Irises and other ____ plants flower only when the hours of darkness fall below a critical value, typically in summer
a. short-day
b. long-day
c. annual
d. biennial
e. perennial
ANSWER: b
You might also like to view...
Although freshwater biomes cover less than 1% of the Earth's surface, they are important because ________.
A. they are home to lots of species B. we depend on them for drinking water C. they are the source of our irrigation for agriculture D. All of the above are reasons why freshwater biomes are important.
The decision to initiate an action potential is made at the:
A. synapse. B. axon hillock. C. cell body. D. dendrite.
An operon consists of: a. a promoter and an operator
b. a promoter and a protein. c. a master gene and an operator. d. a promoter and an enzyme. e. an operator and a protein.
In the synthesis of amino acids, the addition of the amino nitrogen usually occurs ________ the synthesis of the carbon skeletons.
A. after B. during C. before