What does diploid mean? what types of cells are diploid? what is the diploid number for humans?

Diploid means the cell has the total number of chromosomes. In a human, this would be 46. A normal body cell is diploid, compared to a haploid cell which is only in sex cells, like the sperm or the egg.

just go with your heart buddy

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.