17 Constitutive defenses are only present under conditions of high predation (or

Question

17 Constitutive defenses are only present under conditions of high predation (or herbivory). Multiple Choice: (1.5 pts each) 18. In plants, vascular tissue serves what specific function? protection from the external environment the site of photosynthesis and respiration transport of materials inside the plant nutrient storage none of the above a. b. c. d. e. 19. An ecologist who focuses mostly on density-independent factors will likely be measuring variables such as: a. competition for prey, moisture and predator behavior b. refuge availability, food supply and seasonality temperature, water chemistry and precipitation c. d. e. temperature tolerance, juvenile survivorship and disease risk sea wave energy, rocky reef space availability and species diversity 20. What is true about a "Type I" survivorship curve? Individuals are equally likely to die at any age. a. b. Mortality rates are highest later in life. c. Only a small proportion of individuals survive to reproductive age d. Individuals tend to produce a small number of offspring. e. More than one of these is correct. 21. What characteristic(s) of Monarch butterflies suggests that they most likely coevolved with milkweed? a. Bright coloration b. Tolerance to toxins c. Delayed metamorphosis d. Feeding behaviors that increase the production of latex in milkweed e. All of the above 22. Global climate change is currently contributing to all of the following EXCEPT a. an increase in food supply from warmer conditions c. melting polar ice b. coastal flooding and inland droughts e. sea level rise d. erratic weather

Explanation / Answer

18) C. Transport of material inside the [lant.

Xylem transports water and minerals from root to the plant and phloem transports dissolved nutrients in all directions within the plant.

20) D. Individuals most likely to produce small number of offsprings.

22) A. An increase in food supply from warmer conditions.

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