Biology Ecology and Evolution 1 — Questions and Answers
Question 1: What is a food chain?
- A group of organisms living together in harmony
- A series of steps in which organisms transfer energy by eating and being eaten (Correct answer)
- The flow of energy from the sun to plants
- The movement of nutrients in the soil
Correct answer: A series of steps in which organisms transfer energy by eating and being eaten
A food chain illustrates the linear pathway of energy flow through an ecosystem, showing how organisms transfer energy by consuming and being consumed. It begins with producers (like plants) and moves through various consumers (herbivores, carnivores), demonstrating the trophic levels and the interconnectedness of species in an ecosystem.
Question 2: What term describes a species’ role in its environment?
- Habitat
- Niche (Correct answer)
- Community
- Ecosystem
Correct answer: Niche
A species' niche encompasses its entire role and position within an ecosystem, including its interactions with other species, its resource requirements, and its impact on the environment. It describes not just where a species lives (its habitat), but also what it does, how it obtains food, and how it contributes to the ecosystem's balance.
Question 3: Which process drives evolution by favoring individuals with advantageous traits?
- Mutation
- Natural Selection (Correct answer)
- Genetic Drift
- Artificial Selection
Correct answer: Natural Selection
Natural selection is the primary mechanism of evolution, where individuals with traits better suited to their environment are more likely to survive, reproduce, and pass on those advantageous traits. Over successive generations, this differential survival and reproduction leads to an increase in the frequency of beneficial traits within a population, driving evolutionary change.
Question 4: What type of relationship exists between two species where both benefit?
- Parasitism
- Commensalism
- Mutualism (Correct answer)
- Competition
Correct answer: Mutualism
Mutualism is a type of symbiotic relationship where both interacting species benefit from their association. This reciprocal benefit can manifest in various ways, such as enhanced nutrient acquisition, protection from predators, or improved reproductive success for both organisms involved.
Question 5: What is the primary driver of biodiversity loss today?
- Climate change
- Habitat destruction (Correct answer)
- Overpopulation of predators
- Increased rainfall
Correct answer: Habitat destruction
Habitat destruction is widely recognized as the leading cause of biodiversity loss globally. When natural habitats are converted for human uses like agriculture, urbanization, or resource extraction, species lose their homes, food sources, and breeding grounds, leading to population declines, fragmentation, and ultimately, extinctions.
Biology Ecology and Evolution 1
What is a food chain?