Living vs. Non-Living Things: Examples for 9th Grade Biology

Hello Future Biologist!

Absolutely! It's smart to get a solid grasp on the fundamentals. Differentiating between living and non-living things is a cornerstone of biology. Here's a quick study guide to refresh your memory, followed by a practice quiz to test your understanding. Good luck with your exam!

Quick Study Guide

Understanding the difference between living and non-living things is fundamental in biology. Living things, also known as organisms, exhibit a set of unique characteristics that distinguish them from non-living matter.

• Characteristics of Life: Biologists often use a set of criteria to define life. While specific lists can vary, common characteristics include:
  • Organization: All living things are highly organized, with cells as their basic unit.
  • Metabolism: They obtain and use energy (nutrition) to carry out chemical processes (respiration) and remove waste products (excretion).
  • Growth and Development: Living things increase in size and/or complexity over their lifespan.
  • Reproduction: They produce offspring, passing on genetic material.
  • Response to Stimuli (Sensitivity): They react to changes in their environment.
  • Homeostasis: They maintain a stable internal environment.
  • Adaptation/Evolution: Populations of living things can evolve over generations.
• Cells: The Basic Unit: All living organisms are made of one or more cells. Non-living things lack cellular structure.
• Examples:
  • Living: Plants, animals, fungi, bacteria, protists (e.g., humans, trees, mushrooms, amoebas).
  • Non-Living: Rocks, water, air, minerals, fire, robots, sunlight, computers, cars.
• Special Cases (Viruses): Viruses are often considered on the border of living and non-living. They can reproduce and evolve but require a host cell to carry out metabolic processes and lack a cellular structure themselves.

Practice Quiz

1. What is the fundamental unit of organization for all known living organisms?

   1. Molecule
   2. Atom
   3. Cell
   4. Tissue

2. Which of the following characteristics is essential for a species to continue existing over generations?

   1. Homeostasis
   2. Metabolism
   3. Reproduction
   4. Sensitivity

3. From the options below, which one is considered a living thing?

   1. A crystal
   2. A bacterium
   3. A river
   4. A robot

4. Which of these would be classified as non-living?

   1. A mushroom
   2. A seed
   3. A cloud
   4. An earthworm

5. A seedling using sunlight to grow taller and produce new leaves is primarily demonstrating which characteristic of life?

   1. Sensitivity
   2. Excretion
   3. Growth
   4. Reproduction

6. Viruses are often considered to be on the border of living and non-living because they:

   1. Have a cell membrane but no nucleus.
   2. Can reproduce and evolve but require a host cell for metabolism.
   3. Are made of cells but do not grow.
   4. Respond to stimuli but cannot excrete waste.

7. A rock, unlike a rabbit, does not possess which of the following combined characteristics?

   1. Growth and movement
   2. Cellular structure and metabolism
   3. Sensitivity and organization
   4. All of the above