Study specimens G (GOAT WEED), H (SIDA WEED), I (SPEAR GRASS), J (ELEPHANT GRASS), and K (PIG WEED) carefully and answer the following questions.

(a) State the botanical names of each of specimens G,H, I, J, and K.

(b) Give one reason why each of specimens 1, J, and K is difficult to control.

(c) Mention two uses of specimen J.

(d) State five ways in which specimens G, H, I, J, and K are of economic importance to farmers.