(N/A) The internal anatomy of $C_{4}$ plant leaves is characterized by the following features:
$(1)$ $C_{4}$ plants possess a special type of leaf anatomy that allows them to tolerate higher temperatures.
$(2)$ They exhibit a positive response to high light intensities.
$(3)$ They lack the process known as photorespiration.
$(4)$ They demonstrate greater biomass productivity compared to $C_{3}$ plants.
$(5)$ In a vertical section of the leaf,two types of photosynthetic cells are observed: mesophyll cells and bundle sheath cells.
$(6)$ The particularly large cells surrounding the vascular bundles in $C_{4}$ plants are called bundle sheath cells,and this specific arrangement is known as 'Kranz' anatomy.
$(7)$ The term 'Kranz' means 'wreath' and reflects the circular arrangement of these cells around the vascular bundle.
$(8)$ The bundle sheath may consist of several layers of cells surrounding the vascular bundles.
$(9)$ These cells are characterized by a large number of chloroplasts,thick walls that are impervious to gaseous exchange,and the absence of intercellular spaces.
$(10)$ The absence of intercellular spaces in the bundle sheath prevents the leakage of $CO_{2}$ and maintains a high concentration of $CO_{2}$ for the Calvin cycle.