____ aid in slowing down soil compaction from watering the plant on top of the soil by shielding the ...

____ aid in slowing down soil compaction from watering the plant on top of the soil by shielding the
  initial impact of water and dispersing the water in a wider area.

a. Amendments c. Fertilizers
  b. Mulches d. Soil softeners

a. soil softeners c. oxygenators
  b. compounds d. amendments

Field soils ability to hold water along with a higher water table could cause ____ conditions for roots,
  leading to their decline.

a. low temperature c. anaerobic
  b. high temperature d. pH balanced

Roots growing in soil cannot remain under water because they will not receive oxygen and will not
  perform ____.

a. photosynthesis c. transpiration
  b. nutrient uptake d. cation exchange

a. water tension c. cellular transfer
  b. water resistance d. cation exchange