The following answers are probably correct (Midterm)
1.D
2.D
3.B
4.D
5.B
6.A
7.C
8.C
9.A
10.E
11.C
12.F
13.B
14.B
15.A
16.D
17.C
18.B
19.D
20.C
21.B
22.B
23.A

24.D

25.D

26.C (not on mid-term)

27.D (not on mid-term)

28.C

29.D
30. [photosynthesis question]
A. CO2 + H2O -> CH2O + O2 requires green plants (chlorophyll)
and sunlight
B. autotrophs (primary producers), for example oak trees or algae
C. yes, CH2O + O2 -> CO2 + H2O
respiration, combustion, decomposition
D. in C, wildfires can add greenhouse gases to atmosphere.
in A, photosynthesis can remove greenhouse gases from
atmosphere
31. [greenhouse effect question]
Sun (at 6000K) emits a spectrum of electromagnetic radiation that
is peaked in the visible (0.5 micron wavelength), whereas the Earth
(at about 300K) emits a spectrum of EM radiation peaked in the
infrared at 10 microns. In the Earth's radiation balance, the gases
in the Earth's atmosphere are fairly transparent to visible and
infrared wavelengths (fortunately, some gases do absorb short-
wavelength, ionizing ultraviolet radiation), whereas they effectively
absorb outgoing long-wavelength Earth radiation and slow its return
to space. The terrestrial radiation is absorbed by greenhouse
gases, the primary 2 of which are water vapor (primarily controlled
in the water cycle by evaporation and precipitation processes) and
CO2 (primarily controlled by the global carbon cycle), although
other gases such as methane have also played an important role in
past global change.
We are generally pleased with the "greenhouse effect" because it
has maintained a fairly mild climate on Earth for most of Earth
history, even when early solar output was reduced by 30%. We are
worried about an "enhanced greenhouse effect" driven by excess
greenhouse gases being put into the Earth's atmosphere by human
activities such as fossil-fuel burning.
32. [water question]
see classnotes for Feb 14, 16 and 18
33. a-sun, b-photosynthesis CO2+H2O->CH2O+O2 where CH2O is
the plant matter (or food) generated by using solar energy, c-
energy is transferred by consumption (eating) of organisms at lower
trophic levels by organisms higher in trophic levels in food chains
(webs)
Good Luck,