Lesson Worksheet: Leaf Structure and Function Science

In this worksheet, we will practice identifying the different cells that make up a leaf and describing how the leaf structure is adapted to carry out photosynthesis.


Why do leaves often have a thicker layer of wax on the upper surface compared to that on the lower surface?

  • ABecause insects such as caterpillars cause more damage to the upper leaf surface
  • BBecause the leaf loses more heat from its upper surface and wax acts as an insulator
  • CBecause the heat from the Sun causes more evaporation and water loss on the top surface
  • DThe wax’s waterproof properties prevent damage from heavy rainstorms
  • EBecause there are more chloroplasts near the upper surface and the wax focuses the light


Stomata usually close at night but sometimes they also close during the day when the weather is very hot. Why would this help the plant to survive?

  • AIt allows the plant to store more glucose inside cells.
  • BIt increases the absorption of water and minerals in the roots.
  • CIt stops the plant from losing too much water and wilting.
  • DIt increases the supply of carbon dioxide for photosynthesis.
  • EIt allows oxygen to build up inside the leaf for respiration.


How do gases enter and leave a leaf?

  • ABy diffusion through the waxy layer
  • BBy diffusion through the stomata
  • CIn solutions through the leaf veins
  • DBy diffusion through the leaf veins
  • EBy osmosis through the stomata


Where in a leaf do you find the cells with the most chloroplasts?

  • AIn the leaf veins
  • BIn the spongy layer
  • CIn the palisade layer
  • DIn the waxy layer
  • EAround the stomata


Which structural feature of a leaf is important for transporting materials between the leaf and the rest of the plant?

Beautiful green leaf on a white background
  • ABeing very thin
  • BHaving a large surface area
  • CHaving a thick layer of wax on the upper surface
  • DHaving a network of veins
  • EBeing green


Which leaf feature, evident in the figure, is due to the presence of chlorophyll?

Green leaf isolated-edited
  • AHaving a large surface area
  • BBeing shiny
  • CBeing thin
  • DBeing green
  • EHaving a network of veins


Which structural feature of a leaf, shown in the figure, makes it well adapted for absorbing sunlight?

  • AHaving a large surface area
  • BBeing thin
  • CHaving a network of veins
  • DHaving a thick layer of wax on the upper surface


What structural feature reduces the evaporation of water from the upper leaf surface?

  • AThin cross section
  • BWaxy layer
  • CGreen color
  • DLarge surface area
  • EStomata


Leaves contain chlorophyll. What is its function (job)?

  • ATo reduce heat loss
  • BTo absorb carbon dioxide
  • CTo absorb sunlight
  • DTo prevent water loss


What is the main function (job) of a leaf?

  • ATransport
  • BReproduction
  • CSupport
  • DPhotosynthesis

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