Urethra, vagina and oesophagus have a common inner lining of

Describe the location and function of the following tissues:
$(i)$ Squamous Epithelium
$(ii)$ Cuboidal Epithelium

Match the following:

Column-$I$	Column-$II$
$1$. Cuboidal epithelium	$a$. The moist surface of buccal cavity and pharynx
$2$. Columnar epithelium	$b$. Inner surface of fallopian tubes
$3$. Ciliated epithelium	$c$. In ducts of glands
$4$. Compound epithelium	$d$. Air sacs of lungs
	$e$. In the lining of stomach and intestine

Which insoluble protein is present in scales?

The nature of the mammary gland is:

Which of the following statements about cell junctions is false?
$(i)$ All the cells of the epithelium are held together with little intercellular materials.
$(ii)$ In almost all animal tissues,specialized junctions provide both structural and functional links between individual cells.
$(iii)$ Tight junctions help to stop substances from leaking across a tissue.
$(iv)$ Adhering junctions provide cementing to keep neighbouring cells together.
$(v)$ Gap junctions provide cytoplasmic channels between cells for the passage of ions,small molecules,and sometimes big molecules.