Leaves falling on the ground initially become a part
of soil horizon __________, but will later be a
component of soil horizon __________.
a. A; B
b. A; O
c. O; A
d. B; A
e. B; C
Answer: c
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Members of the order Desulfovibrionales use which of the following as electron acceptors during anaerobic respiration?
A. Organic acids and alcohols B. CO2 C. O2 D. Elemental sulfur or sulfate
The energy-requiring process by which liquid water becomes water vapor (a gas) is
A. All of the answer choices are correct. B. sublimation. C. condensation. D. evaporation. E. convection.
All photosynthetic protists ________.
A. carry out anoxygenic photosynthesis using two photosystems B. carry out oxygenic photosynthesis using one photosystem C. carry out oxygenic photosynthesis using two photosystems D. carry out anoxygenic photosynthesis using one photosystem
Complex tissues are tissues consisting of ____.
A. two or more cell types B. only one cell type C. only parenchyma cells D. only collenchyma cells E. only sclerenchyma cells