How is the permaculture farming different from conventional chemical farming?1.Permaculture farming discourages monocultural practices but in conventional chemical farming, monoculture practices are

1. A

   1 and 3

   1 and 3. Statement 3 (permaculture hard in semi-arid; chemical easy) is the miss.

2. B

   1, 2 and 4

   1, 2 and 4. Permaculture avoids monoculture, does not salinise the way chemical farming can, and leans on mulch. It is workable in semi-arid tracts; statement 3 fails.

3. C

   4 only

   4 only. Under-counts 1 and 2.

4. D

   2 and 3

   2 and 3. Keeps the false semi-arid limb.

Summary. Official key is (b) 1, 2 and 4. Permaculture is diverse, mulch-heavy and kinder to soil than chemical monoculture. It is not barred from semi-arid land — that is the false contrast.