How might a plant communicate to another plant that it has been attacked by a herbivore?
What will be an ideal response?
ANSWER: In some plants, such as creosote bush, the secondary compound that protects the plant from
herbivore damage is a volatile compound. For example, terpenes are volatile and easily
diffuse out the plant into the surrounding air. Such release of a volatile might elicit
responses in neighboring plants or attract insects to the plant that prey on the herbivore.
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True or false: Bushmen hunters exploit the effects of physiological stress by forcing their prey to run when the temperature exceeds the animal's core temperature
A. true B. false
Scientists disagree about how many species are currently on earth for all of the following reasons EXCEPT:
a) there is controversy over whether natural selection is the only mode of speciation. b) there is not one true definition of species. c) at any one time, there are few populations in the process of speciation. d) there are many organisms on Earth that have yet to be discovered. e) different scientists use different techniques to estimate the actual number of species from the known number of species.
Which type of lipid is composed of long-chain fatty acids attached to long-chain alcohols?
A. Triglycerides B. Phospholipids C. Sterols D. Waxes E. Most neutral fats
When bar-headed geese fly at very high altitudes (possibly over Mount Everest!), they breathe very thin air where the partial pressure of oxygen is very low compared to that at sea level. Which of the following adaptions would help the geese efficiently
exchange gases when flying at high altitudes? A) hemoglobin that has a high affinity for oxygen B) hemoglobin that has a low affinity for oxygen C) hemoglobin that has a high affinity for carbon dioxide D) hemoglobin that has a low affinity for carbon dioxide