(a(i))[2]
Selective breeding of barley plants has raised the yield of barley. Identify the period, A, B or C, when the greatest rise in yield occurred. Explain how you chose it.
(a(ii))[2]
Using the information in Fig. 6.1, calculate the barley yield in the year 2000 in kilograms per unit area. One tonne = 1000 kg. Space for working.
(a(iii))[2]
Place the statements in the correct sequence to describe selective breeding in barley plants. Two have already been completed for you.
(a(iv))[3]
State three other ways in which humans can increase the yield of barley.
(b(i))[1]
Describe the meaning of the term monoculture.
(b(ii))[2]
State one benefit and one drawback of growing crops as monocultures.