aniket16c wrote:
VeritasKarishma wrote:
aniket16c wrote:
akhil911 wrote:
The Western Jackdaw (Corvus monedula), sometimes known as the Eurasian Jackdaw, European Jackdaw or simply Jackdaw, is a passerine bird in the crow family. Found across Europe, western Asia and North Africa, it is mostly resident, although northern and Eastern populations migrate south in winter. Four subspecies are recognized, which mainly differ in the coloration of the plumage on the head and nape. Carl Linnaeus first classified the bird and described it formally, giving it the name Corvus monedula because of the bird’s supposed fondness for picking up coins (monedula is Latin for money). Later analysis of its DNA suggests that, with its closest relative, the Darian Jackdaw, it is an early offshoot from the genus Corvus, and possibly distinct enough to warrant reclassification in a separate genus, Coloeus. In fact, one authority, the International Ornithological Congress, has recently reassigned the two jackdaw species from the genus Corvus to the genus Coloeus.
Unlike many of its close relatives, the Western Jackdaw has a completely black-plumage with a grey nape and distinctive pale-grey irises. However, like those relatives, it is gregarious and vocal, living in small groups with a complex social structure in farmland, open woodland, on coastal cliffs, and in urban settings. An omnivorous and opportunistic feeder, it eats a wide variety of plant material and invertebrates, as well as food waste from urban areas. Western Jackdaws are monogamous (have only one mate at a time) and build simple nests of sticks in cavities in trees, cliffs, or buildings. About five pale blue or blue-green eggs with brown speckles are laid and incubated by the female. The young fledge (leave the nest) in four to five weeks, sooner than other jackdaws, and the average lifespan of the bird is approximately five years compared.
Q4: Which of the following can properly be inferred about Carl Linnaeus from the passage above?(A) He was the first to discover the Western Jackdaw.
(B) He believed that the Western Jackdaw was fond of coins.
(C) His classification of the Western Jackdaw was wrong.
(D) His prior classifications do not always agree with current DNA data.
(E) He was a member of the International Ornithological Congress.
Dear Experts:
mikemcgarry IanStewart VeritasKarishma daagh EMPOWERgmatVerbal EMPOWERgmatRichC AjiteshArun nightblade354 walker DmitryFarberIn this question, option D means "prior classification". How can we be sure that the classifications point to the "bird classification" or some other classifications?
may be he classified some "fish" before he classified this bird. How do we know if the question is specifically referring to the "bird classification only"?
Doesn't matter how many distinct classifications he did. Prior classification means all prior classifications.
We see an example of one of his prior classification which does not agree with current DNA - Western Jackdaw from Corvus to Coloeus.
So we can infer that his prior classifications do not ALWAYS agree with current DNA data. They do not always agree, they may in some cases, may not in others. We have an example in which it doesn't so we can say that they don't agree always. Sometimes they may, sometimes they may not.
Dear
VeritasKarishmaThank you for the explanation!
I agree that if one classification is incorrect, we can say that all classifications do not ALWAYS agree with correct DNA data. However, it seems I did not correctly articulate my doubt.
My doubt is more about use of the word "prior".
Prior means " a previous". Hence, doesn't this question focus on the classifications he did before the "Jackdaw bird" classification?
We do not have any information about "prior classification".
Note what the passage says:
Carl Linnaeus
first classified the bird and described it formally, giving it the name Corvus monedula because of the bird’s supposed fondness for picking up coins (monedula is Latin for money). Later analysis of its DNA suggests that, with its closest relative, the Darian Jackdaw, it is an early offshoot from the genus Corvus, and possibly distinct enough to warrant reclassification in a separate genus, Coloeus.
When Carl Linnaeus first classified it, he put it in genus Corvus.
Later analysis of its DNA suggests that it belongs to genus Coloeus.
So his prior classification does not agree with current DNA data.
close
29 May 2020, 04:55
