Title: Unit 7 Quiz
Course: HRT 135 Soils and Fertilizers > Section: HRT 135 Soils and Fertilizers

Q: Soil colloids are formed as an aggregate of _____.
- organic particles of the soil
- inorganic particles of the soil
- both inorganic and organic colloids
- only clay forms colloids
A: both inorganic and organic colloids

Q: Cat ion exchange capacity of the soil means _____.
- soil particles capacity to retain water
- soil particles capacity to retain chemical elements in ionic form
- soils capacity to retain iron particles
- none of the above
A: soil particles capacity to retain chemical elements in ionic form

Q: Anions and cations are referred to as _____.
- clay and sand particles of the soil
- positively and negatively charged soil particles
- compost and humus soil particles
- soil pH range
A: positively and negatively charged soil particles

Q: Inorganic soil particles are formed from _____.
- water
- decaying plants
- decaying animals
- weathering of rocks
A: weathering of rocks

Q: Active part of the colloids are formed from _____.
- clay and organic matter
- rocks
- soil-born organisms
- subsoil particles
A: clay and organic matter

Q: The soil colloids which exhibit high cat ion capacity are formed from _____.
- organic particles
- clay particles
- both organic and clay particles
- none of the above
A: both organic and clay particles

Q: The importance of cat ion capacity of the soil is _____.
- in the availability of nutrients for the roots to take up
- that it resist leaching
- in the availability of nutrients for the roots to take up and that it resist leaching
- that roots can easily grow through colloids
A: in the availability of nutrients for the roots to take up and that it resist leaching

Q: Soil pH is important to plant growth because _____.
- it affects the growth of living organisms
- it affects decomposition of organic matter
- it affects the availability of soil nutrients
- all the above
A: all the above

Q: A soil pH of 6.5 is _____.
- very alkaline
- very acidic
- slightly acidic
- neutral
A: slightly acidic

Q: Through soil amendment _____.
- soil texture can be changed
- soil pH can be changed
- humus value of the soil can be changed
- all the above
A: all the above

Q: Define each of the following terms:

- Colloids
- Cat ion capacity
- Soil microbes
- Soil pH