1. Which of these statements about a 1:1 non-expanding silicate clay mineral is

Question

1. Which of these statements about a 1:1 non-expanding silicate clay mineral is correct?

a. it contains a chain of one tetrahedral and one octahedral

b. the lattice is fixed

c. no expansion because of the strong bond

d. it has low CEC because of overall smaller surface area

e. a, b, c, d and e

2. In a 2:1 non-expanding silicate clay one layer of octahedral is sandwiched between two layers of tetrahedral that from expanding lattice.

True

False=

3. The following are examples of acidifying processes that produce hydrogen ions (H^+) except

a. addition of calcium and lime to the soils

b. addition of carbonic and other organic acids to soils

c. accumulation of organic matter in the soils

d. Oxidation of nitrogen( nitrification) in the soils

e. plant uptake of cations

4. Excessive rainfall may result in soil acidification because H^+ ions added to the soil solution exchange while percolation rainwater washes away the released nonacid cations.

True

False

4. Soil total acidity is made up of

a. Active acidity + residual acidity

b. Salt-replaceable (exchangeable) acidity

c. Residual Acidity

d. Active acidity + residual acidity + salt-replaceable (exchangeable) acidity

e. Salt- replaceable (exchangeable) acidity +residual acidity

5. most termites cannot digest cellulose, they depend on a mutualistic relationship with protozoa and bacteria that live int heir gut

True

False

Explanation / Answer

1. Ans: e

All are true.

2. True

3. c

Accumulation of organic matter in the soils.

4. True

5. a

Total acidity = Active acidity + residual acidity

6. True

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