Differentiate between circadian rhythms and photoperiodism. Give examples of each. What regulates
these responses? What will be an ideal response?
Concepts to Consider: Photoperiodism is any response to changing lengths of day and night;
responses are tied to phytochrome, resulting in influences on timing of flowering, seed germination,
leaf abscission and shade avoidance; circadian rhythms are those based on a 24-hour cycle and may be
cued to phytochromes as well as cryptochormes, influencing sleep movements, stomatal opening and
closing, and opening and closing of flowers.
You might also like to view...
Which of the following is a disadvantage of dry heat methods such as using a Bunsen burner to incinerate microbes from an inoculating loop and the use of a hot air oven?
A. Bunsen burners and hot air ovens only reach a maximum of 100°C so they are not effective against endospores. B. Bunsen burners take too long to sterilize and hot air ovens are hazardous for the operators. C. Neither of these methods actually sterilize; they only kill vegetative cells. D. Use of an open flame can be dangerous and hot air ovens take much longer to sterilize than autoclaves.
Which of the following will increase the unloading of oxygen within the tissue?
A) increased hydrogen ion concentration only B) increased PCO2 only C) increased body temperature only D) both increased hydrogen ion concentration and increased body temperature E) increased hydrogen ion concentration, increased body temperature, and increased PCO2
Refer to Figure 56-2. Which of the following represents the fall turnover?
a. 1 going to 2 b. 2 going to 3 c. 3 going to 4 d. 4 going to 1 e. 4 going to 2 What will be an ideal response?
A primary purpose for the use of stains in microscopy is to increase the (magnification/brightness/contrast) of a specimen.
Fill in the blank(s) with the appropriate word(s).