The Dynamics of Diffusion in Living Organisms

The video explains Brownian motion and diffusion, highlighting how particles move randomly, driven by kinetic energy. It discusses diffusion in cells, its importance in waste removal, nutrient acquisition, and gaseous exchange. Examples include alveoli in lungs and plant leaves. Factors influencing diffusion, such as distance, temperature, and concentration gradient, are also covered.

What is the source of energy for diffusion?

• Kinetic energy from random movement

• Potential energy of molecules

• Chemical energy from reactions

• Thermal energy from the environment

How does diffusion help organisms?

• By increasing cell size

• By creating new cells

• By producing energy

• By removing waste products

What is the primary function of diffusion in respiration?

• To create new cells

• To store energy

• To exchange gases

• To produce glucose

In the alveoli, which direction does oxygen diffuse?

• From alveoli to blood

• From blood to alveoli

• From environment to alveoli

• From alveoli to environment

What is the role of stomata in plant leaves?

• To produce glucose

• To store water

• To facilitate gas exchange

• To absorb sunlight

What happens during guttation in plants?

• Carbon dioxide is released

• Oxygen is absorbed

• Water vapor is released

• Water vapor is absorbed

Which factor increases the rate of diffusion when it is higher?

• Distance

• Temperature

• Molecular size

• Pressure

What effect does a larger concentration gradient have on diffusion?

• Reverses the direction

• Decreases the rate

• Increases the rate

• Has no effect

What is the relationship between distance and diffusion rate?

• Shorter distance decreases rate

• Shorter distance increases rate

• Distance has no effect

• Longer distance increases rate

Which of the following is NOT a factor influencing diffusion?

• Distance

• Temperature

• Concentration gradient

• Color of molecules