When we read about soluble salts, we may think only of table salt, sodium chloride, but, more ...

When we read about soluble salts, we may think only of table salt, sodium chloride, but, more
  accurately, soluble salts are all types of ____ dissolved in water.

a. organic molecules c. fungi and molds
  b. microbes d. minerals

Warmer indoor environments cause soil moisture to evaporate more quickly and for plants to respire at
  higher rates, thus needing ____ than similar plants in slightly cooler indoor environments.

a. less frequent watering c. more amendments in the soil
  b. more frequent watering d. fewer amendments in the soil

a. displayed c. watered
  b. trimmed d. fed

If a soil medium is waterlogged, carbon dioxide would build up in what should be air-filled pore space,
  thus limiting respiration and resulting in the death of first, ____, then tissues.

a. root hair cells c. chlorophyll
  b. photosynthesis cells d. stomata