ENV150 Chapter 12 Questions 110716

ENV150 Chapter 12 Questions 110716 - Adam Davis ENV150 13...

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Adam Davis ENV150 13 November 2016 Chapter 12 – Agriculture and the Ecology of Food 12.1 1. It appears that early agriculture may not have improved human wellbeing compared to hunting and gathering. What was the likely driver for adoption of this style of life? a. Hunting and gathering kept people well nourished whereas farming provided less nutritional value. Also, it took a lot of energy to tend to a farm. 12.2 2. Why are agroecosystems generally more fragile than natural ecosystems? a. The rate at which key nutrients leave the agroecosystem is greater than the rate at which they are replenished. As a result, their growth can stop or the agroecosystem can fail as a whole without fertilizers. 12.3 1. What are the roles of light, water and essential nutrients in crop plant growth? a. Light, water, and nutrients are crucial to photosynthesis. Plants absorb the light to transform CO2 and Water into Carbohydrates. Water also splits into its oxygen and hydrogen components and evaporates. Finally, the nutrients mix with the carbohydrates to finish the last step of photosynthesis.
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