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Answer the following questions in relation to sexual reproduction in the mould Rhizopus - Leaving Cert Biology - Question (c) - 2012
Question (c)
Answer the following questions in relation to sexual reproduction in the mould Rhizopus. 1. Sexual reproduction in Rhizopus is normally triggered by an adverse envi... show full transcript
Worked Solution & Example Answer:Answer the following questions in relation to sexual reproduction in the mould Rhizopus - Leaving Cert Biology - Question (c) - 2012
Step 1
1. Sexual reproduction in Rhizopus is normally triggered by an adverse environmental stimulus. Suggest one such stimulus.
Answer
One common environmental stimulus that triggers sexual reproduction in Rhizopus is dehydration. Under conditions of low water availability, Rhizopus may undergo sexual reproduction to ensure survival.
Step 2
2. Draw diagrams to show the main events of sexual reproduction in Rhizopus. In your diagrams label three structures other than the zygospore.
Answer
In the diagrams, depict the following:
- Progametangia: Structures that form prior to mating.
- Gametangia: Where the fusion of gametes occurs.
- Hypha: The filamentous structure that makes up the mycelium. Each diagram should clearly label these structures to demonstrate their role in the sexual reproduction process.
Step 3
3. Give two advantages to Rhizopus of zygospore formation.
Answer
- Zygospore formation allows Rhizopus to survive harsh environmental conditions, such as drought, by entering a dormant state.
- The zygospore can disperse and grow into new individuals when conditions become favorable again, ensuring the continuation of the species.
Step 4
Step 5
Step 6
3. How does asexual reproduction in Rhizopus differ from that in yeast?
Answer
Asexual reproduction in Rhizopus primarily occurs through the formation of spores, whereas yeast reproduces by budding. Additionally, Rhizopus produces spore structures, which aid in dispersal and survival, while yeast results in the direct growth of new cells from the parent cell.