Q. 183.7( 3 Votes )

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Answer :

a. Aphids are green flies clustering round the young stems of plants.

b. They feed on plant juices.


c. An aphid has long needle like organ called ‘proboscises which it pierces in the plant tissues.


d. To make an inference, an aphid is killed while in the act of feeding and the body is removed, leaving the hollow proboscis inserted into the phloem.


e. It is found that the fluid slowly coming out from the proboscis in the form of drops.


f. These drops are then collected and analyzed.


g. The fluid is found to contain sugars and amino acids.


h. It is, therefore, inferred that food is transported in the phloem cells.



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