Question

Bundle Sheath cells
A. Lack RuBisCO
B. Lack both RuBisCO and PEP carboxylase
C. Are rich in RuBisCO
D. Are rich in PEP Carboxylase

Answer 1

Hint: ${C_4}$ plants ate type of anatomy. In kranz anatomy, is the mesophyll and further undifferentiated as well as its cells occur in concentric layers around the vascular bundles. These vascular bundles are surrounded by large sized bundle sheath cells arranged in a wreath-like manner in one to more layers.

Complete answer:
Bundle sheath cells A thick layer of cells in plant leaves as well as the stems that forms a sheath surrounding the vascular bundles.
In ${C_4}$ plants the bundle sheath cells include chloroplasts along with the site of the Calvin cycle. The initial fixation of carbon dioxide to produce a malic acid takes place in the palisade mesophyll cells. They further involve in ${C_4}$ plants form a circle around the bundle sheath. This arrangement of bundle sheath, known as Kranz anatomy.
It also means that the products of photosynthesis process can be rapidly transferred from the bundle sheath to the adjacent phloem tissue for transport to other parts of the plant.

> Option A – Is incorrect as from the above explanation we can say that Bundles sheath cells are rich in RuBP.
> Option B – This option is not the right answer to the question as Bundles cells only lack in PEP carboxylase
> Option C – Bundle sheath cells are rich in RuBP.
> Option D – Is not the right answer as Bundles sheath cell lack PEP carboxylase.

Hence, the correct answer is option (B).

Note: In ${C_4}$ plants, bundle sheath cells are rich in RuBisCO, but lack PEP case. The $C{O_2}$ liberated in the bundle sheath cells and enters the Calvin pathway that is common to all plants. Thus, the common pathway results in the formation of sugars, the Calvin pathway is common to the ${C_3}$ as well as ${C_4}$ plants.