Agronomia: A compreensão da mobilidade dos...

Questão

A compreensão da mobilidade dos nutrientes no floema é essencial para o diagnóstico visual de deficiências nutricionais em campo. Ao observar um arbusto que apresenta clorose (amarelecimento) uniforme nas folhas velhas (baixeiras), enquanto as folhas novas permanecem verdes, o jardineiro deve associar esse sintoma à deficiência de um macronutriente móvel. Assinale a alternativa que indica o nutriente e a justificativa fisiológica correta:

Alternativas

A) Nitrogênio (N): por ser altamente móvel na planta, ele é translocado dos tecidos maduros para as brotações novas em caso de escassez, causando a clorose basal.

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B) Ferro (Fe): sendo um micronutriente imóvel, a planta não consegue redistribuí-lo, resultando em amarelamento apenas nas nervuras das folhas velhas.

C) Fósforo (P): a deficiência causa clorose intensa nas pontas das folhas novas devido à rápida oxidação da clorofila exposta à luz solar direta.

D) Cálcio (Ca): sua falta provoca a necrose das bordas das folhas velhas, pois é um elemento estrutural da parede celular que se move livremente pelo xilema.

E) Potássio (K): o sintoma típico é o amarelamento total das folhas novas, pois o potássio se concentra nas raízes para regular a pressão osmótica.

Explicação

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agronomia deficiencias-nutricionais fisiologia-vegetal nutricao-de-plantas

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Em nosso material de estudos vimos a importância da cadeia produtiva das frutas bem como suas nuances quanto ao planejamento. Neste contexto, o que vem a ser PIF:

They used to spend summer vacations in Vermont, where her grandmother had a ________. She used to ______ the cows, and also played with all her ________. There were a lot of crows there, and when she was at school, she used to ______ whenever she heard a crow.

They used to spend summer vacations in Vermont, where her grandmother had a ________. She used to ________ the cows, and also played with all her ________. There were a lot of crows there, and when she was at school, she used to ________ whenever she heard a crow.

Listen again. Write one word in each blank. You can read the audio script for help. The one thing he didn't like about the vacations was the _____ trip _____ because he was always _____ car sick. are able to remember what these vacations were like because his father _____ them.

Como o estudante Ishaan via as letras no quadro e no caderno? Por que isso acontecia?

Comece a estudar de forma inteligente hoje mesmo

They used to spend summer vacations in Vermont, where her grandmother had a . She used to the cows, and also played with all her . There were a lot of crows there, and when she was at school, she used to whenever she heard a crow.

They used to spend summer vacations in Vermont, where her grandmother had a . She used to the cows, and also played with all her . There were a lot of crows there, and when she was at school, she used to whenever she heard a crow.

Listen again. Write one word in each blank. You can read the audio script for help. The one thing he didn't like about the vacations was the ___ trip _ because he was always _ car sick. are able to remember what these vacations were like because his father ___ them.