There Is Concern Over the Use of 2,4-D, a Synthetic

question 29

Multiple Choice

There is concern over the use of 2,4-D, a synthetic plant hormone, as a weed killer because the by-product dioxin

• A)can cause irreversible mutations in crop plants.
• B)causes massive fish kills when it gets into lakes and streams.
• C)can cause birth defects and leukemia in mammals.
• D)weakens the shells of the eggs of predatory birds, resulting in the death of their offspring.

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Definitions:

Orgasm

The climax of sexual stimulation characterized by intense pleasure and the release of sexual tensions.

Refractory Period

A phase right after stimulation when a nerve or muscle cannot respond to additional stimulation.

Plateau Phase

A stage in the sexual response cycle where sexual tension and arousal are maintained at a high but stable level, prior to climax.

Excitement Phase

The initial stage of the sexual response cycle, characterized by physical and emotional sensations of arousal.