13. Which of the following is a herbicide used to control weeds before the crop

Question

13. Which of the following is a herbicide used to control weeds before the crop sprouts? Thiram Paraquatt Oust Round-up 14. Which of the following is a persistent pesticide? DDT b. malathion c. carbaryl d. Pirimicarb 15. Flow will the carbon dioxide content in the air in soil active with plant and animal I compare with its content in the air above the soil? a. somewhat less b. about the same c. many times greater d. a few times greater 16. Which of the following is not characteristic of a loam? a. it is a friable mixture b. its clay content excludes organic matter c. it contains sand d. it has a relatively high content of air 17. Leaching is most effective in removing which of the following from soil? a. Group IIIA salts b. transition metals c. Group IA and Group IIA salts d. aluminum and iron 18. Which of the following is not a major natural method for the removal of moister a. plant transpiration h. chemical reactions c. percolation d. surface evaporation 19. Which of the following ions is least likely to he leached from soil by natural wa a. Fe3+ b. Ca2+ c. Na+ d. Mg2+

Explanation / Answer

13) c. oust

14) a DDT

15) a somewhat less

16 ) d

17) b

18) b

19) b

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