Topic 3: Revision

What is the dotted line in the middle represented in this diagram?

• Concentration Gradient

• Partially Permeable Membrane

• Fully Permeable Membrane

• Cell Membrane

Which one of the molecules can pass through the dotted line freely?

• Small molecules

• Big molecules

• Both small and big molecules

• None

The equation for photosynthesis is as follows:

Water + Carbon dioxide -----> Oxygen gas + Glucose.

There are two components left in the equation. One is sunlight. What is the other one

How does oxygen gas escape from the leaf into the atmosphere?

• Oxygen escapes via the stomata.

• Oxygen is transported into roots by the xylem vessels.

• The plant uses the oxygen for respiration.

• Oxygen is converted to carbon dioxide by photosynthesis.

What is the process for when water molecules move from a region of high water potential to a region of low water potential down a concentration gradient through a partially permeable membrane?

Draw a normal plant cell. Use green for chloroplast and black for everything else.

Which term is meant by the "movement of molecules from a region of low concentration to a region of high concentration against the concentration gradient."?

Why the does photosynthesis mostly occur in the palisade mesophyll cell?

Draw a root hair cell. No need to label.

Draw the movement of water molecules when osmosis takes place.