Biology: Characteristics of Life

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Questions and Answers

Which characteristic of life describes the ability of living organisms to adjust to environmental changes?

  • Response to stimuli (correct)
  • Complex structure
  • Homeostasis
  • Metabolism

What is the primary purpose of homeostasis in living organisms?

  • To produce energy
  • To maintain stable internal conditions (correct)
  • To reproduce effectively
  • To respond to stimuli

Which process is responsible for converting sunlight into chemical energy in plants?

  • Cell respiration
  • Fermentation
  • Metabolism
  • Photosynthesis (correct)

Which of the following is NOT a skin receptor mentioned in the content?

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

Which substance is known as the energy currency of cells?

<p>Adenosine triphosphate (D)</p> Signup and view all the answers

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Study Notes

Characteristics of Life

  • Living things exhibit a complex and organized structure, indicating advanced biological organization.
  • Responsiveness to stimuli is a fundamental trait of living organisms, allowing them to react to environmental changes.
    • Skin contains specialized receptors:
      • Pacinian Corpuscle detects deep pressure.
      • Meissner’s Corpuscle senses touch.
      • Ruffini’s End Organ responds to heat.
      • Krause’s Bulb recognizes cold.
      • Bare Nerve Endings are sensitive to pain.

Homeostasis

  • Homeostasis refers to the ability of living organisms to maintain a stable internal environment despite external changes.
    • Examples of homeostatic processes include the regulation of body temperature and blood sugar levels.

Metabolism

  • Living organisms acquire materials and energy from their surroundings, converting them into usable forms through metabolism.
    • Photosynthesis demonstrates this process:
      • Equation: 6CO2 + 6H2O + light energy → C6H12O6 + 6O2.
    • Organisms utilize ATP (adenosine triphosphate) as an energy currency for biological processes.
  • Decomposers, also known as detritivores, play a crucial role in the ecosystem by breaking down dead organic material and recycling nutrients.

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