17. Plant cells do not burst in distilled water, because

(a)  Cell wall is elastic, rigid and get stretched

(b)  Cell wall is living

(c)   Cell wall is the outer most layer of plant cell

(d)  Cell wall is permeable

Ans.  (a)           Cell wall is the outermost, rigid, protective, non living and supportive layer found in all the plant cells. It is not found in animal cells. When an animal cell placed pure water will swell up and burst, because of endosmosis.