Foram encontradas 50 questões.
Entende-se como eutroficação o processo que ocorre naturalmente nos ecossistemas aquáticos, tornando-os mais ricos em nutrientes dissolvidos necessários para o aumento da produção primária e da biomassa.
Em relação à eutroficação, analise as afirmações:
I. o excesso de nitrogênio, fósforo e de outros nutrientes favorece o desenvolvimento de algas;
II. a escassez do fósforo favorece o desenvolvimento desordenado de algas;
III. na maior parte dos países em desenvolvimento, os grandes centros urbanos não possuem sistema de tratamento de esgoto doméstico e industrial adequado, propiciando a eutroficação.
Está correto o que se afirma em
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Ciclo biogeoquímico pode ser considerado como o percurso realizado por determinado(s) elemento(s) químico(s) através da atmosfera, hidrosfera, litosfera e biosfera da Terra.
Um dos processos que tem relação com o ciclo do nitrogênio é a(o)
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Os mares são divididos por zonas ou regiões, que podem ser classificadas de acordo com a profundidade, declividade e distância do afastamento da costa. Para a profundidade, conhecem-se as zonas: litorânea, nerítica, batial e abissal.
Com relação a isso, assinale a alternativa correta.
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Sabe-se que organismos marinhos são classificados de acordo com sua capacidade de deslocamento na coluna de água ou sua relação com o substrato.
Com relação a esses seres vivos, analise as afirmações a seguir:
I. os mamíferos marinhos fazem parte do plâncton;
II. os organismos que fazem parte do nécton se deslocam com facilidade na coluna d’água, contra ou a favor de correntes;
III. Bentos é um conjunto de seres que dependem do substrato para fixação ou para alimentação;
IV. os organismos fitoplanctônicos são autótrofos e flutuantes, sendo transportados pelas correntes marinhas;
V. organismos bentônicos vivem livremente na coluna d’água.
Está correto apenas o que se afirma em
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Perfis verticais de temperatura, salinidade e densidade da água do mar podem apresentar estruturas de alterações bruscas nas variáveis em pequenas faixas de profundidade.
Essas estruturas são denominadas, respectivamente:
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De acordo com a norma-padrão da língua portuguesa, assinale a alternativa em que a concordância verbal e/ou nominal está corretamente empregada.
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Leia o texto para responder a questão.
DIET DRINKS "LINK TO DEPRESSION" QUESTIONED
Experts are questioning whether diet drinks could raise depression risk, after a large study has found a link.
The US research in more than 250,000 people found depression was more common among frequent consumers of artificially sweetened beverages. The work, which will be presented at the American Academy of Neurology’s annual meeting, did not look at the cause for this link.
Drinking coffee was linked with a lower risk of depression.
People who drank four cups a day were 10% less likely to be diagnosed with depression during the 10-year study period than those who drank no coffee. But those who drank four cans or glasses of diet fizzy drinks or artificially sweetened juice a day increased their risk of depression by about a third. Lead researcher Dr Honglei Chen, of the National Institutes of Health in North Carolina, said: “Our research suggests that cutting out or down on sweetened diet drinks or replacing them with unsweetened coffee may naturally help lower your depression risk.”
But he said more studies were needed to explore this. There are many other factors that may be involved. And the findings – in people in their 50s, 60s, 70s and 80s and living in the US – might not apply to other populations. The safety of sweeteners, like aspartame, has been extensively tested by scientists and is assured by regulators.
Gaynor Bussell, of the British Dietetic Association, said: “Sweeteners used to be called ‘artificial’ sweeteners and unfortunately the term ‘artificial’ has evoked suspicion. As a result, sweeteners have been very widely tested and reviewed for safety and the ones on the market have an excellent safety track record. However, the studies on them continue and this one has thrown up a possibly link – not a cause and effect – with depression.”
(http://www.bbc.co.uk/news/health-20943509.09.01.2013. Adaptado)
Provas
Leia o texto para responder a questão.
DIET DRINKS "LINK TO DEPRESSION" QUESTIONED
Experts are questioning whether diet drinks could raise depression risk, after a large study has found a link.
The US research in more than 250,000 people found depression was more common among frequent consumers of artificially sweetened beverages. The work, which will be presented at the American Academy of Neurology’s annual meeting, did not look at the cause for this link.
Drinking coffee was linked with a lower risk of depression.
People who drank four cups a day were 10% less likely to be diagnosed with depression during the 10-year study period than those who drank no coffee. But those who drank four cans or glasses of diet fizzy drinks or artificially sweetened juice a day increased their risk of depression by about a third. Lead researcher Dr Honglei Chen, of the National Institutes of Health in North Carolina, said: “Our research suggests that cutting out or down on sweetened diet drinks or replacing them with unsweetened coffee may naturally help lower your depression risk.”
But he said more studies were needed to explore this. There are many other factors that may be involved. And the findings – in people in their 50s, 60s, 70s and 80s and living in the US – might not apply to other populations. The safety of sweeteners, like aspartame, has been extensively tested by scientists and is assured by regulators.
Gaynor Bussell, of the British Dietetic Association, said: “Sweeteners used to be called ‘artificial’ sweeteners and unfortunately the term ‘artificial’ has evoked suspicion. As a result, sweeteners have been very widely tested and reviewed for safety and the ones on the market have an excellent safety track record. However, the studies on them continue and this one has thrown up a possibly link – not a cause and effect – with depression.”
(http://www.bbc.co.uk/news/health-20943509.09.01.2013. Adaptado)
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