Question

TRUE/FALSE Please indicate whether each question is true or false and provide a 1 sentence explanation

5. Temperature is associated with terrestrial productivity. If the global temperature increased by 10C we would expect that grasslands would have an increase in both GPP and NPP.

6. In most ecosystems, the rate of phosphorous recycling through fixation exceeds the rate added through weathering.

7. An invasive insect called the Emerald Ash Borer has been killing off ash trees across eastern North America over the past several decades. This is likely to have reduced the GPP of the ecosystem over the course of the outbreak.

8. The current global population is roughly 7.5 billion people. The population would likely not be this high had Fritz Haber (and Carl Bosch) not invented the process for fixing atmospheric nitrogen into ammonia to make nitrogen fertilizer.

Answer 1

5. Temperature is associated with terrestrial productivity. If the global temperature increased by 10C we would expect that grasslands would have an increase in both GPP and NPP

Ans - True

Metabolic rates, including photosynthesis, are generally faster at higher temperatures, so if everything else is perfect, productivity will increase with increasing temperatures

6) In most ecosystems, the rate of phosphorous recycling through fixation exceeds the rate added through weathering

Ans -True (fixation is done by nitrogen fixing bacteria and it is faster than natural weathering

.7). An invasive insect called the Emerald Ash Borer has been killing off ash trees across eastern North America over the past several decades. This is likely to have reduced the GPP of the ecosystem over the course of the outbreak.

Ans - True

As ash trees in forests die, gaps form in the forest canopy, allowing light to reach understory vegetation. Native herbaceous plants may be impacted by the loss of the ash trees and the responses of other vegetation.

8) The current global population is roughly 7.5 billion people. The population would likely not be this high had Fritz Haber (and Carl Bosch) not invented the process for fixing atmospheric nitrogen into ammonia to make nitrogen fertilizer.

Ans-True

Nitrogen fertilizer now supports approximately half of the global population. In other words, Fritz Haber and Carl Bosch — the pioneers of this technological breakthrough — are estimated to have enabled the lives of several billion people, who otherwise would have died prematurely, or never been born at all.