Tissues — Science STD 9 — Question

1. Sieve tubes.
2. Companion cells.
3. Phloem parenchyma.
4. Phloem fibres.

Functions are:

1. Sieve tubes: It conduct food materials prepared in the leaves and greener young stems to all parts of plants.

2. Companion cells: It helps sieve tubes in conduction of food materials.

3. Pholem parenchyma: It helps to store food.

4. Pholem fibres: It provide mechanical strength to plants.