Which of the following is a physiological change that is most likely to increase survival of a plant on a mountaintop near the timberline?
a.
development of polymorphic leaves
b.
reproduction through the growth of fleshy berries
c.
decreased growth
d.
development of shallow roots

The answer is C. Decreased Growth.

Explanation:

Near the timberline of a mountain, plants will have less available carbon dioxide and oxygen, cold temperatures, and higher wind exposure. Smaller plants need less carbon dioxide and oxygen, are less affected by the wind, and need fewer nutrients.

(Explanation is from Study Island)

the answer is b: 1.4 km/hr

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