Chapter 7 Multiple Choice Questions

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. What process has had the greatest impact on global photosynthesis in the past 10,000 years

Climate change correct incorrect

Pollution correct incorrect

Agriculture correct incorrect

Drought correct incorrect

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. What is the most important type of food crop?

Potatoes correct incorrect

Cereals correct incorrect

Legumes correct incorrect

Oilseeds correct incorrect

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. What is the rhizosphere?

Part of the ocean correct incorrect

A tropical habitat correct incorrect

An alpine ecosystem correct incorrect

The subterranean ecosystem correct incorrect

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. Why is photosynthetic CO2 fixation so inefficient?

Due to the inefficiency of Rubisco correct incorrect

Due to the inefficiency of the light reactions correct incorrect

Due to the inefficiency of chloroplasts correct incorrect

Due to the effects of climate change correct incorrect

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. Which one of the following is being used for artificial photosynthesis?

Photovoltaic cells correct incorrect

Photocatalytic algae correct incorrect

Photoelectrochemical cells correct incorrect

Photosensitive LEDs correct incorrect

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. What is the major advantage of C4 photosynthesis?

Increasing the ability to harvest sunlight in the shade correct incorrect

Increasing the efficiency of the light reactions correct incorrect

Increasing photosynthesis at high temperatures correct incorrect

Increasing the CO2 concentration at the Rubisco active site correct incorrect

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. Will an increasing CO2 concentration benefit plants?

Yes, in some cases correct incorrect

No. It is a greenhouse gas that will have harmful effects correct incorrect

No. It can poison photosynthesis correct incorrect

No. It will increase plant diseases correct incorrect

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. Which of the following crops can fix atmospheric nitrogen?

Cereals correct incorrect

Tubers correct incorrect

Fruits correct incorrect

Legumes correct incorrect

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. About what proportion of plants is estimated to be at risk due to climate change and other human factors?

Over 90% correct incorrect

About half correct incorrect

About 10% correct incorrect

All of them correct incorrect

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. Which group of crops is being targeted in the engineering of nitrogen fixation?

Spices correct incorrect

Fruit trees correct incorrect

Legumes correct incorrect

Cereals correct incorrect