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UA BSC 108 EXAM 2 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
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