Answer:

1. Hand cultivator - One possible defect of a hand cultivator is that the tines may bend or break with repeated use or if excessive force is applied. To maintain the tool, the tines should be inspected regularly for damage and replaced if necessary. The tool should also be cleaned after each use to prevent rust and corrosion.

2. Sickle - A defect of a sickle could be that the blade may become dull with use, making it less effective in cutting through vegetation. To maintain the tool, the blade should be sharpened regularly using a sharpening stone or file. The blade should also be cleaned after each use to prevent rust and corrosion.

3. Pick-mattock - A defect of a pick-mattock could be that the point or blade may become dull or damaged with use, making it less effective in breaking up soil or rocks. To maintain the tool, the blade or point should be sharpened regularly using a sharpening stone or file. The tool should also be cleaned after each use to prevent rust and corrosion.

4. Shovel - A defect of a shovel could be that the handle may break or splinter with repeated use or if excessive force is applied. To maintain the tool, the handle should be inspected regularly for damage and replaced if necessary. The blade of the shovel should also be cleaned after each use to prevent rust and corrosion.

5. Hand trowel - A defect of a hand trowel could be that the blade may become dull or bent with use, making it less effective in digging or planting. To maintain the tool, the blade should be sharpened regularly using a sharpening stone or file. The tool should also be cleaned after each use to prevent rust and corrosion.

6. Spading fork - A defect of a spading fork could be that the tines may become bent or damaged with repeated use or if excessive force is applied. To maintain the tool, the tines should be inspected regularly for damage and replaced if necessary. The tool should also be cleaned after each use to prevent rust and corrosion.

7. Bolo - A defect of a bolo could be that the blade may become dull or damaged with use, making it less effective in cutting through vegetation. To maintain the tool, the blade should be sharpened regularly using a sharpening stone or file. The blade should also be cleaned after each use to prevent rust and corrosion.

8. Knife - A defect of a knife could be that the blade may become dull or damaged with use, making it less effective in cutting. To maintain the tool, the blade should be sharpened regularly using a sharpening stone or file. The blade should also be cleaned after each use to prevent rust and corrosion.

9. Pruning shears - A defect of pruning shears could be that the blades may become dull or misaligned with use, making them less effective in cutting branches cleanly. To maintain the tool, the blades should be sharpened regularly and oiled to keep them moving smoothly. The tool should also be cleaned after each use to prevent rust and corrosion.

10. Wheelbarrow - A defect of a wheelbarrow could be that the tire may become flat or damaged with use, making it difficult to move heavy loads. To maintain the tool, the tire should be inspected regularly for damage and replaced if necessary. The tool should also be stored in a dry place to prevent rust and corrosion.

11. Hand fork - A defect of a hand fork could be that the tines may become bent or damaged with repeated use or if excessive force is applied. To maintain the tool, the tines should be inspected regularly for damage and replaced if necessary. The tool should also be cleaned after each use to prevent rust and corrosion.