‹#› This system is similar to square system except one additional tree is planted in the (6.) center of each square. The plants that are planted in the centre of each square along with tall growing trees are called (7.) filler plants. These plants are planted to generate (8.) additional income . Filler plants also ensure (9.) proper utilization of land but filler trees in between may also interfere the (10.) growth of the main crop. 11. A 14. C 17. D 20. C 12. A 15. D 18. A 13. C 16. A 19. A