Name the element$(s)$ of xylem which
$(i)$ help in transport of water and minerals,
(ii) stores food,and
(iii) provides mechanical support.

Find out the incorrect sentence.

Which structure protects the plant body against the invasion of parasites?

What are stomata?

$(a)$ 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.

Girth of stem increases due to