BOTANY EXAM 3 QUESTIONS & ANSWERS (FINAL) GRADED A+
1.The function(s) of soil is/are to:
A.) hold plants in place
B.) provide water to plants
C.) provide sugars and other carbohydrates to plants
D.) hold plants in place and provide water to plants
E.) all of these are true: D.) hold plants in place and provide water to plant
2.The mineral particles of soil are classed by size as:
A.) loam and organic matter
B.) rock, gravel, and sand
C.) sand, silt, and clay
D.) sand, silt, and loam
E..) silt, clay, and loam: C.) sand, silt, and clay
3.Soil bacteria and fungi are beneficial because:
A.) they are a source of food for soil organisms such as worms.
B.) they decompose organic matter which makes nutrients more available
to plants.
C.) they hold the soil together and help keep it from eroding easily.
D.) all of these are true
E.) none of these are true: D.) All of these are true
4.The pH is an important consideration for gardeners because:
A.) mineral nutrients present in the soil may be unavailable to plants if
condi- tions are too acidic or too alkaline.
B.) roots cannot penetrate acidic soil
,C.) the beneficial soil organisms survive best in highly acidic soils
D.) we need acidic soil to produce acidic fruits such as tomatoes and apples
E.) none of these are true: A.) mineral nutrients present in the soil may be
unavail- able to plants if conditions are too acidic or too alkaline.
5.When a soil has high amount of salt, water moves from the plant to the
soil because:
A.) the plant is hypertonic relative to the soil
B.) the plant is hypotonic relative to the soil
C.) the salt blocks the movement of water into the plant
D.) the soil is isotonic with the plant
E.) the salt binds to the water molecules: B.) the plant is hypotonic relative
to the soil
6.Soils with large proportions of clay are not productive because:
A.) they are too high in pH
B.) they have poor drainage
C.) they are too aerated
D.) they do not hold mineral ions well
E.) all of these are true: B.) they have poor drainage
7.Which of the following statements is TRUE?
A.) soils with large particles hold more water
B.) soils with large particles can provide more ions to plants
C.) soils with small participles provide more ions to plants
D.) soils with large particles hold more water and ions
E.) all of these statements are true: C.) soils with small participles provide
more ions to plants
, 8.Humus is:
A.) dead leaves and twigs on the soil surface
B.) partly decayed organic matter in the soil
C.) rock, gravel, and sand
D.) a microorganism that decomposes organic matter
E.) none of these are correct: B.) partly decayed organic matter in the soil
9.Where are MOST of the mineral ions held within the soil?
A.) they are attached to the surface of the plant roots
B.) they are attached to the soil particles
C.) they are dissolved in the soil water
D.) they are in the air spaces
E.) all of these are true: B.) they are attached to the soil particles
10.Dead leaves and branches, animals droppings, and the remains of
dead animals and microorganisms are all part of the soil's:
A.) clay content
B.) mineral ions
C.) organic matter
D.) mineral ions and organic matter
E.) all of theses are true: C.) organic matter
11.Pore spaces:
A.) are all the same size in good soil
B.) hold air and water
C.) never completely fill with water after a long rain
D.) should be eliminated in a good soil
E.) none of these are true: B.) hold air and water
1.The function(s) of soil is/are to:
A.) hold plants in place
B.) provide water to plants
C.) provide sugars and other carbohydrates to plants
D.) hold plants in place and provide water to plants
E.) all of these are true: D.) hold plants in place and provide water to plant
2.The mineral particles of soil are classed by size as:
A.) loam and organic matter
B.) rock, gravel, and sand
C.) sand, silt, and clay
D.) sand, silt, and loam
E..) silt, clay, and loam: C.) sand, silt, and clay
3.Soil bacteria and fungi are beneficial because:
A.) they are a source of food for soil organisms such as worms.
B.) they decompose organic matter which makes nutrients more available
to plants.
C.) they hold the soil together and help keep it from eroding easily.
D.) all of these are true
E.) none of these are true: D.) All of these are true
4.The pH is an important consideration for gardeners because:
A.) mineral nutrients present in the soil may be unavailable to plants if
condi- tions are too acidic or too alkaline.
B.) roots cannot penetrate acidic soil
,C.) the beneficial soil organisms survive best in highly acidic soils
D.) we need acidic soil to produce acidic fruits such as tomatoes and apples
E.) none of these are true: A.) mineral nutrients present in the soil may be
unavail- able to plants if conditions are too acidic or too alkaline.
5.When a soil has high amount of salt, water moves from the plant to the
soil because:
A.) the plant is hypertonic relative to the soil
B.) the plant is hypotonic relative to the soil
C.) the salt blocks the movement of water into the plant
D.) the soil is isotonic with the plant
E.) the salt binds to the water molecules: B.) the plant is hypotonic relative
to the soil
6.Soils with large proportions of clay are not productive because:
A.) they are too high in pH
B.) they have poor drainage
C.) they are too aerated
D.) they do not hold mineral ions well
E.) all of these are true: B.) they have poor drainage
7.Which of the following statements is TRUE?
A.) soils with large particles hold more water
B.) soils with large particles can provide more ions to plants
C.) soils with small participles provide more ions to plants
D.) soils with large particles hold more water and ions
E.) all of these statements are true: C.) soils with small participles provide
more ions to plants
, 8.Humus is:
A.) dead leaves and twigs on the soil surface
B.) partly decayed organic matter in the soil
C.) rock, gravel, and sand
D.) a microorganism that decomposes organic matter
E.) none of these are correct: B.) partly decayed organic matter in the soil
9.Where are MOST of the mineral ions held within the soil?
A.) they are attached to the surface of the plant roots
B.) they are attached to the soil particles
C.) they are dissolved in the soil water
D.) they are in the air spaces
E.) all of these are true: B.) they are attached to the soil particles
10.Dead leaves and branches, animals droppings, and the remains of
dead animals and microorganisms are all part of the soil's:
A.) clay content
B.) mineral ions
C.) organic matter
D.) mineral ions and organic matter
E.) all of theses are true: C.) organic matter
11.Pore spaces:
A.) are all the same size in good soil
B.) hold air and water
C.) never completely fill with water after a long rain
D.) should be eliminated in a good soil
E.) none of these are true: B.) hold air and water
