C: Parenchyma D: Phloem

E: Sclerenchyma 正确答案是E

5. Annular annular（环形的, 有环纹的）and helical（螺旋状的）thickenings in secondary cell walls are characteristic of: A: tracheids only.

B: vessel elements only C: sieve elements only.

D: both tracheids and vessel elements.

E: tracheids, vessel elements, and sieve elements. 正确答案是D

6. A mature sieve element does NOT normally have: A: a nucleus

B: a plasma membrane

C: smooth endoplasmic reticulum.（内质网） D: plastids.

E: mitochondria.（线粒体） 正确答案是A

7. The function of companion cells is thought to be: A: structural support. B: storage of starch

C: delivery of substances to sieve-tube elements

D: conduction of food from one part of the plant to another. E: transport of water and minerals 正确答案是C

8. Trichomes（藻丝） are:

A: a. cells associated with guard cells.

B: cells that form the bulk（大多数）of the epidermis.

C: waxy（蜡质的）deposits（堆积物, 沉淀物）on the epidermis. D: appendages（附属物）of epidermal cells. E: the cell walls of epidermal cells. 正确答案是D

9. The cuticle of the epidermis consists mainly of: A: cellulose and fats.

B: cutin and wax.（蜡状物） C: cellulose and cutin（角质） D: cellulose and wax.

E: lignin（木质素）and wax 正确答案是B

10. Which of the following is NOT a component of the periderm? A: phellem（木栓） B: epidermal tissue

C: phelloderm（栓内层）

D: cork cambium E: cork

正确答案是B

Plant Cells and Tissues Part B

1. The tissue found between the endodermis and the epidermis of plants is called the ___. A: xylem B: phloem

C vascular cambium D: cortex

正确答案是D

2. The food storage tissue of the root is the ___. A: cortex

B: endodermis C: xylem D: phloem 正确答案是A

3. The cell type providing the greatest structural strength to plants is the ___. A: fiber cell

B: collenchyma cell C: parenchyma cell D: sieve cell 正确答案是A

4. The cell type associated primarily with plant differentiation and growth is the ___. A: xylem cell

B: meristematic（分生组织的）cell C: phloem cell D: epidermal cell 正确答案是B

5. Which organelle（细胞器官）is associated with protein synthesis in plants? A: mitochondrion

B: Golgi body (dictyosome) C: ribosome

D: protocytoplasmic body 正确答案是C

6. Which structure is least related to the others? A: plastid B: nucleus C: cell wall

D: mitochondrion 正确答案是C

7. The organelle that captures（俘获, 捕获）light energy is the ___. A: mitochondrion B: chloroplast C: nucleus

D: leucoplast（白色体） 正确答案是B

8. Ribosomes are associated with the ___. A: rough endoplasmic reticulum （内质网） B: smooth endoplasmic reticulum C: nucleus

D: vacuole（液泡） 正确答案是A

9. Cell support is provided by the ___. A: skeleton（骨架）

B: fluid（流动的） matrix （基质） C: cytoskeleton

D: exoskeleton（外骨骼） 正确答案是C

10. Movement of hydrogen ions [H+] across a plant membrane requires no ATP. A: True B: False

正确答案是B

11. Membranes facilitate（使容易,促进） cell-to-cell communication. A: True B: False

正确答案是A

12. The movement of ions from a region of high concentration to a region of lower concentration is known as osmosis. （.渗透作用） A: True B: False

正确答案是B

13. Axillary（叶腋的, 腋生的）buds（芽）are associated with the tip of a shoot.（嫩芽） A: True B: False

正确答案是B

14. The cell type that is alive at maturity and involved（与…有关的） with food storage and/or photosynthesis is parenchyma. A: True B: False

正确答案是A

15. An example of an undifferentiated plant tissue would be the procambium.（原形成层） A: True B: False

正确答案是A

16. A trichome（毛状体） is an extension（.扩充）of an epidermal cell. A: True B: False

正确答案是A

17. An apical meristem can be found in an axillary bud.（腋芽） A: True B: False

正确答案是A

Plant Cells and Tissues Part C

1. The helical（螺旋状的）structure of a DNA molecule（分子） can be viewed with a stereomicroscope.（立体显微镜） A: True B: False

正确答案是B

2. In plant cells, the secondary wall is deposited （堆积）to the inside of the primary wall. A: True B: False

正确答案是A

3. Cytoplasmic（细胞质的） streaming（

流动） is the process whereby（为何）organelles move in a current（趋势,）within the cytosol.（细胞溶质,胞液） A: True B: False

正确答案是A 4. Vacuoles（液泡） are membrane-bound, empty air spaces, which make up to 90% or more of the cell's volume. A: True B: False

正确答案是B

5. In higher plants, mitosis occurs in the vascular cambium and the meristems. A: True B: False

正确答案是A

6. During anaphase (细胞分裂的后期), the vesicles（小泡） of the phragmoplast（成膜体）fuse（融合）into a flattened（平的）hollow cell plate. A: True B: False

正确答案是B

7. The endoplasmic reticulum（内质网） is a system of flattened sacs（囊）and tubes（管子）associated with the storage and transport of proteins. A: True B: False

正确答案是A

8. The cytoplasm of a cell consists of A: the cytosol（细胞液）and organelles. B: only salts

C: cell fragments（碎片）

D: the plasma membrane and cell wall