Why is PCT lined by Brush -bordered cuboidal epithelum?

These questions consist of two statements each,printed as Assertion and Reason.While answering these questions you are required to chose any one of the following four responses. If both Assertion and Reason are true and Reason in correct explanation of Assertion. If both assertion and Reason are true but reason is not correct explanation of Assertion. If Assertion is true but Reason is false. If both Assertion and Reason are false. Assertion:Proximal convoluted tubule is lined by brush-bordered cuboidal epitheliium. Reason:PCT is main site of selective reabsorption of useful materials from nephric filtrate.

Where is brush-bordered cuboidal epithelium located? What is its function?

Complete the missing links: Brush-bordered cuboidal eptihelial bear…………… on their free ends.

Why is urinary bladder lined by transitional epithelium?

Lung alveoli are lined by squamous epithelium. Why?

Why are viruses placed on the border line between living and non-living things?

Two cubes each with side 'b' are joined to form a cuboid. What is the surface area of this cuboid? It is 12b^2 ? Is the surface area of cuboid formed by joining three such cubes 18b^2 ? Why?

Why is it dangerous to stand on the edge of the platform near the railway line when the train is passing by?

An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not? Explain why two field lines never cross each other at any point?

A company sells biscuits. For packing purpose they are using cuboidal boxes : box A to 3cm xx 8cm xx 20cm , box B to 4cm xx 12cm xx 10 cm . What size of the box will be economical for the company? Why? Can you suggest any other size dimensions which has the same volume but is more economical than these?