Questions (4-5)
You let your neighbor shoot coyotes on your ranch in Arizona. After all the coyotes are gone, you notice that the rabbit population increases dramatically. Along with this you notice that the rabbits have consumed most of the grasses and forbs, and the biomass and diversity of plants drops dramatically. A few years later, your neighbor moves away, and within a few years the coyote population recovers, the rabbit population declines, and the biomass and diversity of grasses and forbs are back up to what they used to be.
4) The rabbits could be described as:
a. primary producers
b. primary consumers
c. a keystone species
The coyotes in the above example could be discribed as
a. primary producers
b. primary consumers
c. a keystone species
d. b and c
Questions (6-10) You place an air-tight chamber on a leaf in sunlight and measure the change in CO2 and H2O concentrations in the air in the chamber.
6) The rate of change in CO2 concentration of the air in the chamber provides a measure of:
a. transpiration
b. gross photosynthesis
c. net photosynthesis
d. respiration
The rate of change in H2O concentration of air in the chamber provides a measure of:
a. transpiration
b. gross photosynthesis
c. net photosynthesis
d. respiration
If the leaf has a high photosynthetic rate, the CO2 concentration of air in the chamber will
a. increase
b. decrease
If the leaf has a high phosotsynthetic rate, the H2O concentration of air in the chamber will
a. increase
b. decrease
If you cover the outside of the chamber with an opaque sheet so that the leaf inside it is in the dark, the rate of change of CO2 concentration of air in the chamber would be a measure of
a. transpiration
b. gross photosynthesis
c. net photosynthesis
d. respiration
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4. c 5. a 6. c 7. b 8. a 9. b 10.c
4. B
5. D
6. C
7. D
8. B
9. B?
10. D
4) The rabbits could be described as: b. primary consumers
To determine the classification of the rabbits, we need to understand their role in the food chain. In this scenario, the coyotes are shooting the coyotes, which indicates that the coyotes are the primary consumers, meaning they consume plants (grass and forbs). The rabbits, in turn, consume the primary consumers (plants) and are considered secondary consumers, making them primary consumers.
The coyotes in the above example could be described as: d. b and c
The coyotes are the ones shooting the coyotes, which indicates that they are the primary consumers. Additionally, they have a significant impact on the ecosystem as their absence led to an increase in rabbit populations and a decline in plants. This makes them a keystone species, which refers to a species that has a disproportionately large effect on its environment compared to its abundance.
6) The rate of change in CO2 concentration of the air in the chamber provides a measure of: c. net photosynthesis
When measuring the change in CO2 concentration in the chamber, it provides information about the photosynthetic activity of the leaf. The net photosynthesis can be calculated by assessing the overall change in CO2 concentration, taking into account both the CO2 uptake during photosynthesis and the CO2 release during respiration.
The rate of change in H2O concentration of air in the chamber provides a measure of: a. transpiration
The change in H2O concentration in the chamber relates to transpiration, which is the process by which plants release water vapor through their leaves. This measurement helps us understand the water loss from the plant and the rate of transpiration occurring.
If the leaf has a high photosynthetic rate, the CO2 concentration of air in the chamber will: b. decrease
A high photosynthetic rate means that the leaf is actively photosynthesizing and taking in CO2. As a result, the CO2 concentration in the chamber will decrease as the leaf utilizes the CO2 for photosynthesis.
If the leaf has a high photosynthetic rate, the H2O concentration of air in the chamber will: a. increase
During photosynthesis, water molecules are broken down, and oxygen and hydrogen atoms are released. This leads to an increase in the concentration of water vapor (H2O) in the chamber as the leaf undergoes high photosynthetic activity.
If you cover the outside of the chamber with an opaque sheet so that the leaf inside it is in the dark, the rate of change of CO2 concentration of air in the chamber would be a measure of: d. respiration
When the leaf is in the dark, it cannot undergo photosynthesis because it lacks light energy. In the absence of photosynthesis, the CO2 concentration in the chamber will predominantly be influenced by the respiration process of the leaf, resulting in an increase in CO2 concentration as the leaf releases CO2 during respiration.