The passage mentions which of the following as a reason for the importance of Lake Vostok to scientists?Pregunta 8Seleccione una:A.It has already been contaminated.B.It can be studied using radio waves.C.It may have elevated levels of ultraviolet light.D.It may contain uncontaminated microbes.

The paragraph following the passage most probably discussesPregunta 10Seleccione una:A.further discoveries on the surface of AntarcticaB.problems with satellite-borne radar equipmentC.ways to study Lake Vostok without contaminating itD.the harsh climate of Antarctica

What is true of Lake Vostok?Pregunta 3Seleccione una:A.It is beneath a thick slab of ice.B.It is heated by the sun.C.It is completely frozen.D.It is not a saltwater lake.

In a village in Karnataka, people started cultivating crops allaround a lake which was always filled with water. They addedfertilisers to their field in order to enhance the yield. Soon theydiscovered that the waterbody was completely covered with greenfloating plants and fish in the lake started dying in large numbers.Analyse the situation and give reasons for excessive growth ofplants and death of fishes in the lake.

Thermal pollution of an aquatic ecosystem may occur if warm water is released into a lake.Suggest and explain the effect this might have on the biotic components of the lake ecosystem.

20)The pH level of lake water, which indicates how acidic or basic the water is, can be influenced by a variety of factors, including acid rain, rock and mineral erosion, and air pollution. Researchers in Alabama hypothesized that recent fluctuations in the pH of the water in Guntersville Lake are attributable to another source: agricultural chemicals that have been entering the lake through runoff. Which finding, if true, would most directly support the researchers' hypothesis?SOCPRAEN-020The pH levels of otherwise similar lakes in Alabama that do not receive as much runoff from farmland as Guntersville Lake does fluctuated less than the pH of Guntersville Lake did in the same period.The pH levels of other lakes in Alabama that are near Guntersville Lake tended to be lower than that of Guntersville Lake regardless of the degree of fluctuation in the pH of Guntersville LakeThe amount of agricultural runoff entering Guntersville Lake steadily decreased during the period in which the lake's pH level fluctuated, while the composition of that runoff remained largely unchanged.Both air pollution and agricultural runoff in the vicinity of Guntersville Lake increased during the period in which the pH of Guntersville Lake fluctuated.21)1. How much of a treatment is mind over matter? It is well-documented that people often feel better after taking a treatment without active ingredients simply because they believe it's real—known as the placebo effect. Now, evidence shows that even if people are aware that their treatment is not "real"—known as non-deceptive placebos—believing that it can heal can lead to changes in how the brain reacts to emotional information. It raises the possibility that people can recover from illnesses even if they are aware that their treatment was a placebo. Which finding, if true, would most directly support the claim made in the text?SOCPRAEN-021Only a small percentage of those who took non-deceptive placebos complained that their condition worsened after taking them.Many participants, who volunteered to take non-deceptive placebos, reported relief from symptoms after taking them.The condition of participants, who were not informed about intake of non-deceptive placebos, improved greatly.All the participants who took non-deceptive placebos felt better a few months after taking them.22)Christina Rossetti wrote "In an Artist's Studio" in 1856. In this reflective sonnet, a speaker visits an artist's studio and finds a vast collection of portraits, all depicting the same gorgeous model. But the speaker knows this model personally—and while these pictures capture this woman's beautiful youth, they ignore the deep sadness of her present-day life. Caught up in his model's idealized loveliness, the artist seems to have missed (or disregarded) the "sorrow" of the living woman in front of him:__________ Which quotation from "In an Artist's Studio" most effectively illustrates the claim?SOCPRAEN-022"A saint, an angel—every canvas means the same one meaning, / neither more or less.""Not as she is, but was when hope shone bright; / Not as she is, but as she fills his dream.""A queen in opal or in ruby dress, / A nameless girl in freshest summer-greens,""He feeds upon her face by day and night, / And she with true kind eyes looks back on him,"