Introduction to Biotechnology — Science STD 9 — Question

Xylem

Phloem

(i) Consists of mostly thick-walled dead cells.

(i) Consists of mostly living cells containing cytoplasm.

(ii) The types of cells include dead cells- tracheids, vessels and xylem fibres and living cells-Xylem parenchyma.

(ii) The types of cells include living cells – Sieve tubes, companion cells, phloem parenchyma and dead cells – phloem fibres.

(iii) Structure like interconnected tubes, conduct water and minerals only in upward direction.

(iii) Tubes joined to each other, conduct sugar and amino acids from leaves to various parts in both upward and downward direction.