It is present in the phloem in the conducting tissue.
Explanation:Sieve tube, in flowering plants, stretched living cells (sieve-tube elements) of the phloem, the cores of which have divided and fragmented and the transverse end dividers of which are punctured by sieve like gatherings of pores (sieve plates)They are the channels of nourishment (generally sugar) transport. The end dividers of cells in phloem structure sieve plates, which have little gaps in them. These openings in sieve plates permit the nourishment to go along the phloem tubes Strainer tube cells are the stretched structures of the phloemThe end dividers of these plants show sifter like poresThe primary capacity of these pores is to direct the nourishment and transport them to other parts of the body
1 - a 2 - c 3 - e 4 - b 5 - d
Close to the angles of the jaw are two openings, one on each side. These are the Eustachian tubes. They are used to equalize pressure in the inner ear while the frog is swimming.
sieve tubes are found in the phloem vascular tissue.
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