Ecology Chapter 4 Test Review

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Questions and Answers

What is the primary source of energy in most ecosystems?

the sun

Who are the organisms most likely to belong to the same species?

people at a football game

Which of the following statements about an organism's habitat is not true?

  • Most organisms can survive if taken away from their habitat (correct)
  • Most organisms thrive in their habitat
  • Habitat influences behavior
  • Habitat provides necessary resources

Some organisms are more likely to survive because they:

<p>All of the above (D)</p> Signup and view all the answers

An organism is resistant to a chemical if it has:

<p>a gene that protects it from the chemical</p> Signup and view all the answers

What is the process of two species changing genetically in response to long-term interactions called?

<p>coevolution</p> Signup and view all the answers

For evolution to occur in a population, individuals with a trait that is naturally selected for must:

<p>reproduce</p> Signup and view all the answers

How many kingdoms do most scientists classify organisms into?

<p>six kingdoms</p> Signup and view all the answers

Which of the following animals is successful because it moves quickly, reproduces rapidly, and has a waterproof external skeleton?

<p>Ant (C)</p> Signup and view all the answers

Which organisms convert nitrogen in the air into a form plants can use?

<p>bacteria</p> Signup and view all the answers

Most land animals depend on angiosperms for:

<p>food</p> Signup and view all the answers

Which factors describe soil and temperature in an ecosystem?

<p>abiotic factors</p> Signup and view all the answers

What best describes a population?

<p>members of the same species living in the same place at the same time</p> Signup and view all the answers

One way that bacteria and fungi are important to the environment is that they:

<p>break down dead organisms</p> Signup and view all the answers

Which of the following is not a biotic factor in an ecosystem?

<p>Air (C)</p> Signup and view all the answers

Single-celled organisms with cell walls but no nuclei are called:

<p>bacteria</p> Signup and view all the answers

Which two kingdoms contain organisms that can use energy from the sun to make food?

<p>Protists and Plants (A)</p> Signup and view all the answers

Which of the following characteristics is usually shared by bacteria, fungi, and plants?

<p>They have cell walls (B)</p> Signup and view all the answers

A gymnosperm is a(n):

<p>plant</p> Signup and view all the answers

If an insect can no longer be killed by a particular insecticide, it has developed a(n) _______ to the chemical.

<p>resistance</p> Signup and view all the answers

Most bacteria belong to the kingdom:

<p>eubacteria</p> Signup and view all the answers

The initial source of food in most ocean and freshwater ecosystems is _____

<p>phytoplankton / algae protist</p> Signup and view all the answers

The initial source of food in most land ecosystems is _____

<p>angiosperms / plants</p> Signup and view all the answers

Pine trees and other conifers are classified as _____ because they are woody plants, the seeds of which are not enclosed in fruits.

<p>gymnosperms</p> Signup and view all the answers

The living and once living parts of an ecosystem, including all the plants and animals, are _____ factors in the ecosystem.

<p>biotic</p> Signup and view all the answers

The nonliving parts of an ecosystem, such as rocks, light, air, and temperature, are _____ factors in the ecosystem.

<p>abiotic</p> Signup and view all the answers

The place where an organism lives and has the resources it needs is called its:

<p>habitat</p> Signup and view all the answers

Darwin proposed that _______ is the mechanism for ________, the change in the genetic characteristics of a population from one generation to the next.

<p>natural selection, evolution</p> Signup and view all the answers

An inherited trait that increases an organism's chance of survival and reproduction in a certain environment is a(n) _____

<p>adaption</p> Signup and view all the answers

Bacteria are members of the _______ or _______ kingdoms.

<p>Archaebacteria and Eubacteria (A)</p> Signup and view all the answers

Unlike other organisms, _____ do not have cell nuclei.

<p>bacteria</p> Signup and view all the answers

Yeasts that make bread rise belong to the _____ kingdom.

<p>fungi</p> Signup and view all the answers

The one-celled organisms that cause malaria belong to the _____ kingdom.

