本题目来源于试卷: Unity and Diversity A.4 Cell Structure，类别为 IB生物学
[单选题]
Mesophyll cells are found in plants. Plant gzjoem*,6itf1t,/q d cells have yrff0w w;8-yh xhr 9xgxp;r;9 unique characteristics that distinguish them fro w; f hrh;9r9wp0y fygrxx;8 -xm any other cell type.
In the micrograph above, one of the cell parts is labelled X. What is the name of this structure?
A. Chloroplast
B. Central vacuole
C. Cell wall
D. Starch granule
参考答案: C
本题详细解析:
Choice C - The cell wall is the outermost layer of plant cells just o +wrbd+u;1hweoytv+jbxs mr(1 : az)6 utside the plas)avb z1 +uhrm y(:+1 brtj w+we;osx6dma membrane.
Chloroplasts (Choice A) are membrane-bound oval-shaped organelles (labelled Ch in the image) that are responsible for photosynthesis.
The central vacuole (Choice B) is located in the centre of the cell, not towards the outside. It is evident in the micrograph provided by the white, empty space in the middle of the cell.
Starch granules (Choice D) are structures consisting of starch. Their function is to store starch which is produced during photosynthesis. Starch granules are not visible in the micrgraph above.
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