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Várias técnicas de química analítica e de análise instrumental desempenham um papel essencial na análise de compostos bioativos e de vitaminas presentes em matrizes alimentares complexas. Em relação a esses compostos e aos métodos para sua identificação em alimentos, julgue os itens a seguir.
Os compostos fenólicos, encontrados em alimentos como frutas, vegetais, chás, vinhos e chocolates, são metabólitos secundários de plantas, caracterizados pela presença de pelo menos um anel aromático ligado a grupos hidroxila, sendo responsáveis por diversas características sensoriais, como amargor, adstringência, cor, aroma e estabilidade oxidativa dos alimentos.
Provas
Na tabela a seguir, são registradas as estatísticas descritivas relacionadas a uma amostra aleatória de 100 indivíduos em estudo sobre a altura média de plantas de determinada cultura em um terreno com um total de 10.000 plantas.
| estatística amostral | (em cm) |
|---|---|
| média | 150 |
| mediana | 152 |
| moda | 154 |
| amplitude total | 40 |
| desvio padrão | 15 |
Com base nas informações apresentadas, julgue os próximos itens.
A amplitude interquartil é inferior a 43.
Provas
Considerando que as perdas pós-colheita de frutas e hortaliças representam um desafio significativo na cadeia produtiva, impactando a disponibilidade de alimentos e a rentabilidade dos produtores, julgue os itens a seguir, acerca de aspectos fisiológicos e tecnologias pós-colheita.
A sanitização de frutas e hortaliças minimamente processadas deve ser realizada apenas com água potável, pois o uso de agentes químicos, como soluções cloradas, pode deixar resíduos prejudiciais à saúde e comprometer a qualidade sensorial dos produtos.
Provas
Considerando que as perdas pós-colheita de frutas e hortaliças representam um desafio significativo na cadeia produtiva, impactando a disponibilidade de alimentos e a rentabilidade dos produtores, julgue os itens a seguir, acerca de aspectos fisiológicos e tecnologias pós-colheita.
As injúrias mecânicas, como cortes e abrasões, aumentam significativamente a taxa respiratória e a produção de etileno nos tecidos vegetais, acelerando processos de deterioração; para mitigar esses efeitos em produtos minimamente processados, recomendam-se a utilização de lâminas afiadas durante o corte e a manutenção de baixas temperaturas de armazenamento.
Provas
Considerando que as perdas pós-colheita de frutas e hortaliças representam um desafio significativo na cadeia produtiva, impactando a disponibilidade de alimentos e a rentabilidade dos produtores, julgue os itens a seguir, acerca de aspectos fisiológicos e tecnologias pós-colheita.
Dispensa-se a refrigeração imediata dos frutos e hortaliças colhidos caso sejam utilizados reguladores de crescimento na fase de produção, pois esses compostos garantem estabilidade metabólica suficiente para a preservação da qualidade pós-colheita desses produtos por períodos prolongados.
Provas
Considerando que as perdas pós-colheita de frutas e hortaliças representam um desafio significativo na cadeia produtiva, impactando a disponibilidade de alimentos e a rentabilidade dos produtores, julgue os itens a seguir, acerca de aspectos fisiológicos e tecnologias pós-colheita.
A atmosfera modificada, caracterizada pela redução de O₂ e aumento de CO₂, é uma estratégia eficaz para minimizar a atividade metabólica das hortaliças e controlar o crescimento microbiano, estando sua eficácia condicionada ao uso de temperaturas de refrigeração durante o seu armazenamento e transporte.
Provas
Considerando que as perdas pós-colheita de frutas e hortaliças representam um desafio significativo na cadeia produtiva, impactando a disponibilidade de alimentos e a rentabilidade dos produtores, julgue os itens a seguir, acerca de aspectos fisiológicos e tecnologias pós-colheita.
A temperatura de refrigeração é um fator crítico no controle do crescimento microbiano em produtos minimamente processados, mas microrganismos psicrotróficos, como Listeria monocytogenes, podem crescer nessas condições; caso ocorra abuso de temperatura, microrganismos mesofílicos, como Salmonella sp. e Escherichia coli O157:H7, podem se proliferar, o que representa risco à saúde.
Provas
Climate change poses significant challenges to cattle farming, a sector vital to global food security. Among the most pressing concerns is the increasing frequency and intensity of droughts. Reduced rainfall diminishes pasture quality and availability, limiting feed for livestock and increasing water scarcity. This can lead to decreased animal growth rates, reduced milk production, and increased mortality rates. Moreover, prolonged droughts can contribute to desertification, shrinking available grazing land and forcing farmers to adopt costly alternative feeding strategies.
Beyond drought, other climate-related impacts include heat stress, which can significantly impact animal health and productivity. Rising temperatures can exacerbate heat stress, leading to decreased feed intake, reduced fertility, and increased mortality in livestock. Furthermore, extreme weather events, such as heavy rainfall and flooding, can cause infrastructure damage, contaminate water sources, and lead to the loss of livestock.
The cattle farming sector itself contributes to climate change through greenhouse gas emissions, primarily methane produced during animal digestion and nitrous oxide from manure management. Deforestation for pasture expansion also releases significant amounts of carbon dioxide.
To address these challenges, a multi-pronged approach is crucial.
• Genetic selection: Breeding programs focused on developing drought-resistant and heat-tolerant livestock breeds are vital.
• Sustainable feeding strategies: Implementing precision feeding techniques, improving feed efficiency, and exploring alternative feed sources, such as drought-resistant forage varieties, can enhance livestock resilience.
• Integrated farming systems: Integrating crop and livestock production, such as through agroforestry systems, can improve soil health, enhance water retention, and reduce greenhouse gas emissions.
