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UA BSC 108 EXAM 2 2025 UPDATED ACTUAL
EXAM WITH CORRECT SOLUTIONS.
What is a photosynthetic autotroph? - correct answer- An
organism that makes its own food from inorganic ingredients.
What is the fluid inside chloroplasts called? - correct answer-
Stroma
What are the membranes inside chloroplasts called? - correct
answer- inner and outer membranes
Write the overall equation for photosynthesis. - correct answer-
6CO2+6H2O→C6H12O6+6O2
What is the primary function of pigments in photosynthesis?
Name the primary pigment used in photosynthesis. - correct
answer- Pigments absorb certain wavelengths. They are the
means by which the energy of sunlight is captured for
photosynthesis. The primary pigment used in photosynthesis is
Chlorophylla-a.
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Why are leaves green? - correct answer- Their green color is
from chlorophyll, a pigment (light- absorbing molecule) in the
chloroplasts that plays a central role in converting solar energy
to chemical energy.
How and where does water enter a plant? - correct answer-
Water enters root hair cells by osmosis.
How and where does carbon dioxide enter a plant? - correct
answer- Carbon Dioxide diffuses through small holes in the
underside of leaves, called the stomata.
The light reactions take place in three stages. Name the stages
and summarize the events of each stage. 1. Photons excite
electrons in the chlorophyll of the first photosystem. These
photons are then trapped by the primary electron acceptor. This
photosystem then replaces the lost electrons by extracting new
ones from water. This is the step that releases O2 during
photosynthesis. 2. Energized electrons from the first
photosystem pass down an electron transport chain to the
second photosystem. The chloroplast uses the energy released
by this electron "fall" to make ATP. 3. The second photosystem
transfers its light-excited electrons to NADP+, reducing it to
NADPH.
List all products of the light reactions. carbon dioxide, water.
Glucose, oxygen
UA BSC 108 EXAM 2 2025 UPDATED ACTUAL
EXAM WITH CORRECT SOLUTIONS.
What is a photosynthetic autotroph? - correct answer- An
organism that makes its own food from inorganic ingredients.
What is the fluid inside chloroplasts called? - correct answer-
Stroma
What are the membranes inside chloroplasts called? - correct
answer- inner and outer membranes
Write the overall equation for photosynthesis. - correct answer-
6CO2+6H2O→C6H12O6+6O2
What is the primary function of pigments in photosynthesis?
Name the primary pigment used in photosynthesis. - correct
answer- Pigments absorb certain wavelengths. They are the
means by which the energy of sunlight is captured for
photosynthesis. The primary pigment used in photosynthesis is
Chlorophylla-a.
, 2 | Page
Why are leaves green? - correct answer- Their green color is
from chlorophyll, a pigment (light- absorbing molecule) in the
chloroplasts that plays a central role in converting solar energy
to chemical energy.
How and where does water enter a plant? - correct answer-
Water enters root hair cells by osmosis.
How and where does carbon dioxide enter a plant? - correct
answer- Carbon Dioxide diffuses through small holes in the
underside of leaves, called the stomata.
The light reactions take place in three stages. Name the stages
and summarize the events of each stage. 1. Photons excite
electrons in the chlorophyll of the first photosystem. These
photons are then trapped by the primary electron acceptor. This
photosystem then replaces the lost electrons by extracting new
ones from water. This is the step that releases O2 during
photosynthesis. 2. Energized electrons from the first
photosystem pass down an electron transport chain to the
second photosystem. The chloroplast uses the energy released
by this electron "fall" to make ATP. 3. The second photosystem
transfers its light-excited electrons to NADP+, reducing it to
NADPH.
List all products of the light reactions. carbon dioxide, water.
Glucose, oxygen
