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Answer the following by reference to Rhizopus - Leaving Cert Biology - Question c - 2008
Question c
Answer the following by reference to Rhizopus. (i) To which kingdom does Rhizopus belong? (ii) Draw a diagram to show the structure of Rhizopus and label three par... show full transcript
Worked Solution & Example Answer:Answer the following by reference to Rhizopus - Leaving Cert Biology - Question c - 2008
Step 1
Step 2
Draw a diagram to show the structure of Rhizopus and label three parts.
Answer
A diagram of Rhizopus should resemble the letter 'H'. It must include the following labeled parts:
- Stolon: The horizontal, stem-like structure.
- Sporangiophore: The upright structure that holds the sporangium.
- Sporangium: The round structure at the top of the sporangiophore where spores are formed.
Step 3
Describe, using labelled diagrams, sexual reproduction in Rhizopus.
Answer
In Rhizopus, sexual reproduction involves the following steps:
- The hyphae of two compatible mating types come into contact and form gametangia.
- The gametangia contain gametes which then fuse to form a zygote.
- This zygote undergoes meiosis to form haploid spores, which are dispersed to give rise to new fungi. A diagram should clearly label each of these stages.
Step 4
Give an example of a beneficial organism and of a harmful organism that belong to the same kingdom as Rhizopus.
Answer
A beneficial organism example is Penicillium which is used in the production of antibiotics, while a harmful organism example is Aspergillus which can cause diseases in plants and humans.