Select the option that can be used as a one-word substitute for the given group of words. A creature which depends on others
Parasite
Understanding Creatures That Depend on Others
The question asks for a single word that describes a creature which relies on others for survival. In biology, there are specific terms for different types of relationships between organisms.
Analyzing the Options for Dependence
Let's examine each option provided:
- Microbes: This is a broad term for microscopic organisms, including bacteria, viruses, and some fungi or protists. While some microbes might depend on other organisms (like pathogenic bacteria or viruses), the term itself doesn't specifically mean 'depends on others'. Many microbes are free-living.
- Virus: A virus is a microscopic infectious agent that replicates only inside the living cells of other organisms. Viruses are obligate parasites, meaning they absolutely depend on host cells to reproduce. While a virus fits the description of depending on others, it is a specific type of organism, and 'parasite' is a broader term that covers many different life forms (from viruses to animals) that depend on others.
- Parasite: A parasite is an organism that lives on or inside another organism (called a host) and benefits from deriving nutrients at the host's expense. This definition perfectly matches the description "A creature which depends on others" in the context of obtaining resources for survival.
- Bacteria: Bacteria are a large domain of single-celled microorganisms. Many bacteria are free-living and produce their own food or decompose organic matter. Some bacteria are symbiotic (living with others for mutual benefit), and some are pathogenic (causing disease by depending on a host), but the term 'bacteria' itself does not imply dependence on others; it refers to the type of organism.
Identifying the One-Word Substitute
Based on the definitions, the term that most directly and broadly describes "A creature which depends on others" for its sustenance and survival, often to the detriment of the other creature (the host), is a parasite.
| Term | Definition | Does it mean 'depends on others'? |
|---|---|---|
| Microbes | Microscopic organisms | Not necessarily; many are free-living. |
| Virus | Replicates only in host cells | Yes, they depend on others, but 'parasite' is a broader term for this relationship. |
| Parasite | Lives on or inside another organism and benefits at the host's expense | Yes, this is the primary characteristic. |
| Bacteria | Single-celled microorganisms | Not necessarily; many are free-living or symbiotic. |
Therefore, the most appropriate one-word substitute for "A creature which depends on others" is Parasite.
Revision Table: Understanding Biological Dependence
| Key Term | Relation to Dependence |
|---|---|
| Parasite | Directly depends on a host organism for survival, often causing harm. |
| Host | The organism that a parasite lives on or in. |
| Symbiosis | A close and long-term interaction between two different biological species. |
| Mutualism | A type of symbiosis where both organisms benefit. |
| Commensalism | A type of symbiosis where one organism benefits and the other is neither harmed nor helped. |
| Parasitism | A type of symbiosis where one organism (the parasite) benefits at the expense of the other (the host). |
Additional Information on Dependence in Biology
Organisms interact with each other in many ways. Dependence is a key aspect of many biological relationships. While 'parasitism' describes one specific type of dependence (where one organism benefits and the other is harmed), other relationships also involve dependence:
- Predation: A predator depends on its prey for food, but it usually kills the prey. This is different from parasitism where the parasite typically keeps the host alive for a period.
- Symbiosis: This term covers any close, long-term interaction between different species. Parasitism is one type of symbiosis, but mutualism (like bees depending on flowers for nectar while helping pollination) and commensalism (like barnacles depending on whales for transport) are others where dependence exists, but the nature of the benefit/harm differs.
- Obligate vs. Facultative Dependence: Some organisms are obligate dependents, meaning they cannot survive without their host or partner (like viruses). Others are facultative, meaning they can survive independently but may choose to live with a host under certain conditions. Parasites can be either obligate or facultative.
The term 'parasite' is the most fitting general description for a creature whose defining characteristic is its dependence on another organism for survival resources.
Important Questions from One Word Substitution
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