A) collencnyma
B) phloem cells
C) ray parenchyma only
D) ray parenchyma and xylem cells
Correct Answer: D
Solution :
Tyioses are balloon like structures develop from xylem parenchyma. These tyioses block the passage of xylem vessels and ray parenchyma. So also called as tracheal plug. These tyloses block the continuity and flow of water which leads to death of elements of heart woods. Collenchyma is a simple permanent tissue, which is made up of isodiametric or elongated living cells having unevenly thickened pectoceilulosic non-lignified primary walls. Il works as living mechanical tissue. This tissue ii found in hypodermis of dicot stems and petioles. Phloem cells : Phloem is a complex permanent vascular tissue, which conducts organic food in the plant body. It has four types of phloem cells ie, sieve tubes, companion cells, phloem parenchyma and phloem fibres.
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