Chapter 11: Problem 6
Which of the following is a reproductive method parasites use to overcome their death during transfer one host to another? (a) Schizogony (multiple cell fission) (b) Hermaphrodite (both sexes found within one organism) (c) Production of large numbers of eggs (d) \(a, b\), and \(c\) (e) a and \(c\)
Short Answer
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Understanding Reproductive Methods
Analyzing Options
Comparing with Options
Conclusion
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Schizogony
The advantage of schizogony is speed. It allows parasites to rapidly increase their numbers. This is crucial for their survival, especially during the transmission between hosts. More parasites mean a better chance that at least some will find a suitable new host.
How schizogony works:
- A parasite's nucleus divides multiple times.
- Cytoplasm is segmented, each containing a nucleus.
- New cells - called merozoites - are formed.
Hermaphroditism
This adaptation is particularly beneficial for organisms that have fewer chances of encountering a mate. While hermaphroditism itself isn't primarily a strategy against the perils of host-to-host transfer, it provides flexibility in reproduction.
In parasitic contexts, self-fertilization can prove advantageous, but it doesn't directly solve the problem of transferring from one host to another.
How hermaphroditism helps:
- Increased capability for self-reproduction.
- Adaptation to environments with scarce mates.
- Ability to maximize reproductive success.
Egg Production
This approach essentially plays a numbers game, maximizing chances for success. It is particularly effective for parasites that have complex life cycles requiring passage through multiple hosts.
Why producing many eggs is beneficial:
- Spreads risk among numerous potential offspring.
- Increases chances of encountering a suitable host.
- Offsets high mortality rates during transfer.
Asexual Reproduction
For parasites, asexual reproduction can be paired with methods like schizogony to rapidly increase numbers, offering significant survival advantages. Since it doesn’t rely on finding a mate, it can be accomplished swiftly and efficiently.
Advantages of asexual reproduction:
- Rapid population growth.
- No need for a mate, saving energy and time.
- Ensures genetic consistency in stable environments.