1. Root cap was the site of light perception.

2. From the observation of maize root cap cells, it was found that cytoplasm PD changed obviously.

3. The content of starch in root cap decreased with the increase of osmotic stress in all cultivars, and the decrement was lower in drought-resistant cultivars than that in drought-sensitive cultivars.

4. Both root and root cap are covered by a sheath - like structure called the coleorhiza.

5. If root cap was shaded when the root was irradiated, the root showed no negative phototropism' And the root lost the characteristics of negative phototropism when root cap was divested completely.

6. Conclusion:Four angles coil cable root cap attachment is a promising retainer in single side distal extension removable partial dentures.

7. They have a physiological role in the root cap and elsewhere, where the starch grains act as statoliths.

8. As soon as border cells detach from root cap periphery, their metabolic activity dramatically increases in accordance with a differential gene expression from that in root cap cells.

9. Methods The ball was placed on the root cap coping and the socket on the base of overdentures, so that we could get the retention for making use of the friction between the ball and the socket.

10. The root cap protects the growing parts of a root as the root grows through the soil.

11. The cells of the root cap of the radicle abound with chloroplast up to early stages of seed germination.

12. The other soil contrast root volume greater than the smallest and biggest phosphorus treatment, the root cap is bigger than too.

13. Gradually this tissue mass became loosened and separated from the root cap.

14. The crude toxin (filtered culture fluids) inhibited tomato seeds germination, roots growth and kill cells of the tomato root cap.

15. Outside of stele the cortical meristem developed into cortex, epidermis and the root cap subsequently.

16. The result is, high N-level can promote the root to grow, but the root cap ratio will comes down.

17. Objective: To observe the effectiveness of foursquare coil cable root cap attachment system in removable partial dentures.

18. Calyptogen A layer of meristematic cells covering the root apical meristem in some plants(e. g. grasses) that gives rise to and maintains the root cap.

19. Objective:To explore the utilization of four angles coil cable root cap attachment in single side distal extension removable partial dentures.