Characteristics of Life: MRS GREN

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Questions and Answers

Which of the following activities best demonstrates the characteristic of 'movement' in living organisms?

  • The release of energy from glucose during cellular respiration.
  • A sunflower bending its stem to face the sun. (correct)
  • A plant synthesizing glucose during photosynthesis.
  • The increased production of sweat on a hot day.

Which process directly involves the breakdown of nutrient molecules to release energy within cells?

  • Excretion
  • Reproduction
  • Respiration (correct)
  • Nutrition

A rabbit runs away when it sees a predator. Which characteristic of living organisms does this action exemplify?

  • Sensitivity (correct)
  • Excretion
  • Nutrition
  • Growth

Which of the following defines 'growth' as a characteristic of living organisms?

<p>A permanent increase in size and dry mass. (B)</p> Signup and view all the answers

Which of the following is the MOST accurate definition of a species?

<p>A group of organisms that can interbreed and produce fertile offspring. (D)</p> Signup and view all the answers

Why is the binomial system considered an 'internationally agreed system'?

<p>It provides a unique and standardized name for each organism, regardless of location or language. (C)</p> Signup and view all the answers

In the binomial name Panthera leo, what does Panthera represent?

<p>The genus of the organism. (A)</p> Signup and view all the answers

Which of the following lists represents the correct order of classification from broadest to most specific?

<p>Kingdom, Family, Genus, Species. (D)</p> Signup and view all the answers

Why is excretion considered essential for living organisms?

<p>It allows for the removal of toxic waste products of metabolism. (D)</p> Signup and view all the answers

How does 'nutrition' contribute to the survival of living organisms?

<p>By providing materials for energy, growth, and development. (D)</p> Signup and view all the answers

Flashcards

Movement

Movement is an action by an organism causing a change of position.

Respiration

Respiration is a chemical reaction in cells that release energy.

Sensitivity

Sensitivity is the ability to detect and respond to environmental changes.

Growth

Growth is a permanent increase in size and dry mass.

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Reproduction

Reproduction is the process by which organisms create offspring.

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Excretion

Excretion is the removal of metabolic waste products.

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Nutrition

Nutrition is the intake of materials for energy, growth, and development.

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Species

A group of organisms that can reproduce fertile offspring.

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Binomial System

A system of naming species with two parts: genus and species.

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Genus

A group of related species.

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Study Notes

  • MRS GREN is a mnemonic to remember the seven characteristics of living things.

Characteristics of Living Organisms (MRS GREN)

  • Movement involves a change of position or place.
  • Respiration involves chemical reactions which release energy for metabolism.
  • Sensitivity refers to detecting and responding to environmental changes.
  • Growth means a permanent increase in size and dry mass.
  • Reproduction creates more organisms of the same kind.
  • Excretion removes waste products of metabolism.
  • Nutrition involves taking in materials for energy, growth, and development.

Classification

  • Millions of species exist.
  • A species can reproduce fertile offspring.
  • Species are classified based on shared characteristics.
  • Mammals usually have hair and are warm-blooded.

Binomial System

  • Binomial system is an internationally agreed system for naming species.
  • Scientific name has two parts: genus and species.
  • Genus is a group of related species.
  • This system allows subdividing the organisms into smaller groups with more shared features.
  • Scientific name starts with capitalized genus, then lowercase species.

Hierarchical Classification

  • Living organisms are organized into a hierarchical system, which becomes more specific at each level.

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