1.What metabolic pathway do plants use to fix carbon dioxide as 4 carbon molecul

Question

1.What metabolic pathway do plants use to fix carbon dioxide as 4 carbon molecule.

A. CAM

B. C4

C. C3

D. All the above

E. A and B, but not C

2.What is the natural phenomenon that regulates the temperature on planet Earth.

A. Evolution

B. Greenhouse effect

C. Mutualism

D. Phototropism

E. All of the above.

3.Which of the following are ways various plants can fix carbon dioxide.

A. CAM

B. C4

C. C3

D. All the above

E. B and C, but not A

4.Which of the following gases contributes to the Earth's greenhouse effect?

A. Carbon Dioxide

B. Methane

C. Nitrous oxide

D. All of the above.

E. A and B, but not C or D

5.Which of the following are predicted effects of Global climate change.

A. Loss of coastal wetlands

B. Increase in severity of droughts

C. Increase in medical expenditures

D. Decease agricultural production

E. All of the above

Explanation / Answer

1. E. A and B, but not C

The fisrt stable compound in C4 and CAM plants is four carbon compound (oxaloacetic acid), this is a three carbon compound in case of C3 plants (3PGA (3- Phosphoglycerate)). C4 and CAM plants are evolved as a means to avoid carbon dioxide depletion during dry condition; they can concentrate carbon dioxide up to times than C3 plants.

2. B. Greenhouse effect

3. D. All the above

4. D. All of the above.

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