Name the muscular tissue whose cells are spindle-shaped and uninucleate.

Meristematic tissues in plants are

$A$ person met with an accident in which two long bones of the hand were dislocated. Which among the following may be the possible reason?

$(a)$ 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.

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

State whether the following statement is true or false:
In aquatic plants,large air cavities are present in parenchyma to give buoyancy to the plants to help them float.