A) Sieve tube
B) Xylem
C) Tracheids
D) Fibre
Correct Answer: A
Solution :
Phloem is a complex permanent vascular tissue which conducts organic food in plant body. It is composed of following structures : (i)Sieve tube: They are conducting element of phloem. These tubes are formed by joining sieve tube cells. Sieve tube cells becomes enucleated at maturity. (ii)Companion cells : They are thin-walled elongated cells which are connected with sieve tube cells and controls metabolic activities of sieve tube cells. (iii)Phloem paranchyma : It takes part in storage as well as slow lateral conduction of food. (iv) Phloem fibres : They are sclerenchyma fibres that occurs in sheets or cylinders. Xylem is a complex permanent tissue which conducts sap or water. It also provides mechanical strength. Xylem is made up of four types of cells i.e., tracheids, vessels, xylem fibres and xylem paranchyma.
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