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Admission Tests GRE General Test Sample Questions:

1. Female Australian Dunaiothhps [small, sap-sucking insects] create tent-like structures on the surface of leaves to protect themselves and their eggs and larvae from desiccation in the arid Australian climate. Bono and Crespi compared survival and reproduction of thrips that founded structures alone with those in groups of two or more individuals. They found that although per capita egg production fell with increasing group size, foundresses were more likely to survive and lay eggs in groups than when alone. Several studies of other species of nest-building insects have concluded that foundress associations are beneficial to all parties. It is likely that the relative success of groups is at least in part accounted for by a reduction of energy use in the modification of a shared nest.
The author mentions "desiccation" primarily to

A) exemplify a changing feature of a particular climate
B) analyze an environmental challenge faced by some insect species
C) characterize a stage in an insect species' developmental cycle
D) describe an environment suitable for one species* reproduction
E) identify the purpose served by a particular behavior

2. For a certain type of can. the number of grams of aluminum per can decreased by 20 percent from 1994 to
1998. while the cost per gram of aluminum decreased by 60 percent. If the cost of the aluminum in y cans in
1994 was equal to the cost of aluminum in A v cans in 1998. then k =

A) 6.25
B) 3.125
C) 4.25
D) 5.125
E) 7.875

3. Recent research has questioned the long-standing view of pearly mussels as exclusively suspension feeders (animals that strain suspended particles from water) that subsist on phytoplankton (mostly algae). Early studies of mussel feeding were based on analyses of gut contents, a method that has three weaknesses. First, material in mucus-bound gut contents is difficult to identify and quantify. Second, material found in the gut may pass undigested out of the mussel, not contributing to its nutrition. Finally, examination of gut contents offers limited insight into the mechanisms and behaviors by which mussels acquire food. Modem studies suggest that pearly mussels feed on more than just algae and may use other means than suspension feeding. Pedal feeding (sweeping up edible material with a muscular structure called the foot) has been observed in juvenile pearly mussels.
Besides the phytoplankton pearly mussels capture from the water column, their guts also contain small animals, protozoans, and detritus (nonliving particulate organic material). Recent studies show that mussels can capture and assimilate bacteria as well, a potentially important source of food in many fresh waters.
Another potential source of food for mussels is dissolved organic matter. Early studies showing that pearly mussels could take up simple organic compounds were largely discounted because such labile (unstable) compounds are rarely abundant in nature. Nevertheless, recent work on other bivalves suggests that dissolved organic matter may be a significant source of nutrition.
Of this complex mix of materials that pearly mussels acquire, what is actually required and assimilated?
Stable-isotope analyses of mussels taken from nature and of captive-reared mussels are beginning to offer some insight into this question. Nichols and Garling showed that pearly mussels in a small river were omnivorous, subsisting mainly on particles less than 2S micrometers in diameter, including algae, detritus, and bacteria. Bacterially derived carbon was apparently the primary source of soft-tissue carbon. However, bacteria alone cannot support mussel growth, because they lack the necessary long-chain fatty acids and sterols and are deficient in some amino acids. Bacteria may supplement other food resources, provide growth factors, or be the primary food In habitats such as headwater streams, where phytoplankton is scarce. Juvenile mussels have been most successfully reared m the laboratory on diets containing algae high in polyunsaturated fatty acids. Thus, it appears that the pearly mussel diet in nature may consist of algae, bacteria, detritus, and small animals and that at least some algae and bacteria may be required as a source of essential biochemicals.
The primary purpose of the passage is to

A) suggest that a particular source of nutrients is more essential to pearly mussels than was previously thought
B) question whether research findings about laboratory-reared pearly mussels can be extrapolated to pearly mussels in natural habitats
C) explain why evidence used to support a long-standing view about pearly mussels is flawed
D) contrast two mechanisms by which pearly mussels have been shown lo feed
E) summarize the present state of knowledge about what pearly mussels eat

4. Sunflower sea slurs help maintain certain kelp forest ecosystems by eating quickly reproducing prey species such as urchins, thus keeping populations low. Without the sea stars, the urchin population explodes, which is bad news for kelp forests and everything in them. Giant kelp can grow to 150 feet underwater at a speed of two feet a day. but their weaknesses are their holdfasts. which are akin to tree roots. The holdfasts are home to brittle stars, prawns, and snails, among other creatures. Urchins like to eat the kelp holdfasts. Once the holdfasts are gone, the rest of the kelp drifts oft* in the tides. In this way. urchins can destroy the forests, which, higher up. are also home to fish, including several types of commercially important rockfish.
According to the passage, sea urchin populations

A) reproduce most rapidly in holdfasts of kelp forests
B) often drift in the tide along with sea kelp
C) can damage the habitats where brittle stars live
D) are a favored prey of certain commercially important fish
E) sometimes prey on commercially important fish species

5. In 1995 the United States National Park Service reintroduced wolves into Yellowstone National Park, from which they had been eliminated decades before by overhunting. Biologists hoped the reintroduction would return the park's mix of animals to a more natural state. After the wolves disappearance, the population of their onetime prey, the elk. had burgeoned. Subsequently, new tree growth declined as multiplying elk browsed young trees, denuding certain areas of the park. Following the wolves" return, the elk population declined and young trees rebounded. Most scientists attribute the vegetation changes to the wolves1 return. However.
Ration observes that Yellowstone has not had a harsh winter since wolf numbers reached high levels and suggests that elk may not have needed to resort to trees for food.
It can be inferred from the passage that the scientists would he most likely to cite which of the following in support of their view?

A) The correlation between the reintroduction of wolves into Yellowstone and the decline of the elk population
B) The correlation between wolves' disappearance from Yellowstone and the growth of the elk population
C) The correlation between the rebounding of Yellowstone's trees and the pattern of its winters since 1995

Solutions: