) Pussls up to about 75,000 years old can be dated via carbon-14. About how many
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) Pussls up to about 75,000 years old can be dated via carbon-14. About how many half-lives of carbon-14 would this A) 5 D) 15 se the following paragraph for questions 24-27 ssils of Lystrosaurus, a dicynodont therapsid, are most common in parts of modern-day South America, South Africa, adagascar, India, South Australia, and Antarctica. The animal apparently lived in arid regions, and was mostly rbivorous. It originated during the mid-Permian period, survived the Permian extinction, and dwindled by the late iassic, though there is evidence of a relict population in Australia during the Cretaceous period. Some dicyn o large tusks, extending down from their upper jaws. The tusks were not used for food gathering, and in some species limited to males. Food was gathered using an otherwise toothless beak. Judging from the fossil record in dimentary rocks, these pig-sized organisms were the most common mammal-like reptiles of the Permian .) Which features of Lystrosaurus helps explain why these organisms fossilized so abund I. the presence of hard parts, such as tusk II. its plant-eating diet III. its persistence across at least two geological eras IV. its widespread geographic distribution V. its mixture of reptilian and mammalian features. A) I and II B) III and V C) I, III, and IV D) II, IV, and V 5.) The observation that the tusks of Lystrosaurus were limited to males in several species, and were apparently not used food-gathering, is evidence that the tusks probably A) are homologous to the horns on a rhinoceros B) served to dissipate heat C) were not significant to the survival and/or reproduction of these dicynodonts D) were maintained as a result of sexual selection 6.) There are a dozen known species of the extinct genus Lystrosarus. If each species was suited to a quite different vironment, then the relatively large number of species in this genus could be due to A) adaptive radiation B) sexual selection C) polyploidy D) genetic drift 7.) Lystrosaurus survived the mass extinction that was most closely correlated in time, if not in cause with A) The impact of a 10 km meteor striking the Earth and the enormous accumulation of ash and dust in the atmosphere B) the formation of Pangea and the lava flows that covered large areas of Pangea. C) an intense period of sunspot formation, with a subsequent rise in solar radiation. D) the near total blanketing of the Earth by ice during the "snowball" Earth period.Explanation / Answer
24. i) For a organism to become fossil, it has to be decaying at a very slow rate. So the hard parts such as bones and tusks easily become fossil.
ii) Organism's chance of becoming a fossil is not affected by the organism's diet.
iii) If the organism can survive for a long time, then the number of organism lived will be higher. So the persistance across a long time increases the organisms, becoming fossil.
iv) If the organism lives in widespread geographic conditions, it increases the organism's chance to become fossil by providing a suitable environment for the process of becoming a fossil. If a organism is not distributed across various geographic condition and if the condition at which the organism lives is not suitable for fossils, then the chance of that organism to become fossil is very less.
v) Possessing reptilian and mammalian features do not help in becoming fossils, as reptiles and mammals have almost same probability of becoming fossils.
So, i), iii), iv) are correct.
Answer: option C
25. The key fact given is that the tusks are mostly limited to males and are not used for food gathering.
A) Both male and female rhinoceros. So option A is incorrect.
B) The paragraph doesn't talk about dissipate heat. So option B is also incorrect.
C) The fact that the tusks are mostly limited to males, indicate that they were somehow involved in the reproduction or surrvival. So option C which states that the tusks are not significant for survival and/or reproduction is also incorrect.
D) The fact that the tusks are mostly limited to males, indicate that they were somehow involved in the reproduction or surrvival. Sexual selection is important for reproduction and survival. So option D is correct.
Answer: Option D
26. The phenomenon of organisms diversifying to adapt for a new environment as in the case of lystrosaurus, is called as adaptive radiation.
Sexual selection is the process of selecting a particular member of one sex to reproduce.
Polyploidy is organism having more than two sets of chromosome which is a method of adaptation.
Genetic drift is a method of evolution in which some allele frequencies change over time among the same population because of chance.
Answer: Option A
27. Answer: Option B
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