Cell Transport Mechanisms and Processes

This video from IGCSE Study Buddy covers the movement of substances into and out of cells, focusing on diffusion, osmosis, and active transport. It explains how diffusion involves the movement of particles down a concentration gradient, osmosis is the movement of water molecules through a partially permeable membrane, and active transport requires energy to move particles against a concentration gradient. The video also discusses factors affecting diffusion and the importance of water potential in osmosis.

Which of the following processes involves the movement of water molecules through a partially permeable membrane?

• Facilitated Diffusion

• Active Transport

• Osmosis

• Diffusion

What factor does NOT affect the rate of diffusion?

• Temperature

• Concentration gradient

• Color of the particles

• Surface area

In diffusion, particles move from an area of _____ concentration to an area of _____ concentration.

• lower; higher

• equal; equal

• random; random

• higher; lower

What is the term used to describe the potential energy of water in a solution?

• Water concentration

• Hydrostatic pressure

• Water potential

• Osmotic pressure

Which of the following is NOT a characteristic of osmosis?

• Occurs through a partially permeable membrane

• Involves water potential

• Requires energy from respiration

• Movement of water molecules

What happens to a plant cell when it is placed in a concentrated solution?

• It becomes plasmolysed

• It becomes turgid

• It bursts

• It remains unchanged

Which process allows cells to absorb nutrients against a concentration gradient?

• Active Transport

• Osmosis

• Facilitated Diffusion

• Diffusion

Active transport requires energy from which cellular process?

• Photosynthesis

• Respiration

• Fermentation

• Glycolysis

Which of the following is true about active transport?

• It does not require energy

• It uses protein carriers

• It moves particles down a concentration gradient

• It only occurs in plant cells

What role do protein carriers play in active transport?

• They facilitate osmosis

• They create a concentration gradient

• They capture and transport molecules across the membrane

• They provide energy for the process