Finding the Antonym of Unfavourable

The question asks us to identify the most appropriate antonym (a word that means the opposite of another word) for the underlined word "unfavourable" in the given sentence.

The sentence is: "Darwin drew our attention to the gradual accumulation of unfavourable traits and its direct relationship with the survival of those presumed lucky species, which then serve as breeding grounds for more desirable traits."

Let's break down the meaning of "unfavourable" in this context and examine the options.

Understanding "Unfavourable"

• The word "unfavourable" is an adjective.
• It is formed by adding the prefix "un-" (meaning not) to the word "favourable".
• "Favourable" means showing approval, or giving a good chance of success; advantageous.
• Therefore, "unfavourable" means not favourable; disadvantageous; detrimental; disadvantageous; not good or likely to lead to success.
• In the context of biological traits and survival, an "unfavourable trait" is one that makes a species less likely to survive or reproduce successfully in its environment.

Analyzing the Options for the Antonym of Unfavourable

We are looking for a word that means the opposite of disadvantageous or detrimental in the context of survival.

1. advantageous: This word means providing an advantage or benefit; favourable. If a trait is advantageous, it helps a species survive or thrive. This is the direct opposite of an unfavourable (disadvantageous) trait.
2. fulfilling: This word means providing satisfaction or a sense of achievement. It relates to emotional or psychological states, not typically to the survival value of biological traits.
3. steady: This word means not changing or fluctuating; constant. It describes consistency or stability, not whether a trait is beneficial or detrimental for survival.
4. negative: This word can mean expressing denial or disagreement, or undesirable/harmful. In the context of traits, a "negative trait" is very similar in meaning to an "unfavourable trait". This is closer to a synonym than an antonym.

Identifying the Most Appropriate Antonym

Comparing the options, "advantageous" is the clearest and most appropriate antonym for "unfavourable" in the context of traits affecting survival. An unfavourable trait is a disadvantage, while its opposite, a favourable trait, is an advantage.

Conclusion on the Antonym of Unfavourable

Based on the meaning of "unfavourable" and the analysis of the given options, the word that is most opposite in meaning is "advantageous".

Revision Table: Key Vocabulary Concepts

Understanding the difference between synonyms and antonyms is crucial for vocabulary questions.

Additional Information: Traits and Natural Selection

The sentence mentions Darwin's ideas, which are related to the theory of evolution by natural selection. This theory explains how species change over time.

• Traits: Characteristics or attributes of an organism (e.g., fur colour, beak shape, speed).
• Variation: Individuals within a species have variations in their traits.
• Unfavourable Traits: Traits that make an organism less likely to survive and reproduce in its specific environment. Organisms with these traits are less likely to pass them on.
• Favourable (Advantageous) Traits: Traits that make an organism more likely to survive and reproduce. Organisms with these traits are more likely to pass them on to their offspring.
• Accumulation: Over generations, advantageous traits become more common in the population because the individuals possessing them survive and reproduce more successfully. Conversely, unfavourable traits become less common.
• Survival of the Fittest: This popular phrase relates to natural selection, meaning that those individuals best suited ("most fit") to their environment are most likely to survive and reproduce. The "fitness" here refers to reproductive success based on their traits.

The sentence correctly points out that unfavourable traits can accumulate, but it's the *removal* of individuals with these traits (and survival of those with favourable traits) that drives change in a population over time, leading to the prevalence of more desirable (favourable) traits.