2002 Biology Sri lankan A Level Question answer for stucture question

3 A

(i)Cytoskeleton is a three dimensional network of microtubule,microfilament,intermediate filament that is found in the cytoskeleton of a eukaryotic cell.

(ii)1.Provides shape to the cell.
    2.Helps in th emovement of the prtoplasm.
    3.Helps in the movement of the cell organelles.
    4.Helps in the arrangement of the cell organelles by providing a means of suspension of the organelles.

(iii)The three types of supporting tissues in plants are
1.Scelernchyma
2.COllenchyma
3. xylem

(iv) The supportingg material found in each of them is
1.Scelerenchyma- lignin and cellulose
2.collenchyma- cellulose and hemicellulose
3.xylem -cellulose and lignin