Defining Life and Its Characteristics

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Questions and Answers

What is one characteristic that definitively identifies living organisms?

  • None of the characteristics can definitively identify life (correct)
  • Ability to grow larger than inanimate objects
  • Ability to move from one location to another
  • Ability to respond to environmental changes

How do living organisms obtain energy?

  • From the sunlight directly
  • Through photosynthesis alone
  • By consuming or absorbing substances (correct)
  • Only through respiration

Which of the following is not a characteristic of living organisms?

  • Reproduction
  • Growth and development
  • Combustion (correct)
  • Metabolism

What can contribute to the growth and development of living organisms?

<p>Natural changes during their life cycles (A)</p> Signup and view all the answers

How do plants demonstrate movement?

<p>By bending their leaves towards sunlight (A)</p> Signup and view all the answers

Which option best describes metabolism in living organisms?

<p>The transformation of substances for energy use (D)</p> Signup and view all the answers

Why is it challenging to define what constitutes life?

<p>No individual characteristic can solely define life. (B)</p> Signup and view all the answers

Which characteristic allows living organisms to interact with their surroundings?

<p>Responsiveness (B)</p> Signup and view all the answers

What type of organisms arise from other living things?

<p>All living organisms (D)</p> Signup and view all the answers

What distinguishes the movement of living organisms from inanimate objects?

<p>Living organisms can direct their movement in response to stimuli. (D)</p> Signup and view all the answers

Flashcards

Reproduction

The ability of a living organism to produce offspring.

Growth and Development

The process by which living organisms increase in size and change in form over time.

Metabolism

The sum of all chemical processes that occur within a living organism to maintain life.

Movement

The ability of a living organism to move, either internally or externally.

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Responsiveness

The ability of a living organism to react to changes in its environment.

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What is Metabolism?

The process of taking in substances, changing them, and releasing other substances, releasing energy for the organism.

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What defines a living organism?

A living organism, arising from other living organisms, exhibits a unique combination of features.

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Homeostasis

The ability of a living organism to maintain a stable internal environment.

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Evolution

The change in the genetic makeup of a population over time.

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Uncertainty in Identifying Life

The collective properties of living organisms are not definitive, but rather a strong indication.

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Study Notes

Defining Life

  • Life is a complex concept, not easily defined scientifically
  • Living things share common characteristics, but not all share every characteristic
  • Key characteristics are reproduction, growth, metabolism (using energy), and responsiveness

Reproduction

  • Living things always come from other living things
  • New life isn't created spontaneously
  • Plants, animals, and even organisms like bacteria reproduce in various ways

Growth and Development

  • Living things grow larger or change in form
  • This isn't just about size, includes changes in appearance, features.
  • All living organisms change and develop from infancy to maturity

Metabolism

  • Metabolism involves chemical processes for life
  • Living things take in and use energy from their environment
  • All living organisms obtain and process energy

Response to Stimuli

  • Living things respond to changes in their environment
  • They react and adapt to external stimuli, such as light, temperature changes, or location
  • Plants and animals both respond to changes in their environment

Uncertainty

  • Defining life isn't simple.
  • It can, however, be approximated by identifying specific characteristics.
  • Some characteristics are easier to observe than others, depending on whether the characteristic is present or absent

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