Trees in the Desert and Trees in the Rainforest Experience

question 13

Multiple Choice

Trees in the desert and trees in the rainforest experience vast differences in the amount of water available for uptake. Water can be lost from the leaf surface very easily in dry and hot regions. What types of differences might you expect between different tree species in a rainforest compared with a desert?

• A)Rainforest trees have adaptations for conserving water.
• B)Rainforest trees have adaptations for requiring less water than trees in the desert.
• C)Rainforest trees do not have any adaptations related to water conservation or loss.
• D)Rainforest trees have different adaptations for water conservation and loss than trees in the desert.

---

Definitions:

Expected Value

The long-run average value of repetitions of the experiment it represents, computed as the weighted average of all possible values.

Poisson Random Variable

Represents the number of events occurring in a fixed interval of time or space, assuming that these events happen with a known constant mean rate and independently of the time since the last event.

Random Variable

A variable whose possible values are numerical outcomes of a random phenomenon, used in probability and statistics to model randomness.

Expected Value

The anticipated value of a variable, calculated as the sum of all possible values each multiplied by the probability of its occurrence.