Which biogeochemical cycle produces photochemical smog and why is it a hazard? What will be an ideal response?
The nitrogen cycle is the origin of photochemical smog. During the process of the
combustion of fossil fuels, for example in automobile engines, the nitrogen contained within
the fuel is chemically altered and released into the atmosphere as nitrogen oxides. These
oxides, in the presence of sunlight, form photochemical smog, an air pollutant that is harmful
to plant and animal tissues.
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The transformation frequency of very competent cells is about 10-6, or about 1 in 1,000,000 when an excess of DNA is used.
Answer the following statement true (T) or false (F)
Which of the following statements best characterizes a euphyll?
A. It differs from a lycophyll by having a branched, rather than a single, vascular system. B. It is believed to have evolved from a branch that flattened and developed photosynthetic tissue between the branches. C. It is also called a megaphyll because it is large compared to a lycophyll. D. It evolved separately from the photosynthetic appendages of moss gametophytes. E. All of the choices provided are correct.
matching the descriptions with the
most appropriate group listed below. a. Bacteria b. Protista c. Plantae d. Fungi e. Animalia E 88. multicellular producers E 89. prokaryotic M 90. unicellular organisms of considerable internal complexity M 91. multicellular motile consumers E 92. oldest living organisms M 93. unicellular producers M 94. multicellular decomposers
Which method is rapid and economical in terms of materials, but requires a certain degree of skill to master the technique.
A) Streak-plate method B) Loop dilution (pour plate) method C) Spread-plate method