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Pine Species Adaptations Investigation

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Pine Species Adaptations Investigation

Alex and Keira are helping prepare a science museum exhibit about how pine trees survive. Use the exhibit evidence and experiment results below to explain how pine features can help a tree survive. Answer in complete sentences where appropriate.

Explore the evidence

Pine needles are narrow leaves. Many have a waxy outer surface, and pine cones contain seeds between their scales. Use these facts and the experimental results in this investigation.

1.Use the evidence above to identify two features of pine needles or cones. For each feature, state one possible advantage to the tree.

2.The museum team wants to test whether a waxy coating reduces water loss. Which is the best controlled comparison?

Weigh two similar needle samples, leave one coated and one uncoated in the same conditions, then compare their mass changes.
Compare a large pine tree with a small broad-leaved plant after a week.
Put coated needles in a warm room and uncoated needles in a cold room.
Count how many cones are on two trees of different ages.

Test a possible adaptation

Hugo tests whether a wax-like coating slows water loss from cut pine needles. He weighs equal-sized needle samples at the start and again after 24 hours. Both samples are kept at the same temperature and light level.

Sample

Starting mass (g)

Mass after 24 hours (g)

Wax-like coating

10.0

9.4

No coating

10.0

8.8

3.Calculate the mass lost by each sample. Show the subtraction or state both results with units.

4.Which sample lost more mass, and what does this result suggest about the coating?

5.True or false: these results prove that waxy coatings are the only reason pine trees can survive dry conditions. Explain your choice.

6.Name one variable Hugo should keep the same in both groups, besides the starting mass, and explain why.

Adaptations and survival

Adaptations are inherited features that can improve an organism’s chances of surviving and reproducing in a particular environment. An adaptation may be structural, behavioural, or physiological.

7.Match each pine feature to the most likely benefit.

Narrow, waxy needles
Woody cone scales
Light seeds with wings in some pine species

Protect developing seeds
Can be carried away from the parent tree by wind
Can reduce water loss

8.Pine cones may open as they dry. Explain how opening can help a pine reproduce, and describe one condition that could make seed dispersal less successful.

9.A pine growing in a dry, windy site faces different challenges from one in a cool, wet site. Choose one feature—needles, bark, roots, or cones—and explain how it could help in one of these environments.

10.Write a short museum caption explaining how evidence from Hugo’s test supports an idea about pine adaptation. Include one result from the table and one limitation of the test.