While doing work and running,you move your organs like hands,legs etc. Which among the following is correct?

$(a)$ Give reasons for the following:
$(i)$ Multicellular organisms are considered more efficient.
$(ii)$ Sclerenchyma cells have a narrow lumen.
$(iii)$ Epidermis is thicker in desert plants though it is usually single layered.
$(b)$ Name the following:
$(i)$ Tissue that occurs in specific regions of growth.
$(ii)$ Tissue present at the growing tips of stems and roots.
$(iii)$ Tissue at the base of the leaves or internodes on twigs.
$(iv)$ Basic packing tissue in the form of a few layers of cells.

Name the region of the plant where meristematic tissues are usually found. Give the position and function of various types of meristematic tissue.

Why do tracheids and vessels have tubular structures?

In desert plants, the rate of water loss is reduced due to the presence of:

If the tip of a sugarcane plant is removed from the field,even then it keeps on growing in length. It is due to the presence of