Podcast
Questions and Answers
What percentage of the energy of sunlight that falls on the leaves of green plants is converted into food energy?
What percentage of the energy of sunlight that falls on the leaves of green plants is converted into food energy?
- 10%
- 1% (correct)
- 25%
- 5%
Why do food chains generally consist of only three or four steps?
Why do food chains generally consist of only three or four steps?
- Because producers are not present beyond the fourth trophic level.
- Because more energy is available at higher trophic levels.
- Because each trophic level retains most of the energy it receives.
- Because each trophic level loses a large amount of energy as heat to the environment. (correct)
What is the average percentage of food eaten by primary consumers that is turned into their own body and made available for the next level of consumers?
What is the average percentage of food eaten by primary consumers that is turned into their own body and made available for the next level of consumers?
- 10% (correct)
- 5%
- 20%
- 15%
Why are there generally a greater number of individuals at the lower trophic levels of an ecosystem?
Why are there generally a greater number of individuals at the lower trophic levels of an ecosystem?
Why are food chains often represented as a series of branching lines known as a food web?
Why are food chains often represented as a series of branching lines known as a food web?
Why does very little usable energy remain after four trophic levels in a food chain?
Why does very little usable energy remain after four trophic levels in a food chain?
What is the main characteristic of the flow of energy in ecosystems according to the text?
What is the main characteristic of the flow of energy in ecosystems according to the text?
What happens to the energy available at each trophic level as it progresses through the food chain?
What happens to the energy available at each trophic level as it progresses through the food chain?
How do harmful chemicals enter our bodies through the food chain?
How do harmful chemicals enter our bodies through the food chain?
What role do autotrophs play in the energy flow diagram in ecosystems?
What role do autotrophs play in the energy flow diagram in ecosystems?
How do pesticides and chemicals used in agriculture affect ecosystems?
How do pesticides and chemicals used in agriculture affect ecosystems?
What happens to the energy after passing through various trophic levels?
What happens to the energy after passing through various trophic levels?
What is the role of autotrophs in a food chain?
What is the role of autotrophs in a food chain?
Where do herbivores typically belong in a food chain?
Where do herbivores typically belong in a food chain?
What happens to the energy in a food chain as it moves from autotrophs to heterotrophs?
What happens to the energy in a food chain as it moves from autotrophs to heterotrophs?
Which trophic level do larger carnivores belong to in a food chain?
Which trophic level do larger carnivores belong to in a food chain?
What is the term for a series of organisms feeding on one another in an ecosystem?
What is the term for a series of organisms feeding on one another in an ecosystem?
What is the main source of energy for activities in the living world?
What is the main source of energy for activities in the living world?
