| Date | May 2022 | Marks available | 1 | Reference code | 22M.1.SL.TZ2.4 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 4 | Adapted from | N/A |
Question
Pasteur used swan-necked flasks and a nutrient broth to demonstrate that spontaneous generation of organisms does not occur on Earth. Some students performed a similar experiment using two swan-necked flasks, one containing broth which had been previously boiled and another containing broth which had not been boiled.
The flasks were left in the school laboratory and observed after one week. What is the evidence against the spontaneous generation theory?
A. Microorganisms died in flask F due to high temperatures.
B. No microorganisms grew in either flask.
C. Microorganisms grew in flask G.
D. No microorganisms grew in flask F but many grew in flask G.
Markscheme
D
Examiners report
Syllabus sections
- 22M.1.HL.TZ1.7: What is a universal characteristic of the genetic code? A. There are more than 64 different...
- 18M.1.SL.TZ2.4: Pasteur carried out a series of experiments that provided strong evidence against a widely...
-
21N.2.SL.TZ0.6a:
Describe the endosymbiotic theory.
- 20N.1.SL.TZ0.2: Which feature of the cell in the micrograph is consistent with the endosymbiotic theory? A....
- 18N.1.HL.TZ0.5: In a copy of Louis Pasteur’s famous experiment, broth was put into flasks as shown in the...
- 19M.2.SL.TZ2.6a: Describe briefly the endosymbiotic theory.
- 21N.1.SL.TZ0.4: How do both mitochondria and chloroplasts provide evidence for the endosymbiotic theory? A....
- 17M.1.SL.TZ2.27: The bacterium Neisseria gonorrhoeae causes infections related to the human reproductive...
- 17M.1.HL.TZ2.4: What is evidence for the endosymbiotic theory? A. RNA can catalyse metabolic reactions. B....
- 18N.1.SL.TZ0.5: Apparatus was set up as shown to collect data. The graph shows the results after 47...
- 22M.1.SL.TZ1.4: Which cell component arose first during the formation of the earliest cells? A....
- 17M.1.SL.TZ1.21: Cladograms can be created by comparing DNA or protein sequences. The cladogram on the left is...
- 21M.1.SL.TZ2.5: Which statement is evidence for the endosymbiotic theory? A. Chloroplasts contain 70S...
-
22M.1.SL.TZ1.5:
In the chimpanzee (Pan troglodytes), the haploid number of chromosomes is 24. How many sister chromatids are present in the G2 phase of a somatic cell, such as a cell in the bone marrow of the chimpanzee?
A. 12
B. 24
C. 48
D. 96
- 20N.2.SL.TZ0.2d: Apart from the ribosomes, explain the evidence for the endosymbiotic theory of the origin of...
-
17N.2.HL.TZ0.06a:
Cell biologists play an important role in research into disease, fertility, evolution and many other areas of science.
Describe the origin of eukaryotic cells according to the endosymbiotic theory.
- 17M.2.HL.TZ1.1f.ii: Suggest a reason for the greater expression of the gene for the urea transporter after an...
- 20N.1.HL.TZ0.9: The first iron ore deposits in rocks appeared about 1.8 billion years ago. What took place to...
- 17M.2.SL.TZ1.1c: Estimate how much smaller drilled oysters raised in seawater at a high CO2 concentration were...
-
17M.2.SL.TZ1.2a:
Pictured below are Louis Pasteur’s original drawings of swan-necked flasks.
Describe how Pasteur’s experiments provided convincing evidence to falsify the concept of spontaneous generation.
- 19M.2.HL.TZ1.3a: Compare and contrast the structure of a typical prokaryotic cell with that of a mitochondrion.
- 19M.2.HL.TZ1.3b: Explain how mitochondria could have been formed from free living prokaryotes.
- 19M.2.SL.TZ1.2b: Discuss the evidence for the theory that mitochondria may have evolved from free-living...
- 17M.1.SL.TZ2.4: What is evidence for the endosymbiotic theory? A. RNA can catalyse metabolic reactions. B....
- 19N.1.SL.TZ0.3: Which statement provides evidence for endosymbiosis? A. Early prokaryotes contributed to a...
-
17N.2.SL.TZ0.06a:
Describe the origin of eukaryotic cells according to the endosymbiotic theory.
