The girth of the stem or root increases due to

Match the column $(A)$ with the column $(B)$:

Column $(A)$	Column $(B)$
$(a)$ Parenchyma	$(i)$ Thin walled,packing cells
$(b)$ Photosynthesis	$(ii)$ Carbon fixation
$(c)$ Aerenchyma	$(iii)$ Localized thickenings
$(d)$ Collenchyma	$(iv)$ Buoyancy
$(e)$ Permanent tissue	$(v)$ Sclerenchyma

$A$ person met with an accident in which two long bones of the hand were dislocated. Which among the following may be the possible reason?

Parenchyma cells are

Fill in the blanks:
$(a)$ Cork cells possess ........... on their walls that make them impervious to gases and water.
$(b)$ .................. have tubular cells with perforated walls and are living in nature.
$(c)$ Bone possesses a hard matrix composed of ............... and ............. .

Nerve cell does not contain