Q24 of 27 Page 1

List the steps of preparation of temporary mount of a leaf peel to observe stomata.


1. A healthy leaf is removed from a potted plant.


2. The peel from the lower surface of the leaf was removed with the help of forceps and kept in a watch glass containing water.


3. A few drops of safranin stain were put in the watch glass.


4. After a few minutes the peel was taken out and placed onto a clean glass slide.


5. Next, a drop of glycerine was put over the peel and a clean coverslip was gently placed over it with the help of a needle.


6. Excess stain and glycerin were removed with the help of a blotting paper.


7. The slide was observed under a microscope.


More from this chapter

All 27 →
22

A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.

In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why.


 23

What is observed when a solution of sodium sulphate is added to a solution of barium chloride taken in a test tube? Write equation for the chemical reaction involved and name the type of reaction in this case.

 25

Name the process by which an amoeba reproduces. Draw the various stages of its reproduction in a proper sequence.

OR


A student is viewing under a microscope a permanent slide showing various stages of asexual reproduction by budding in yeast. Draw diagrams of what he observes.(in proper sequence)


 26

An object of height 4.0 cm is placed at a distance of 30 cm from the optical centre‘O’ of a convex lens of focal length 20 cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre ‘O’ and principal focus ‘F’ on the diagram. Also find the approximate ratio of size of the image to the size of the object.