Which of the following statements about flowering plants is TRUE?  

A.  A short-day plant requires nights longer than a certain critical period to trigger flowering.
B.  A long-day plant requires nights shorter than a certain critical period to inhibit flowering.
C.  A short-day plant requires daylight of short wavelengths.
D.  A long-day plant requires long wavelengths during the night.
E.  A long-day plant requires long days alternating with short days.


A.  A short-day plant requires nights longer than a certain critical period to trigger flowering.

Biology & Microbiology

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Which component of a negative feedback mechanism does the brain or spinal cord represent?

a. response b. sensor c. integrator d. effector e. stimulus

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The ability of the surface waters of the ocean to take up carbon dioxide is governed by the reaction of carbon dioxide with the ________ ion to form bicarbonates

Fill in the blank(s) with correct word

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The source of benzene as a chemical pollutant is ________

A) wood preservative B) petroleum products C) pulp and paper bleaching D) rubber compounds E) plastic manufacturing

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Homeostatic mechanisms are processes that:a

connect distant parts of the body by transporting materials. b. store and release fuel needed for cellular respiration. c. maintain a relatively constant internal environment. d. form lamellae within the osteons. e. relay, process, and store information.

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