State one important function of each of the following:
$(a)$ Areolar tissue
$(b)$ Cuboidal epithelium

The dead element present in the phloem is

$(a)$ 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 muscular tissue which is present in the iris of the eye. What is the shape of these cells?

Correlate the first pair of words given below and accordingly write a suitable word in the second pair.
$(i)$ Heart : Cardiac muscles : : . . . . . . : Smooth muscles.
$(ii)$ Tissue repair : Areolar : : Insulation : . . . . . .
$(iii)$ Squamous epithelium : Protection : : . . . . . . : Absorption and secretion.

Which of the following cells is found in the cartilaginous tissue of the body?