题目
题目
单项选择题

Which of the following cells or tissues is/are NOT commonly present in pines?

选项
A.a. tracheids
B.b. vessel elements
C.c. hypodermis
D.d. endodermis
E.e. Pines have all of the above.
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标准答案
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思路分析
Examining the question about which cells or tissues are NOT commonly present in pines, we should evaluate each listed option in turn. Option a: tracheids. In gymnosperms like pines, the primary water-conducting cells in xylem are indeed tracheids. They are long, narrow cells with thick lignified walls and pits, serving both support and water transport. Therefore, tracheids are commonly present in pines. Option b......Login to view full explanation

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