<p>protist/protista</p> Signup and view all the answers

Many-celled organisms that have cell walls and make their own food are known as:

<p>plants</p> Signup and view all the answers

Match the two groups of plants based on their seed production:

<p>Gymnosperms = Produce seeds that are not in fruit Angiosperms = Produce flowers and bear seeds in fruit</p> Signup and view all the answers

Animals that lack backbones are called:

<p>invertebrates</p> Signup and view all the answers

Animals that have backbones are called:

<p>vertebrates</p> Signup and view all the answers

Athlete's foot is a disease caused by:

<p>fungi</p> Signup and view all the answers

Create your own definition of community using your local community as an example.

<p>A community has many populations within it.</p> Signup and view all the answers

Flashcards

Main Energy Source

Most ecosystems get their energy from this source.

What is a population?

Members of the same species living in a specific location at the same time.

What is a Habitat?

The natural place where an organism lives and thrives.

What is Natural Selection?

The process where advantageous traits become more common in a population over generations.

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What is Coevolution?

The process where two species genetically change due to long-term interactions with each other.

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What are Kingdoms?

A broad classification of life, scientists use six.

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What are Bacteria?

Single-celled organisms without nuclei, that break down dead organisms.

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What are Fungi?

A kingdom of organisms including yeasts and molds.

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What are Angiosperms?

Plants with seeds enclosed in fruits.

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What is Phytoplankton?

The main food source in most aquatic ecosystems.

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What is Adaptation?

An inherited trait that enhances survival and reproduction.

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What are Biotic Factors?

Living or once-living components of an ecosystem.

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What are Abiotic Factors?

Nonliving elements of an ecosystem, such as air, soil, and temperature.

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What are Invertebrates?

Animals without backbones.

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What are Vertebrates?

Animals with backbones.

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What is a Community?

Multiple populations interacting within a particular area.

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Study Notes

Energy Sources in Ecosystems

  • Most ecosystems derive their energy primarily from the sun.

Species and Population Dynamics

  • Organisms most likely belonging to the same species may be seen together, like people at a football game.
  • A population is defined as members of the same species living in a specific location at the same time.

Habitat and Survival

  • Organisms generally cannot survive if removed from their natural habitat.
  • Some organisms thrive due to specific physical traits, inherited behaviors, or a lack of certain traits.

Evolution and Natural Selection

  • Natural selection favors individuals with advantageous traits, who must reproduce for evolution to occur.
  • Coevolution occurs when two species change genetically due to long-term interactions.

Organism Classification

  • Scientists classify life into six kingdoms, including eubacteria and archaebacteria.
  • Organisms capable of photosynthesis are found in the protist and plant kingdoms.

Bacteria and Fungi

  • Bacteria play a crucial role in ecosystems by breaking down dead organisms.
  • Bacteria are categorized as single-celled organisms without nuclei, while fungi, such as yeasts, belong to a separate kingdom.

Plant Types

  • Angiosperms and gymnosperms are the two main groups of plants; gymnosperms bear seeds not enclosed in fruits, while angiosperms produce seeds within fruits.
  • Most land animals rely on angiosperms for food.

Food Sources in Ecosystems

  • Phytoplankton and algae serve as the foundational food source in most aquatic ecosystems, while angiosperms are primary for terrestrial ecosystems.

Organism Adaptations

  • Resistance to chemicals, such as insecticides, signifies that an organism has adapted genetically and developed protective traits.
  • An adaptation is an inherited trait that enhances an organism's chances of survival and reproduction in its environment.

Ecological Factors

  • Biotic factors encompass all living or once-living components of an ecosystem, including plants and animals.
  • Abiotic factors include nonliving elements like air, soil, temperature, and light.

Invertebrates and Vertebrates

  • Animals without backbones are classified as invertebrates, while those with backbones are known as vertebrates.

Community Dynamics

  • A community consists of multiple populations, including various organisms such as people, pets, insects, and plants, all interacting within a particular area.

Diseases and their Origins

  • Athlete's foot is a fungal infection, illustrating how fungi can impact human health.

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