Q11 of 19 Page 39

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.

No, a leaf from a potted plant will not turn blue black showing that no starch is present, because the leaf did not get sunlight and it could not make fresh starch food. So, it is necessary for photosynthesis to take place so that starch can be synthesized.


More from this chapter

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9

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

 10

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.

 12

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

 13

Read the function of parts of a plant given below:

(a) fixed plant to the soil


(b) prepares starch


(c) takes part in reproduction


(d) supported branches and bears flowers


In the diagram given in Fig. 7.1 write the names of the parts whose function you have just read at the appropriate space.