What is the function of $RBCs$?

Justify by giving two points that cartilage is a tissue. What is its matrix made of? Where are these tissues found in our body?

Identify the tissues present in the following and give one specific feature of each:
$(i)$ Leaf stalks below epidermis.
$(ii)$ In stem,around vascular bundles.
$(iii)$ At root and shoot tip.

Give reasons for the following:
$(i)$ Cells of sclerenchyma tissue have a narrow lumen.
$(ii)$ Branches of a tree move and bend freely in high wind velocity.
$(iii)$ It is difficult to pull out the husk of coconut.

Write the location and function of collenchyma tissue.

Name the different components of xylem and draw a living component.