The Ability of Plants to Measure Night Length Was Determined

question 206

Multiple Choice

The ability of plants to measure night length was determined by experiments in which

• A) plants were grown in 12 hours of darkness alternating with 12 hours of light.
• B) plants were grown in continuous light.
• C) plants were grown in dark periods that were interrupted with brief pulses of light.
• D) flowering was measured in plants of different ages that had been placed on the same light-dark schedule.
• E) plants were grown in a 24-hour cycle in which the length of the light period was increased gradually.

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Definitions:

Side-effects

Secondary, often undesirable effects of a drug or medical treatment beyond the intended therapeutic effects.

Double Blind

An experimental design in which neither the participants nor the researchers conducting the test are aware of who is receiving a particular treatment, to prevent bias.

Random Assignment

A process used in experiments to assign participants to different groups using a random mechanism, ensuring each participant has an equal chance of being placed in any group.

Good Serves

Good serves refer to successful and effective service actions in games like tennis or volleyball that significantly increase the chance of scoring.