Tissue Worksheet-22

Tissue Worksheet-22

1. Cells of meristems divide continuously and help in increasing the length and girth of the plant.

2. The cells of meristematic tissue are similar in structure and have thick cellulose cell walls.

3. The meristematic cells are compactly arranged and do not contain any intercellular space between them.

4. According to their position in the plant, meristems are apical, lateral and intercalary.

5. Lateral meristems are situated at the growing tip of stems and roots.

6. Apical meristems are found at apices of the leaves.

7. Lateral meristems are found beneath the bark and in vascular bundles of dicot roots and stems.

8. Intercalary meristems are located at the apex of root and stem.

9. Intercalary meristems cause primary growth.

10. Permanent tissues are derived from the meristematic tissues.

11. Intercellular spaces are abundant in parenchymatous tissue.

12. The main function of collenchyma is to store and assimilate food.

13. If chloroplast is present, the parenchyma tissue is called chlorenchyma.

14. In hydrophytes (aquatic plants) such as Hydrilla, large air cavities are present in parenchyma to give buoyancy to the plants.

15. Parenchyma with air cavities is called aerenchyma.

16. Parenchyma is characterized by the deposition of extra cellulose at the corners of the cells.

17. Collenchyma is a mechanical tissue.

18. The walls of cells of sclerenchyma are greatly thickened with deposition of cellulose.

19. Sclereids also called grit cells.

20. The sclerenchyma is mainly mechanical and protective in function.

Answer:

1. True

2. False

3. True

4. True

5. False

Explanation: Apical meristems are situated at the growing tip of stems and roots

6. True

7. True

8. False

Explanation: Intercalary meristems are located at the base of leaves or internode.

9. False

Explanation: Apical meristems cause primary growth.

10. True

11. True

12. False

Explanation: The main function of parenchyma is to store and assimilate food.

13. True

14. True

15. True

16. False

Explanation: collenchymas is characterised by the deposition of extra cellulose at the corners of the cells.

17. True

18. False

Explanation: The walls of cells of sclerenchyma are greatly thickened with deposition of lignin.

19. True

20. True