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(a) Draw a labelled diagram of (i) a xylem vessel, and (ii) a sieve tube (or phloem).
(b) What are the differences between the transport of materials in xylem and phloem?
(a) (i) Labelled diagram of a xylem vessel. (a) (ii) Labelled diagram of a sieve tube or phloem. (b) The differences between the transport of materials in xylem and phloem are as follows:
Transport of materials in Xylem | Transport of materials in Phloem |
1. Xylem tissues help in the transport of water and minerals from the roots are to other parts of the plant. | 1. Phloem tissues help in the transport of food from the leaves to other parts of the plant. |
2. Transports water only in one direction, i.e upwards. | 2. Transport food in both directions, upwards and downwards. |
3. Water is transported upward by transpirational pull due to evaporation of water from the leaves. | 3. Material is transported due to the difference in osmotic pressure created using energy from ATP. |
4. Transport of material takes place through vessels and tracheids which are dead tissue. | 4. Transport of material takes place through sieve tubes and companion cells which are living cells. |
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