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20200327054233lab8.edited

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Biology
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Southwestern Oklahoma State University
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Lab Report 8: Energetics: Photosynthesis, Respiration, and Fermentation
1. Some leaves are variegated. That is, they display colors other than green (e.g. the Coleus
plant). Still, other plants have leaves that contain areas of white. Use the information
from the lab to identify the probable source of ATP for plant cells located in the white
regions of the leaf.
The plant has broad leaves to ensure sufficient absorption of light by the other sections
with photosynthetic pigments. The light is used for photosynthesis to generate enough
energy for the plant. The white sections of the leaves may contain traces of chlorophyll
pigments that can photosynthesize and generate energy for the plant
2. There is a mutation in corn that produces albino (white) plants. What is the potential for
the long-term survival of these white corn plants? Explain.
Albino plants cannot survive past the seedling stage. They utilize the energy stored in
seeds at the early stages of growth then eventually die when the stored energy in seed
is depleted because they do not contain photosynthetic pigments hence cannot
photosynthesize to produce the energy required for growth and other life processes.
3. Use the summary equations for photosynthesis, respiration, and the interaction of
water and carbon dioxide to explain the color changes observed with Elodea is grown in
Phenol Red.
Equation for photosynthesis
6CO
2
+ 6H
2
0
𝑆𝑢𝑛𝑙𝑖𝑔ℎ𝑡 𝑒𝑛𝑒𝑟𝑔𝑦
𝐶ℎ𝑙𝑜𝑟𝑜𝑝ℎ𝑦𝑙𝑙
C
6
H
12
O
6
+ 6O
2
Equation for respiration
Glucose is oxidized through respiration to produce energy water and carbon dioxide.
C
6
H
12
O
6
+ 6O
2
→ 6CO
2
+ 6H
2
O +ATP
The equation for the interaction of water and carbon dioxide
Carbon dioxide dissolves in water to form weak carbonic acid that changes the pH of
water hence changing the color of phenol red to yellow.
CO
2
+ H
2
O → H
2
CO
3
4. Are yeast cells autotrophs or heterotrophs? Explain why you think so.
Yeast cells are heterotrophs. They cannot generate their energy and therefore obtain
their energy from other growth media.

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Name: Section: Lab Report 8: Energetics: Photosynthesis, Respiration, and Fermentation 1. Some leaves are variegated. That is, they display colors other than green (e.g. the Coleus plant). Still, other plants have leaves that contain areas of white. Use the information from the lab to identify the probable source of ATP for plant cells located in the white regions of the leaf. The plant has broad leaves to ensure sufficient absorption of light by the other sections with photosynthetic pigments. The light is used for photosynthesis to generate enough energy for the plant. The white sections of ...
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