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Chapter 35: Problem 5

Some bacterial species can use nitrogen directly from the atmosphere. In this situation, the bacteria are a _____. a. biotic factor b. abiotic factor c. predator d. symbiotic partner

Short Answer

Expert verified
a. biotic factor

Step by step solution

01

Identify the term related to bacteria in the question

The question suggests that some bacterial species can use nitrogen directly from the atmosphere. Identify which option best fits this description within the context of ecological roles.
02

Understand the meaning of each option

a. Biotic factor - living components of an ecosystem. b. Abiotic factor - non-living physical and chemical elements of an ecosystem. c. Predator - an organism that hunts and consumes another organism. d. Symbiotic partner - an organism that lives in close association with another different organism, often providing mutual benefits.
03

Analyze the role of bacteria

Bacteria using nitrogen directly from the atmosphere are living organisms that interact with their environment. Thus, they fit into the category of a living component.
04

Determine the correct answer

Based on the analysis, the bacteria qualify as a biotic factor since they are living organisms contributing to the nitrogen cycle in an ecosystem.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

nitrogen-fixing bacteria
Nitrogen-fixing bacteria are unique microorganisms that can transform nitrogen gas from the atmosphere into compounds like ammonia. This process is vital because most plants and animals cannot use nitrogen gas directly. Without nitrogen-fixing bacteria, ecosystems would be short of the nitrogen necessary for critical biological molecules like DNA and proteins. These bacteria typically live in soil or the roots of certain plants, called legumes.

Roots of legumes, such as beans and peas, have nodules where these bacteria reside.
The transformation of nitrogen by these bacteria supports plant growth.
This is a symbiotic relationship because both the bacteria and the plants benefit.
Understanding nitrogen-fixing bacteria helps us appreciate their crucial role in the nitrogen cycle, underlining their importance in ecosystems.
symbiotic relationships
Symbiotic relationships occur when two different organisms live together in close association. These relationships can be beneficial for one or both parties involved. Some common types include:
Mutualism: Both organisms benefit from the relationship. For example, nitrogen-fixing bacteria and legume plants.
Commensalism: One organism benefits, and the other is neither helped nor harmed. For example, barnacles attaching to a whale.
Parasitism: One organism benefits at the expense of the other, such as a tapeworm in a mammal's intestine.
The relationship between nitrogen-fixing bacteria and legumes is mutualistic. The bacteria get a place to live and nutrients from the plant, while the plant gains accessible nitrogen to fuel its growth. Understanding these relationships helps us see how interconnected life forms are within ecosystems.
ecosystem components
An ecosystem consists of both biotic and abiotic components. Biotic components are living elements like plants, animals, and microorganisms. Abiotic components include non-living aspects like soil, water, and air.

Biotic factors directly or indirectly affect each other. For example, plants provide food for herbivores.
Abiotic factors can regulate the living conditions in an ecosystem. For example, the pH level of soil can affect plant growth.
Both types of components are vital for maintaining the balance and function of an ecosystem.
For instance, nitrogen-fixing bacteria are biotic factors that impact plant growth, which in turn affects herbivores and the entire food chain.
Understanding these components helps us appreciate the delicate balance required to sustain healthy ecosystems.

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Most popular questions from this chapter

If algae grows out of proportion as seen during algal blooms, how does it affect the ecosystem? a. Photosynthetic organisms will not be able to grow. The animals and birds that live on those organisms will be affected. As the algae die, oxygen will be depleted, affecting fish and other aquatic animals. The pH of water will change, affecting metabolic processes as well. b. Non-photosynthetic organisms will not be able to grow due to lack of light. The photosynthetic organisms that require them to live will be affected. As the algae die, oxygen will be depleted, affecting fish and other aquatic animals. The pH of water will change, affecting metabolic processes as well. c. Photosynthetic organisms will not be able to grow. The animals and birds that live on those organisms will be affected. As the algae die, carbon dioxide will be depleted, affecting fish and other aquatic animals. The pH of water will change, affecting metabolic processes as well. d. Non-photosynthetic organisms will not be able to grow. The animals and birds that live on those organisms will be affected. As the algae die, carbon dioxide will be depleted, affecting fish and other aquatic animals. The pH of water will change, affecting metabolic processes as well.

All of the following are natural factors have led to slow increases in global temperatures except____. a. volcanic eruptions b. change in solar intensity c. earthquakes d. changes in the earth鈥檚 orbit

Why is it essential for organisms to maintain a constant body temperature? Describe adaptations that help the organisms cope with changes in environmental temperature. a. The rate of metabolic processes increases at very high or low temperatures. So, organisms have to maintain a constant body temperature. This can be achieved only by migration to avoid seasonal temperature changes. b. Enzymes that carry out metabolic processes are denatured at very high temperatures. So, organisms have to maintain a constant body temperature. This can be achieved by hibernation, aestivation, or migration. c. The rate of metabolic processes increases at very high or low temperatures. So, organisms have to maintain a constant body temperature. This can be achieved by hibernation, aestivation, or migration. d. Enzymes that carry out metabolic processes are denatured at very high temperatures. So, organisms have to maintain a constant body temperature. This can be achieved only by migration to avoid seasonal temperature changes.

What happens to aquatic life in deep lakes when water freezes during the winter months? a. During winters, layer of ice falls on water surface as it is less dense than water. Water is densest at \(7^{\circ} \mathrm{C}\) and retains its liquid form below the water surface. The aquatic life can exist in liquid water. b. During winters, the aquatic life exists in liquid water, which is present below the surface layer, by consuming more resources so they can survive during the harsh winter season. c. During winters, a layer of ice forms on the water surface, as ice is less dense than water. Water is densest at \(4^{\circ} \mathrm{C}\) and retains its liquid form below the water surface, where the ice layer is. In liquid water, the aquatic life can survive using the resources available. d. During winters, ice forms only on the surface and a few meters below the surface of water. Water is densest at \(4^{\circ} \mathrm{C}\) and retains its liquid form below the water surface, where the ice layer is. In liquid water, the aquatic life can exist using the resources available.

In a forest fire, many oak trees were destroyed. After the fire, numerous taller trees replaced the oak trees. What is the best explanation of this event? a. The tall trees grow faster and create a canopy, which did not allow oak trees to grow. b. The burning of the trees changed the pH of the soil, which did not allow oak to grow. c. Roots of shrubs and trees proliferate, taking over the place of the oak trees. d. Oak trees succumb to pests, thus other pest resistant trees are able to proliferate.
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