$A$ tall tree has many branches. Which tissue helps in the lateral conduction of water in these branches?

$(a)$ 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.

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.

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

State whether the following statement is true or false:
The cells of collenchyma are living,elongated,and irregularly thickened at the corners.

Why do tracheids and vessels have tubular structures?