ONION PEEL EPITHELIUM

1)Smita took an onion peel and noted the characteristics. Which one is correct?

• Uninucleated cells

• No intercellular spaces

• Cell wall is present

• All of these

2)The pink color in the onion peel cells as seen under microscope, may be due to the following stain:

• Iodine

• Acetocarmine

• Safranine

• methylene Blue

3)To observe cells in an onion peel, we must prepare the slide by mounting on it :

• Crushed pulp of onion

• Dry scale leaf

• Green leaf of an onion

• Thin transparent peel from the inner side of onion

4)On observing onion peel slide under low power of compound microscope which set of structures are clearly seen :

• Cell wall, cell membrane ,nucleus ,cytoplasm

• Nucleus ,cell membrane ,vacuole, chromosomes

• Cell wall ,cell membrane ,mitochondria, vacuole

• Cell wall, nucleus ,vacuole ,chromosomes

5)The temporary mount of onion peel's cell is mounted in glycerin because:

a) Its stains the material

b) Prevents drying the material

c) Provide support to cells

d) Both (a) and (b)

• A

• B

• C

• D

6)During observation of an onion peel, cells are first seen under

a. high power b. low power

c. medium power d. none of the above

• A

• B

• C

• D

7)In the preparation of temporary mount of onion peel which of the following is not used :

• water

• Glycerine

• safranin

• alcohol

8)We generally mount the material on slide

• on left side of slide

• on right side of slide

• in the center

• both (a) and (b)

9)Which one of the following is the correct sequence for preparing a mount of onion peel

• . (i) take out onion peel (ii) keep the peel on the slide (iii) add a few drop of glycerine on it (iv) add few drops of safranin stain (v) cover it up with a coverslip

• (i) take out onion peel (ii) keep the peel in water in a petridish (iii) add a few drops of safranin stain and transfer to a slide (iv) add a drop of glycerine (v) cover it up with a coverslip

• (i) take out onion peel (ii) Keep it on a slide and add safranin stain (iii) transfer it to water in a petridish (iv) remove water and add glycerine (v) cover it up with a coverslip

• (i) take out onion peel (ii) cover it up with a coverslip (iii) on a petridish, add water to clean (iv) add a drop of glycerine (v) add a few drops of safranin stain

10)You are viewing a prepared slide of temporary mount of cells under high magnification microscope. You would observe

• More number of cells

• large size, Less number of cells

• large size, Less number of cells, small size

• More number of cells, large cells