Surface Area to Volume Ratio

• What concept is being explained in the video regarding organisms?


  The video explains the surface area to volume ratio and its implications for organisms.
• Why can single-celled bacteria rely on diffusion for substance exchange?


  Because they have a high surface area to volume ratio.
• What do large multicellular organisms require for substance exchange?


  They require specialized exchange surfaces and transport systems.
• What are examples of specialized exchange surfaces in humans?


  The lungs and intestines.
• What resources do single-celled organisms need to absorb from their surroundings?


  Oxygen, glucose, and amino acids.
• What waste product do single-celled organisms need to eliminate?


  Carbon dioxide.
• How does the surface area to volume ratio change as organisms get larger?


  The surface area to volume ratio decreases.
• How do you calculate the surface area of a cube?


  • Calculate the area of one face: length × width
  • Multiply by 6 (since a cube has six faces)
• What is the surface area of a 1 cm x 1 cm x 1 cm cube?


  6 square centimeters.
• What is the volume of a 1 cm x 1 cm x 1 cm cube?


  1 cubic centimeter.
• For a medium cube, what is the surface area and volume?


  Surface area is 24 square centimeters and volume is 8 cubic centimeters.
• What is the surface area to volume ratio for the medium cube?


  3 to 1.
• For the largest cube, what are its surface area and volume?


  Surface area is 54 square centimeters and volume is 27 cubic centimeters.
• What is the surface area to volume ratio for the largest cube?


  2 to 1.
• How does the increase in size affect the surface area and volume of cubes?


  Volume increases more quickly than surface area as size increases.
• Why can't humans rely solely on diffusion for substance exchange?


  Because they have a low surface area to volume ratio.
• What structures in the lungs increase the surface area for gas exchange?


  Alveoli.
• What structures in the intestines increase the surface area for nutrient absorption?

  Villi.
• How does the diffusion distance change as organisms get larger?


  The diffusion distance increases significantly.
• How much further do molecules have to diffuse in humans compared to bacteria?


  Molecules diffuse 50,000 times further in humans.
• What transport system do larger organisms often have to assist with substance transport?

  The circulatory system.
• What are the specialized exchange surfaces and transport systems in plants?


  • Roots for substance exchange
  • Leaves for gas exchange
  • Phloem and xylem for transport
• What does the term "large organisms" refer to in the context of this video?


  It refers to any organism big enough to see with the naked eye.
• Who is the presenter of the video?

  Amadeus.
• What does the learning platform mentioned in the video offer?


  It offers videos, practice questions, and progress tracking for sciences and maths.
• Is the learning platform mentioned in the video free?

  Yes, it is completely free.
• Where can viewers find the link to the lesson for this video?

  In the description down below.
• What is the purpose of the playlist mentioned in the video?


  To arrange all the videos for the subject.