Q10 of 19 Page 39

Boojho wanted to test the presence of starch in leaves. He performed the following steps.

(1) He took a leaf and boiled it in water.


(2) He placed the leaf in a petri dish and poured some iodine over it.


He did not get the expected result. Which step did he miss? Explain.

Boojho didn’t get the result as he boiled the leaf in water instead of alcohol. Alcohol removes green colour (chlorophyll) from the leaf. It is necessary to remove green colour (chlorophyll) from the leaf because it interferers with the test of starch.


More from this chapter

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8

Solve the riddle given below :

(a) ‘’I have a green tender stem and I am much shorter than you. Who am I?’’


(b) I came out first from the seed when it is soaked in water. I provide anchorage to plants. Who am I? Write another function that I perform.

 9

Match the parts of plant given in Column I with their function in Column II

 11

Will a leaf taken from a potted plant kept in a dark room for a few days turn blue black when tested for starch? Give reasons for your answer.

 12

Can the stem of a plant be compared with a street with two-way traffic? Give reason.