S4 structure of a leaf

The water needed for photosynthesis comes into the leaves through the

• waxy layer

• stomata

• guard cells

• xylem cells

The important gases, carbon dioxide and oxygen, enter and leave the leaf through the

• waxy layer

• phloem

• stomata

• guard cells

Which structures open and close stomata to allow gas exchange but prevent water loss in leaves?

• Chloroplasts

• Waxy layer

• Guard cells

• Palisade layer

The vascular tissue which transports sugar (food) in both directions within the leaf is the

• xylem

• phloem

• waxy layer

• chloroplast

The leaf has a shiny, waxy cuticle around it to

• increase the rate of photosynthesis
• attract more light
• control water loss
• stop carbon dioxide and oxygen gases escaping

Most of the chloroplast cells are found in the

• waxy layer

• palisade layer

• spongy layer

• stomata

The reactants needed for photosynthesis to occur are:

• carbon dioxide & water
• carbon dioxide & oxygen
• oxygen & water
• carbon dioxide, oxygen & water

Plants make food through photosynthesis

• True

• False

What is the function of the cell wall in plant cells?

• Energy production
• Cell communication
• Waste removal
• Structural support and protection

What is the function of the chloroplast in plant cells?

• Photosynthesis
• Water absorption
• Cell division
• Cell respiration