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.
Q1:
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
Q2:
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.
Q3:
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
Q4:
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
Q5:
Which structural feature of a leaf is important for transporting materials between the leaf and the rest of the plant?
- 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
Q6:
Which leaf feature, evident in the figure, is due to the presence of chlorophyll?
- AHaving a large surface area
- BBeing shiny
- CBeing thin
- DBeing green
- EHaving a network of veins
Q7:
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
Q8:
What structural feature reduces the evaporation of water from the upper leaf surface?
- AThin cross section
- BWaxy layer
- CGreen color
- DLarge surface area
- EStomata
Q9:
Leaves contain chlorophyll. What is its function (job)?
- ATo reduce heat loss
- BTo absorb carbon dioxide
- CTo absorb sunlight
- DTo prevent water loss
Q10:
What is the main function (job) of a leaf?
- ATransport
- BReproduction
- CSupport
- DPhotosynthesis
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