Agriculture, Irrigation, Seeds, Fertilizers and other Inputs

16. Which of the following is a pest that commonly affects cotton crops?
a) Aphids
b) Fruit flies
c) Locusts
d) Nematodes

17. Which of the following is a pest that commonly affects maize crops?
a) Whiteflies
b) Thrips
c) Stem borers
d) Mealybugs

18. Which of the following is a pest control method that involves the use of natural enemies of pests?
a) Pesticide application
b) Genetic modification
c) Biological control
d) Crop rotation

19. Which of the following is a method of weed control that involves physically removing weeds from the field?
a) Herbicide application
b) Genetic modification
c) Biological control
d) Manual weeding

20. Which of the following is a genetically modified (GM) crop?
a) Organic corn
b) Conventional rice
c) Bt cotton
d) Heirloom tomato