8. (a)
(i) Are fungi prokaryotic or eukaryotic?
(ii) Name one structure in plant cells not found in fungi - Leaving Cert Biology - Question 8 - 2012
Question 8
8.
(a)
(i) Are fungi prokaryotic or eukaryotic?
(ii) Name one structure in plant cells not found in fungi.
(b)
(i) What is the purpose of using agar when gr... show full transcript
Worked Solution & Example Answer:8. (a)
(i) Are fungi prokaryotic or eukaryotic?
(ii) Name one structure in plant cells not found in fungi - Leaving Cert Biology - Question 8 - 2012
Step 1
Are fungi prokaryotic or eukaryotic?
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Answer
Fungi are eukaryotic organisms. They possess complex cells with membrane-bound organelles, including a defined nucleus.
Step 2
Name one structure in plant cells not found in fungi.
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Answer
One structure found in plant cells but not in fungi is the chloroplast, which is responsible for photosynthesis.
Step 3
What is the purpose of using agar when growing fungi or bacteria in the laboratory?
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Answer
The purpose of using agar is to provide a solid medium that supplies nutrients or substrates necessary for the growth of fungi and bacteria.
Step 4
Suggest one reason why leaf yeasts are more plentiful in July than in March.
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Answer
Leaf yeasts are more plentiful in July due to factors such as higher temperatures and increased availability of nutrients, which promote yeast reproduction and growth.
Step 5
Describe how you introduced the leaf yeasts into agar plates.
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Answer
To introduce leaf yeasts into agar plates, I utilized a sterile technique by taking a leaf sample and gently pressing it against the surface of the agar. This method ensures the transfer of yeast cells while minimizing contamination.
Step 6
What was the precise purpose of a control in this investigation?
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Answer
The precise purpose of a control in this investigation was to ensure that any observed yeast growth was due to the leaf sample and not from any yeast present on the agar plates prior to the experiment.
Step 7
How did you recognize the leaf yeasts when they appeared on the agar?
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The leaf yeasts were recognized by the development of pink colonies on the agar, which indicated successful growth of yeast from the leaf sample.
Step 8
How did you safely dispose of the plates at the end of the investigation?
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The plates were safely disposed of by immersing them in disinfectant and autoclaving them to ensure that any viable organisms were effectively eliminated.
Step 9
Using the axes below, draw a graph to show how the number of leaf yeasts varied following their introduction into the plate.
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Answer
The graph should depict a lag phase initially, followed by a logarithmic growth phase as the number of leaf yeasts increases, stabilizing in the stationary phase, and then showing a decline as resources become scarce.
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