Download A) pH B) sediment D) colder temperature 1. An ecosystem is

1. An ecosystem is represented below.
The organisms represented as algae and seaweed are found in the area shown due to which factor?
A) pH
B) sediment
C) light intensity
2. An experimental setup is shown below.
D) colder temperature
4. The diagram below represents the setup for an experiment. Two
black paper discs are opposite each other on both sides of each of
two leaves.
Which hypothesis would most likely be tested using this setup?
A)
B)
C)
D)
Light is needed for the process of reproduction.
Glucose is not synthesized by plants in the dark.
Protein synthesis takes place in leaves.
Plants need fertilizers for proper growth.
3. A scientific study showed that the depth at which algae were
found in a lake varied from day to day. On clear days, the algae
were found as much as 6 meters below the surface of the water
but were only 1 meter below the surface on cloudy days. Which
hypothesis best explains these observations?
A)
B)
C)
D)
Light intensity affects the growth of algae.
Wind currents affect the growth of algae.
Nitrogen concentration affects the growth of algae.
Precipitation affects the growth of algae.
What would this experimental setup most likely show?
A)
B)
C)
D)
glucose is necessary for photosynthesis
protein is a product of photosynthesis
light is necessary for photosynthesis
carbon dioxide is a product of photosynthesis
5. Which process is an outcome of photosynthesis?
A) Complex molecules are broken down to form simple
molecules.
B) Water is absorbed into the root hairs.
C) Light energy is converted into chemical energy.
D) Water is transported through vascular tissue.
Base your answers to questions 6 and 7 on the graph below
which relates the rate of photosynthesis in a geranium plant to
varying temperature and light intensity.
9. The graph below shows the effect of a factor on the
photosynthetic rate of the green marine algaeEnteromorpha linza.
Which is most likely represented by factor X?
A) light intensity
C) competition level
6. The relative rate of photosynthesis is greatest under which
conditions of light intensity and temperature?
A)
B)
C)
D)
10. If the leaves of a geranium plant receive an adequate supply of
raw materials, which graph shows how the rate of
photosynthesis is related to increasing light intensity received
by the plant?
A)
B)
low light intensity at 25°C
low light intensity at 35°C
high light intensity at 25°C
high light intensity at 35°C
7. At a low light intensity, an increase in temperature will
A)
B)
C)
D)
B) water concentration
D) substratum type
greatly slow down the rate of photosynthesis
greatly speed up the rate of photosynthesis
have little effect on the rate of photosynthesis
have no effect on the rate of photosynthesis
8. Which laboratory procedure would be best for demonstrating the
effect of light intensity on the production of chlorophyll in pea
plants?
A) using 10 plants of different species, each grown under the
same intensity of light
B) using 10 plants of different species, each grown under a
different intensity of light
C) using 10 plants of the same species, each grown under the
same intensity of light
D) using 10 plants of the same species, each grown under a
different intensity of light
C)
D)
Base your answers to questions 11 through 13 on the information and graph below and on your knowledge of biology.
A student conducts an experiment to determine how the amount of light affects the rate of oxygen production in a
plant. The graph represents the rate of oxygen produced for one trial, X, in the experiment. By the end of the
experiment, the plant had not reached maximum oxygen production.
11. Identify the biochemical process occurring in this cell that produces the oxygen.
Process: ________________
12. The diagram above represents a cell from the plant being used in the study. Draw an arrow to a cell structure directly
responsible for oxygen production in this cell. The tip of the arrow must touch the cell structure.
13. If a student supplies more light than was received during trial X, a bar placed on the graph to represent the results would
most likely be
A)
B)
C)
D)
shorter than bar X and placed to the left of bar X
shorter than bar X and placed to the right of bar X
taller than bar X and placed to the left of bar X
taller than bar X and placed to the right of the bar X
Base your answers to questions 14 through 16 on the information below and on your knowledge of biology.
In an investigation, plants of the same species and the same initial height were exposed to a constant number of
hours of light each day. The number of hours per day was different for each plant, but all other environmental factors
were the same. At the conclusion of the investigation, the final height of each plant was measured. The following data
were recorded:
8 hours, 25 cm; 4 hours, 12 cm; 2 hours, 5 cm; 14 hours, 35 cm; 12 hours, 35 cm; 10 hours, 34 cm; 6 hours, 18 cm
14. a Organize the data by completing both columns in the data table provided, so that the hours of daily light exposure
increase from the top to the bottom of the table.
b Mark an appropriate scale on each axis.
c Plot the data for final height on the grid. Surround each point with a small circle and connect the points.
15. If another plant of the same species had been used in the investigation and exposed to 16 hours of light per day, what
would the final height of the plant probably have been? Support your answer.
16. State one possible reason that the plant exposed to 2 hours of light per day was the shortest.
Answer Key
light on photo
1.
C
2.
B
3.
A
4.
C
5.
C
6.
D
7.
C
8.
D
9.
A
10.
C
11.
photosynthesis or
autotrophic nutrition
or photolysis
12.
13.
D
14.
15.
Examples:— 35
centimeters, because
the plant reached
optimal growth—
shorter, because of
dehydration, stress on
the plant— taller,
because more light,
more growth
16.
Examples:— The
plant exposed to 2
hours of light per day
produced the smallest
amount of food.—
Plants require 12–14
hours of light per day
to reach optimum
growth.— The plant
exposed to 2 hours of
light per day carried
on photosynthesis for
the shortest time.