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Difference between sieve cells and tubes:
Sieve cells | Sieve tubes |
| Sieve cells there is no companion cells. | In sieve tubes always there will be companion cells. |
Sieve plates are not formed in sieve areas. | In Sieve tubes, sieve plates act as boundaries to sieve areas. |
Sieve cells are elongated and are unique long. Walls are with tapered ends. | Cells containing vertical cells placed one above the other form long tubes. These Long tubes are connected at the walls by means of sieve pores. |
| Sieve cells consists of sieve pores smaller in size and are larger in number. | Sieve tubes consists of sieve pores larger in size and are smaller in number |
Pteridophytes and gymnosperms consists of sieve cells. | Angiosperms consists of sieve tubes. |
Differences between Tracheid's and Vessels:
Tracheid | Vessels |
Tracheid are formed from single cells | Vessels are made up of number of cells |
Ends of the tracheid are oblique and taper | Ends of the vessels are round and transverse |
Length of the tracheid is of fraction of a centimetre in length. | Vessels are several centimetres in length |
Tracheid walls are thick. | Vessels walls are less thick. |
Lumen is narrow | Lumen is wider |
Differences between Xylem and Phloem:
Xylem | Phloem |
Xylem conducts minerals and water. | Phloem conducts food and organic solutes. |
Xylem conducts in one way i.e., unidirectional conduction from roots to apical parts (tips of the plant ) of the plant. | Phloem conducts in two ways. i.e., bidirectional conduction of food from leaves to storage organs. And also from storage organs to growing parts of the plant. |
Channels that helps xylem for conduction are tracheid and vessels. | Channels that helps phloem for conduction are sieve tubes. |
Xylem consists of the components such as tracheid, vessels, xylem parenchyma and xylem fibres. | Phloem consists of the components such as sieve elements, companion cells, phloem parenchyma and phloem fibres. |
Lumen is narrow. | Lumen is wider. |
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