• Technological innovations: Utilizing technologies such as precision livestock farming, remote sensing for pasture monitoring, and renewable energy sources can improve resource efficiency and reduce the environmental footprint of cattle production.
Furthermore, strong policy support, including incentives for sustainable farming practices, investments in research and development, and improved access to climate information services, are essential for the long-term sustainability of the cattle farming sector.
Addressing the challenges posed by climate change requires a collaborative effort involving farmers, researchers, policymakers, and consumers. By embracing innovative solutions, prioritizing sustainable practices, and fostering a collective understanding of the importance of climate-resilient livestock production, we can ensure a future when this vital sector continues to thrive while minimizing its environmental impact.
Internet:<conafer.org.br> (adapted).
Judge the following items based on the text above.
The word “Furthermore” (in the second paragraph) can be correctly replaced with the term Besides that without changing the meaning of the tex.
Provas
Climate change poses significant challenges to cattle farming, a sector vital to global food security. Among the most pressing concerns is the increasing frequency and intensity of droughts. Reduced rainfall diminishes pasture quality and availability, limiting feed for livestock and increasing water scarcity. This can lead to decreased animal growth rates, reduced milk production, and increased mortality rates. Moreover, prolonged droughts can contribute to desertification, shrinking available grazing land and forcing farmers to adopt costly alternative feeding strategies.
Beyond drought, other climate-related impacts include heat stress, which can significantly impact animal health and productivity. Rising temperatures can exacerbate heat stress, leading to decreased feed intake, reduced fertility, and increased mortality in livestock. Furthermore, extreme weather events, such as heavy rainfall and flooding, can cause infrastructure damage, contaminate water sources, and lead to the loss of livestock.
The cattle farming sector itself contributes to climate change through greenhouse gas emissions, primarily methane produced during animal digestion and nitrous oxide from manure management. Deforestation for pasture expansion also releases significant amounts of carbon dioxide.
To address these challenges, a multi-pronged approach is crucial.
• Genetic selection: Breeding programs focused on developing drought-resistant and heat-tolerant livestock breeds are vital.
• Sustainable feeding strategies: Implementing precision feeding techniques, improving feed efficiency, and exploring alternative feed sources, such as drought-resistant forage varieties, can enhance livestock resilience.
• Integrated farming systems: Integrating crop and livestock production, such as through agroforestry systems, can improve soil health, enhance water retention, and reduce greenhouse gas emissions.
• Technological innovations: Utilizing technologies such as precision livestock farming, remote sensing for pasture monitoring, and renewable energy sources can improve resource efficiency and reduce the environmental footprint of cattle production.
Furthermore, strong policy support, including incentives for sustainable farming practices, investments in research and development, and improved access to climate information services, are essential for the long-term sustainability of the cattle farming sector.
Addressing the challenges posed by climate change requires a collaborative effort involving farmers, researchers, policymakers, and consumers. By embracing innovative solutions, prioritizing sustainable practices, and fostering a collective understanding of the importance of climate-resilient livestock production, we can ensure a future when this vital sector continues to thrive while minimizing its environmental impact.
Internet:<conafer.org.br> (adapted).
Judge the following items based on the text above.
Crop-livestock-forest integration systems do not influence water conservation.
Provas
Climate change poses significant challenges to cattle farming, a sector vital to global food security. Among the most pressing concerns is the increasing frequency and intensity of droughts. Reduced rainfall diminishes pasture quality and availability, limiting feed for livestock and increasing water scarcity. This can lead to decreased animal growth rates, reduced milk production, and increased mortality rates. Moreover, prolonged droughts can contribute to desertification, shrinking available grazing land and forcing farmers to adopt costly alternative feeding strategies.
Beyond drought, other climate-related impacts include heat stress, which can significantly impact animal health and productivity. Rising temperatures can exacerbate heat stress, leading to decreased feed intake, reduced fertility, and increased mortality in livestock. Furthermore, extreme weather events, such as heavy rainfall and flooding, can cause infrastructure damage, contaminate water sources, and lead to the loss of livestock.
The cattle farming sector itself contributes to climate change through greenhouse gas emissions, primarily methane produced during animal digestion and nitrous oxide from manure management. Deforestation for pasture expansion also releases significant amounts of carbon dioxide.
To address these challenges, a multi-pronged approach is crucial.
• Genetic selection: Breeding programs focused on developing drought-resistant and heat-tolerant livestock breeds are vital.
• Sustainable feeding strategies: Implementing precision feeding techniques, improving feed efficiency, and exploring alternative feed sources, such as drought-resistant forage varieties, can enhance livestock resilience.
• Integrated farming systems: Integrating crop and livestock production, such as through agroforestry systems, can improve soil health, enhance water retention, and reduce greenhouse gas emissions.
• Technological innovations: Utilizing technologies such as precision livestock farming, remote sensing for pasture monitoring, and renewable energy sources can improve resource efficiency and reduce the environmental footprint of cattle production.
Furthermore, strong policy support, including incentives for sustainable farming practices, investments in research and development, and improved access to climate information services, are essential for the long-term sustainability of the cattle farming sector.
Addressing the challenges posed by climate change requires a collaborative effort involving farmers, researchers, policymakers, and consumers. By embracing innovative solutions, prioritizing sustainable practices, and fostering a collective understanding of the importance of climate-resilient livestock production, we can ensure a future when this vital sector continues to thrive while minimizing its environmental impact.
Internet:<conafer.org.br> (adapted).
Judge the following items based on the text above.
One of the strategies proposed focuses on specific systems for both soil health and water retention improvement.
Provas
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