Question

A plant has to produce carbohydrates because ?

A carbohydrates are needed to move ATP from cell to cell.

B carbohydrates are needed for building material.

C carbohydrates store the genetic material within the cells.

D carbohydrates store energy for a long time

Answer 1

Hm this is a tough one.

You can eliminate A and C - the former because that's likely the job of an enzyme, the latter because we know that's the job of the nucleic acids.

However, B and D are both pretty legit answers, in my opinion. You have cellulose, widely used by plants as a building material, which is a polysaccharide (so B's correct). You also have starch, another polysaccharide, stored in amyloplasts to provide the plant with energy (so D's correct). You could make a pretty good argument for either one of those choices.