Experiments with Aphids Have Shown That Phloem Sap

question 82

Multiple Choice

Experiments with aphids have shown that phloem sap

• A) does not require living cells.
• B) flows at a rate of about 10 cm per hour.
• C) is passively transported.
• D) is predominantly sucrose.
• E) requires a living aphid to draw it from the tree.

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Definitions:

Home Landscaping

The practice of altering the visible features of an area of land surrounding a home to enhance its appearance or functionality.

Price

The amount of money required to purchase a good or service.

Positive Externality

A benefit that is enjoyed by a third-party as a result of an economic transaction, without them necessarily being involved in the transaction.

Marginal Social Benefit

Sum of the marginal private benefit plus the marginal external benefit.