A small island has stable populations of plants and animals, including one species of hawk but no other large predators. A ship docks at the island, and the ship's cat escapes. If the cat was pregnant, what do you think the sailors are likely to find if they return ten years later?
A. The island will have similar flora and fauna, with the addition of a cat population.
B. The increase in nitrogenous waste from the cats will increase plant productivity.
C. The bird and lizard species on the island will have many new adaptations.
D. Some species of ground-nesting birds may have gone extinct.
E. Species that were formerly preyed upon by hawks will benefit.
D. Some species of ground-nesting birds may have gone extinct.
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Four of the five answers listed below are parts
of a leaf. Select the EXCEPTION.
a. stoma b. cuticle c. mesophyll d. pith e. petiole
Which tree species was most often killed by A. ostoyae in control forests? Which was least affected by the fungus? For the most affected species, what percentage of deaths did A. ostoyae cause in control and in experimental forests? Looking at the overall results, do the data support the hypothesis? Does stump removal reduce effects of A. ostoyae? These data best support the hypothesis that:
1.Armillaria ostoyae acts as a parasite of living trees because it draws nutrients from them.
2.Pine trees had the highest overall mortality rate
3.Birch trees were rare in this forest.
4.Stump removal reduced the effects of A. ostoyae.
The difference between taproot and fibrous root systems is that a taproot system:a
consists of many roots of the same size, while a fibrous root system has one main root with lateral roots. b. consists of one main root with lateral roots, while a fibrous root system has many roots of the same size. c. is characteristic of most monocots, while a fibrous root system is usually found in eudicots. d. can be modified for storage, while a fibrous root system cannot. e. is considered adventitious, while a fibrous root system is not.
Which of the following is true about the North American diet?
a. Most of our protein comes from plant sources. b. Approximately half of our carbohydrates come from simple sugars. c. Most of our fats come from plant sources. d. Most of our carbohydrates come from fibers.