An endangered species is a type of organism that is threatened by extinction. Species become endangered for two main reasons: loss of habitat and loss of genetic variation. A loss of habitat can happen naturally. Dinosaurs, for instance, lost their habitat about 65 million years ago. The hot, dry climate of the Cretaceous period changed very quickly, most likely because of an asteroid striking the Earth. The impact of the asteroid forced debris into the atmosphere, reducing the amount of heat and light that reached Earth’s surface. The dinosaurs were unable to adapt to this new, cooler habitat. Dinosaurs became endangered, then extinct. Human activity can also contribute to a loss of habitat. Development for housing, industry, and agriculture reduces the habitat of native organisms. This can happen in a number of different ways. Development can eliminate habitat and native species directly. In the Amazon rain forest of South America, developers have cleared hundreds of thousands of acres. To “clear” a piece of land is to remove all trees and vegetation from it. The Amazon rain forest is cleared for cattle ranches, logging, and urban use. Development can also endanger species indirectly. Some species, such as fig trees of the rain forest, may provide habitat for other species. As trees are destroyed, species that depend on that tree habitat may also become endangered. Tree crowns provide habitat in the canopy, or top layer, of a rainforest. Plants such as vines, fungi such as mushrooms, and insects such as butterflies live in the rain forest canopy. So do hundreds of species of tropical birds and mammals such as monkeys. As trees are cut down, this habitat is lost. Species have less room to live and reproduce. Based on the passage above choose the correct option for the following questions.
Which of the following word is the ANTONYM of the word ‘native’ used in the passage?
Exotic
Understanding 'Native' and Finding its Antonym
The question asks us to identify the word that is the antonym of 'native' as used in the provided passage about endangered species and habitat loss. An antonym is a word that has the opposite meaning of another word.
Analyzing the Usage of 'Native' in the Passage
In the passage, the word 'native' is used in the context of human activity contributing to habitat loss:
- "Development for housing, industry, and agriculture reduces the habitat of native organisms."
- "Development can eliminate habitat and native species directly."
'Native organisms' or 'native species' refers to the plants and animals that originally belong to or are naturally found in a specific area or habitat.
Evaluating the Options for the Antonym of 'Native'
Let's look at the given options and determine which one has the opposite meaning of 'native' in this context:
- Option 1: Original
The word 'original' often means existing from the beginning or earliest stage. While 'native' species are the original inhabitants of a place, 'original' itself is not an antonym; it is often synonymous or closely related in meaning. - Option 2: Domestic
'Domestic' typically refers to things related to a home, family, or country, or animals that have been tamed and kept by humans. While some domestic animals might be native to a country, 'domestic' does not universally mean 'not native'. It doesn't convey the opposite meaning of belonging to a specific place by nature. - Option 3: Exotic
'Exotic' means originating in or characteristic of a distant foreign country. When talking about species, an 'exotic species' is one that has been introduced to an area where it does not naturally belong. This is the direct opposite of a 'native species' which naturally belongs to the area. - Option 4: Born
'Born' relates to the act of being brought into existence. 'Native' often implies being 'born' in a particular place. This word is related to the meaning of 'native' but is not an antonym.
Identifying the Correct Antonym
Based on the analysis, the word 'exotic' is the direct opposite of 'native' when describing organisms or species in a particular place. A native species is from that place, while an exotic species is from somewhere else and has been introduced.
Understanding Vocabulary in Context
It's important to understand the meaning of words like 'native' and 'exotic' when discussing biodiversity, ecology, and conservation. Native species are crucial to the balance of an ecosystem, whereas exotic species can sometimes become invasive and disrupt the native environment.
| Word | Meaning in Context | Relationship to 'Native' |
|---|---|---|
| Native | Belonging naturally to a place | Base word |
| Original | Existing from the start | Similar meaning (sometimes) |
| Domestic | Related to home/country; Tamed | Different concept |
| Exotic | Foreign; Not native | Antonym |
| Born | Brought into existence | Related meaning |
Therefore, the word that is the antonym of 'native' as used in the passage is 'Exotic'.
Revision Table: Key Terms from the Passage
| Term | Meaning |
|---|---|
| Endangered Species | Organism threatened by extinction |
| Extinction | Complete disappearance of a species |
| Habitat | Natural home or environment of an organism |
| Genetic Variation | Differences in DNA among individuals of a species |
| Native Species | Species that originate and live naturally in a particular area |
| Exotic Species | Species introduced to an area where it does not naturally occur (Antonym of Native) |
| Canopy | The upper layer of trees in a forest |
Additional Information: Causes of Endangerment
The passage highlights two main reasons for species becoming endangered: loss of habitat and loss of genetic variation. Let's briefly look at these and related concepts:
- Loss of Habitat: This is a primary driver of species endangerment. It occurs when an organism's living space is destroyed or degraded. Causes include deforestation (as mentioned with the Amazon), urbanization, pollution, climate change, and natural disasters. When habitat is lost, species lose their food sources, shelter, and breeding grounds, making survival difficult.
- Loss of Genetic Variation: This happens when the gene pool within a species shrinks. A small population size, habitat fragmentation, or inbreeding can reduce genetic diversity. Low genetic variation makes a species less adaptable to environmental changes (like the dinosaurs mentioned in the passage) and more susceptible to diseases.
- Invasive Species: While not explicitly listed as a main reason in the passage, the introduction of exotic or non-native species can also be a major threat to native species and cause endangerment. Invasive species can outcompete native species for resources, prey on them, or spread diseases.
- Overexploitation: Activities like overfishing, hunting, and logging can reduce the numbers of a species to dangerously low levels, leading to endangerment.
Understanding these factors helps explain why conservation efforts are crucial for protecting biodiversity and preventing extinction.
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