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Q.
Which of the following cell is enucleate at maturity ?
BHUBHU 2002
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.
(v) 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.