To aid in moisture retention, _____ matter is added to the soil because it holds many times its own weight in water.
A) nitrogen
B) ash
C) mulch
D) organic
Question 2Soil is composed of _____ ingredients.
A) 2
B) 4
C) 6
D) 8
Question 3If green plants show a _____ color, this indicates a nitrogen deficiency.
A) white
B) yellow
C) dark green
D) purple
Question 4Match the pest terms with the pest definitions.
a. arachnid d. pest
b. vector e. weed
c. insect
1. living organism that carries disease organism
2. organism that may adversely affect human activities
3. eight-legged animal
4. considered undesirable and out of place
5. six-legged animal
Question 5Plants that host nitrogen-fixing bacteria are called ____.
A) legumes
B) vegetables
C) microorganisms
D) nematodes
Question 6Organic matter improves soil structure through _____.
A) mulching
B) peat moss
C) aggregation
D) wood chips
Question 7What is the area of the soil called that contains the roots of plants?
A) parentsphere
B) hemisphere
C) R horizon
D) rhizosphere