sting into Bunty's skin?
(b) Why did rubing vinegar on the stung area of skin reduce Bunty's pain?
(c) Which chemical is injected by an ant's ting into Arti's skin?
(d) Why did rubbing baking soda solution on stung area of skin reduce Arti's pain?
(e) Name a plant whose stinging leaf hair inject the same chemical into the skin of a person (who touches it) as the anty's sting.
(f) What type of chemical reaction takes place:
(i) When vinegar is rubbed on Bunty's skin having wasp sting?
(ii) When baking soda solution is rubbed on Arti's arm having ant's sting?
(g) What values are displayed by Reema in this whole episode?

(a) A box of weight $10\sqrt{3}$ N is held n equilibrium with the help of two strings OA and OB as shown in figure-1. the string OA is horizontal. Find the tensions in both the stings.

(b) If you can change location of the point A on the wall and hence the orientation of the string OA without altering the orientation of the string OB as shown in figure-II. what angle should the string OA make with the wall so that a minimum tension is developed in it?

When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
What could particles X be ?
(b) What do you think liquid Y is ?
(c ) What is zig-zag movement of X known as ?
(d) What is causing the zig-zag movement of particles X ?
(e) Name the scientist who discovered this phenomenon.
(f) What does this experiment tell us about the nature of liquid Y ?