2.9 Photosynthesis

Quiz by Dr. Reza M

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14 questions
• Q1
The graph shows the effect of increasing light intensity on the rate of CO2 uptake by a species of green plant maintained in conditions of constant temperature and CO2 concentration. Which statement is consistent with the graph?
There is a negative correlation between CO2 uptake and light intensity.
Cell respiration leads to net production of CO2 at low light intensity.
Rates of photosynthesis increase with temperature.
Photosynthesis stops at high light intensity.
30s
• Q2
The graph shows the absorption spectra of chlorophyll a and chlorophyll b. What can be concluded from the graph?
Other pigments must absorb light between blue and red in the spectrum
Chlorophyll b absorbs red light more efficiently than blue light
Both chlorophyll a and chlorophyll b absorb a large amount of green light
Chlorophyll a and chlorophyll b have different absorption peaks
60s
• Q3
Which wavelength of electromagnetic radiation is absorbed efficiently by chlorophyll for photosynthesis?
450 nm
45 μm
450 μm
45 nm
60s
• Q4
The graph shows the relationship between rate of photosynthesis and light intensity as influenced by both temperature and CO2 concentration. What conclusion can be drawn from the data in the graph?
Temperature is only the limiting factor at high light intensities and CO2 concentrations.
Both temperature and light intensity are limiting factors at 660 ppm CO2 and less than 200 W m–2 light intensity.
Light intensity is only the limiting factor at high light intensities.
CO2 is always the limiting factor at low light intensities and temperatures.
60s
• Q5
What are final products of photosynthesis and of aerobic respiration?
B
D
C
A
60s
• Q6
An experiment was set up so that each test tube contained water at a pH of 6.3 and a pH indicator. Test tubes 1 and 2 also contained a common pond autotroph. Carbon dioxide dissolves in water and forms carbonic acid. After three days the four test tubes were found to have these results.
A
C
D
B
60s
• Q7
Cladograms can be created by comparing DNA or protein sequences. The cladogram on the left is based on DNA sequences and the cladogram on the right is based on comparing protein sequences. What is the reason that cladograms based on DNA sequences are more reliable predictors of the phylogenetic relationship of species than cladograms based on protein sequences?
There are 20 different amino acids but only 4 nucleotides.
DNA mutates but amino acids do not.
Several different triplets of bases can code for the same amino acid.
Amino acids are not as chemically stable as DNA nucleotides.
60s
• Q8
What is the relative wavelength in the visible spectrum of red light and blue light and are these colours absorbed or reflected by chlorophyll?
A
D
C
B
60s
• Q9
The fungus Rhytisma grows on the leaves of certain trees, causing a yellow leaf area in which chlorophyll is no longer present. A black, tar-like stain later spreads out. What happens in the leaf when Rhytisma is present? I. An increase in the intake of carbon dioxide II. A reduction in the production of oxygen III. An increase in the loss of water
I, II and III
II only
I only
II and III only
60s
• Q10
The bacterium Neisseria gonorrhoeae causes infections related to the human reproductive system. The graph shows the percentage of samples in which this bacterium showed resistance to six antibiotics over a period of ten years. What is a possible explanation for the total percentage resistance being larger than 100% in 2010?
Some bacteria are resistant to more than one antibiotic.
There was an epidemic of Neisseria gonorrhoeae in that year.
More people have been sampled in that year.
People do not take the antibiotics as prescribed.
60s
• Q11
What is a feature of shorter wavelength visible radiation?
It is absorbed by greenhouse gases.
It includes violet light.
It is reflected by chlorophyll.
It has less energy per photon than longer wavelengths.
60s
• Q12
How can the rate of photosynthesis be measured? I. By the amount of oxygen produced II. By the increase in biomass III. By the amount of carbon dioxide produced
I and II only
I, II and III
I and III only
I only
60s
• Q13
What happens in both respiration and photosynthesis?
Triose phosphates are decarboxylated.
Electrons pass through ATP synthase.
ATP is produced.