BIO 201 Unit 5 and 6 Test Questions and Correct Answers
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When a plant is alive it has energy in its living parts. When it dies all the parts are still there, but it is no longer alive. How much of the energy is still in the dead (but not yet decomposing) plant? Nearly all of the energy
Where does most of the matter in a plant come from? gas in the air
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bio 201 unit 5 and 6 test questions and correct an
when a plant is alive it has energy in its living
a most of the mass in the logs was turned into he
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BIO 201 Unit 5 and 6 Test Questions and
Correct Answers
When a plant is alive it has energy in its living parts. When it dies all the parts are still
there, but it is no longer alive. How much of the energy is still in the dead (but not yet
decomposing) plant? ✅Nearly all of the energy
Where does most of the matter in a plant come from? ✅gas in the air
What is the greatest energy source for plants? ✅Sunlight (>99%)
You burn 500 kg of logs in a fire. Choose the best answer:
A. Most of the mass in the logs was turned into heat energy
B. Most of the mass in the logs was permanently destroyed
C. Most of the mass in the logs was turned into light energy (photons)
D. Most of the mass in the logs went into the air ✅D. Most of the mass in the logs went
into the air
A person stands on a very accurate and sensitive scale for 2 hours. What pattern will be
observed? ✅The person's weight will decrease (CO2 weighs more than carbon alone
and oxygen gas alone, exhaling CO2 results in a net loss for the organism)
Which of the following is food?
A -> skin (fungus on skin)
B -> chicken
C -> plant food
D -> poop
E -> CO2
F -> water
G -> dead plant
H -> sugar
I -> calcium/vitamins (mineral supplements)
J -> rotting tomato ✅A, B, D, G, H, J (all are carbon-rich)
C, E, F, and I are NOT food because C is not a real actual food (just in the name), E
and F are carbon-poor molecules (H2O and CO2), and I is a mineral supplement, which
is also carbon-poor
In which of the following taxa is carbon used to increase weight/size/growth?
A. Fungi
B. Plants
C. Animals
D. A and B
,E. B and C
F. A, B, and C ✅F. A, B, and C
Which of the following taxa release CO2 into the air when they metabolize food (e.g.
Sugars, glucose)?
A. Fungi
B. Plants
C. Animals
D. A and B
E. B and C
F. A, B, and C ✅F. A, B, and C (all of them need to perform cellular respiration to
metabolize food, which releases CO2!)
What would be the change in mass over time if you stood on a very sensitive scale for 2
hours INSIDE of an airtight glass box? ✅It would stay the same (also you would be
dead)
What would be the change in mass over time if you stood on a very sensitive scale for 2
hours OUTSIDE of an airtight glass box? ✅It would decrease (CO2 release through
breathing, CO2 is heavier than O2 (which is being breathed in)
What statement represents a plant's change in mass over a time period of 2 hours?
✅It would increase (plant is photosynthesizing and thus bringing carbon into its body
through carbon dioxide to make glucose, which causes it to gain weight)
What statement represents a turtle's change in mass over a time period of 2 hours?
✅It would decrease (losing carbon dioxide through cellular respiration and lung
respiration, thus losing matter)
What statement represents a fungus's change in mass over a time period of 2 hours?
✅It would decrease (losing carbon dioxide through cellular respiration, thus losing
matter)
Why does the same volume of coal hold more energy than the same volume of wood?
✅Because the coal has more chemical bonds in it than does the wood.
A sealed greenhouse (a glass building where plants are grown) contains many plants.
After 1 week, all of the plants have grown a little larger. After 1 week, how will the mass
of the air in the greenhouse change? ✅It will decrease, because the plants in the
greenhouse are adding carbon from the air to their tissues
Eutrophication ✅excessive richness of nutrients in a lake or other body of water,
frequently due to runoff from the land, which causes a dense growth of plant life and
death of animal life from lack of oxygen, (increased growth of organisms such as algae
or cyanobacteria)
, (t/f) Eutrophication occurs when excess nitrogen is deposited into soil and the soil
ecosystem is disrupted. ✅False -> eutrophication is the disruption of a WATER
ecosystem due to runoff, causing dense growth of algae and cyanobacteria and
disrupting animal life)
In BIO 201, a student uses the following analogy: "Food for an animal is like gasoline for
a car. Some energy from the gasoline is used to run the car, some is released as heat,
and the rest is stored in the tank for later." Which one of the following is a limitation of
this analogy? ✅Animals use food for matter in addition to energy.
Which of the following statements is TRUE about eutrophication?
A. Eutrophication is caused by excessive richness of nutrients in a lake or other body of
water.
B. Eutrophication is frequently due to runoff from the land, such as agricultural fields.
C. Eutrophication involves which a dense growth of photosynthetic organisms.
D. Eutrophication frequently causes a lack of dissolved oxygen in bodies of water.
E. The lack of dissolved oxygen during eutrophication is caused by bacterial
decomposition of dead algae.
F. All of the above are true. ✅F. All of the above are true.
Which of the following statements about Nitrogen gas is FALSE?
A. Nitrogen gas (N2) is very common in Earth's atmosphere
B. Many organisms are able to use N2 to produce energy
C. Nitrogen gas (N2) is converted by bacteria into forms usable by plants and animals.
D. Nitrous Oxide (N2O) from your dentist's office contributes to the greenhouse effect
✅B. Many organisms are able to use N2 to produce energy
(t/f) Cells in all three domains of life have similarities in their mitochondria due to
descent from a common ancestor. ✅False
(t/f) Cells in all three domains of life have similarities in their plasma membranes (cell
membranes) due to descent from a common ancestor. ✅True
Which of the following is the most accurate statement regarding the evolution of
mitochondria?
A. Mitochondria evolved from an endosymbiotic proteobacterium
B. Chloroplasts evolved before mitochondria
C, bacteria have mitochondria that are very different from those of eukaryotes
D. Mitochondria evolved from endosymbiotic bacteria multiple times in eukaryotes ✅A.
Mitochondria evolved from an endosymbiotic proteobacterium
(t/f) The most recent common ancestor of all eukaryotes had mitochondria, which
evolved from bacteria. ✅True
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