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Worksheets04.3 - The Process of Photosynthesis (15pts.)
Total questions: 11
Worksheet time: 9mins
Thylakoids contain clusters of chlorophyll and proteins known as (a) . They absorb sunlight and generate high-energy (b) that pass along the (c) .
photosystems
electrons
electron transport chain
CAM plants
The light-independent reactions of photosynthesis are also known as (a) . During this process, energy from ATP and (b) is used to assemble high-energy (c) .
the Calvin Cycle
NADPH
sugars
stroma
Based on the Graph, When light intensity is BELOW 200 μmol photons/m2/s, (a) plants have a higher rate of photosynthesis?
Shade
Sun
Photosynthesis
CO2
Light intensity in the Sonoran Desert averages about 400 μmol photons/m2/s.
Based on the Graph, What is the approximate rate of photosynthesis for sun plants that grow in this environment?
0
3
6
9
12
As the rate of photosynthesis increases, what do you think happens to the rate at which sugars are produced by the plant?
As Photosynthesis increases, Sugar production also increases
As Photosynthesis increases, Sugar production will decrease
As Photosynthesis increases, Sugar production stays the same
For both groups of plants, what BEST describes the relationship between light intensity and rate of photosynthesis?
The rate of photosynthesis increases with light intensity, and might be limited by other factors such as water and temperature.
The rate of photosynthesis increases with light intensity, and it increases without limit.
The rate of photosynthesis is independent of light intensity, but may be limited by other factors such as water and temperature.
The rate of photosynthesis is at a maximum over a narrow range of light intensities.
Briana is studying a model of the light-dependent reactions of photosynthesis. The diagram shows a part of this model.
Briana notices the electrons that the water molecules release. She asks, "Will the electrons build up in the chloroplast?"
Which addition to the diagram would be most useful for answering Briana's question?
a wavy arrow that shows Photosystem I
an equation for the chemical reaction that forms water from hydrogen ions, electrons, and oxygen molecules
an arrow that shows the electrons moving through electron carriers, and received by NADP+
an equation for the chemical reaction that forms hydrogen gas from hydrogen ions and electrons
During the light-independent reactions of photosynthesis, carbon dioxide is combined with hydrogen to form sugars.
What is the energy SOURCE, if any, that allows this process to occur?
The energy source is high-energy bonds in sugar molecules.
The energy source is ATP from the light-dependent reactions.
The energy source is ATP from processes that occur in other organelles of the cell.
No energy source is used; the process occurs without an energy input.
When the light-independent reactions are occurring, gases diffuse between the chloroplast and the air that surrounds the plant.
Why is gas diffusion essential during this stage of photosynthesis?
Water vapor is used to assemble sugar molecules.
Carbon dioxide is used to assemble sugar molecules.
Molecular oxygen is used to assemble sugar molecules.
Water vapor is released as a waste product.
Although animals do not perform photosynthesis, their food supply depends on the sugars that photosynthesis produces.
What is the other significant benefit to animals that photosynthesis provides?
generating ATP and NADPH
removing water from the environment
adding carbon dioxide to the atmosphere
adding oxygen to the atmosphere
Brenda is developing a model of the process of photosynthesis. One of her goals is to identify the products of photosynthesis that will later be used to assemble sugars, lipids, amino acids, and other essential compounds for the organisms.
In which part of the model should these PRODUCTS be identified?
in the light-dependent reactions, where water molecules are split
in the light-dependent reactions, where ATP is synthesized
in the light-independent reactions, where carbon dioxide enters the cycle
in the light-independent reactions, where 3-carbon sugars exit the cycle
