C: a column（柱壮物）of cells in the root apical meristem D: responsible for the absorption of water and minerals E: the central column of cells in the rootcap. 正确答案是E
3. The region of cell division in a growing root:
A: is responsible for most of the increase in length of the root. B: contains the apical meristem and nearby cells. C: contains most of the cells that are differentiating. D: contains root hairs.
E: is sharply delimited from the adjacent region. 正确答案是B
4. Root hairs arise from cells of the: A: vascular cylinder. （维管柱） B: pericycle.（中柱鞘） C: cortex D: epidermis. E: endodermis. 正确答案是D
5. In what root tissue are Casparian strips located? A: cortex B: epidermis
C: xylem and phloem D: xylem only E: phloem only 正确答案是A
6. Lateral roots arise in the: A: xylem B: epidermis. C: pericycle D: root hairs E: rootcap. 正确答案是C
7. In roots, phloem most commonly occurs: cork 正确答案是C
9. Which of the following statements about aerial roots is FALSE? A: They are adventitious （不定的）roots B: Some serve as prop（支持）roots.
C: They are produced from below ground structures.
D: If in contact with the soil they absorb water and minerals.
E: Red mangrove（红树林） and ivy（常春藤）produce aerial（气生的）roots 正确答案是C
10. Fleshy roots have an abundance of: A: xylem. B: phloem
C: parenchyma.
D: pericycle.（中柱鞘） E: endodermis 正确答案是C
Root and Plant Mineral Nutrition Part B
1. A short, upright（垂直的）, subterranean（地下的）stem covered by fleshy leaf bases is a ___. A: corm（球茎, 球根） B: bulb（鳞茎）
C: rhizome（根茎, 根状茎） D: stolon （匍匐茎） 正确答案是B
2. Roots that arise from leaves are termed ___. A: rhizomes （根茎, 根状茎） B: leaf roots
C: adve