Autor: Profª Adriane | Publicado: 2012-09-22T20:16:00-03:00

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
A importância das árvores para a vida



Antipoluição

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Já
no ensino fundamental aprendemos que as árvores absorvem dióxido de carbono,
mas o que muita gente não sabe é que elas também absorvem do ar poluentes
pesados como chumbo, manganês, fuligem e óxido nitroso. Estes tóxicos ficam
armazenados na madeira da árvore e quanto mais velha ela for, mais absorverá.

Árvores são longevas

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Enquanto
os humanos vivem um século, no máximo, algumas árvores são “praticamente
imortais”. Isto acontece com uma espécie chamada sicômoro, se não sucumbir a
acidentes, doenças ou à ação humana.

Autossuficientes

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Elas
cuidam de si próprias e não precisam de muito para sobreviver, apenas de ar,
luminosidade e sais minerais. É que as árvores têm seu próprio mecanismo de
defesa e criam substâncias químicas para afujentar seus inimigos (como ratos e
insetos). Algumas delas também são usadas como medicamentos, como o taxol usado
no combate ao câncer. Outro funcionamento particular das árvores é a
reprodução, realizada por suas próprias sementes.

Extensas

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Uma
árvore de 15 metros de altura pode chegar a até 200 hectares, se for somada
toda a sua superfície ativa. Isto porque a árvore toda respira, ambos os lados
das folhas, o tronco, galhos, raízes e filamentos.

Servem de lar para outras espécies

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; As
raízes das árvores geralmente são mais compridas que seus ramos e abrigam
fungos, líquens, outras plantas, insetos, vermes e até mamíferos.

Tranquilizantes

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Já
experimentou abraçar uma árvore? De acordo com o botânico, o movimento das
folhas das árvores, principalmente certas espécies de coníferas, liberam íons
negativos que têm efeitos benéficos sobre a saúde e o humor das pessoas.

Urbanas

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Embora
as árvores remetam a uma atmosfera bucólica e distante dos grandes centros
urbanos, a presença delas nas cidades torna o ar mais agradável e fresco. Além
da sombra, as árvores também contribuem com a preservação do solo, prevenção de
enchentes e produção de frutos comestíveis. Uma última observação do livro: um
antigo ditado diz que as pessoas precisam plantar ao menos uma árvore em vida,
mas isto pode não ser suficiente. Calcula-se que seria preciso dez árvores para
criar oxigênio suficiente para uma pessoa respirar durante um ano.



http://envolverde.com.br/ambiente/biblioteca-ambiente/a-importancia-das-arvores-para-a-vida/



Acesso em 19/09/2012 às 14:10



1- Responda:

a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Porque
as árvores são importantes para o nosso planeta?

b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Para
que o ser humano utiliza as árvores?

c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Porque
as árvores são consideradas tranquilizantes?

d)&nbsp;&nbsp;&nbsp;&nbsp; Você
conhece alguma árvore usada como medicamento? Qual?



2- &nbsp;Encontre no caça
palavras o nome de 5 árvores:





 

  
  
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3- Escreva um texto como se você fosse uma árvore e
conte-nos como você se formou, para que serve, quais são seus anseios e
angústias.