Photosynthesis practice test
18. Which process illustrates a feedback mechanism in plants? A. Chloroplasts take in more nitrogen, which increases the rate of photosynthesis. B. Chloroplasts release more oxygen in response to a decreased rate of photosynthesis. C. Guard cells change the size of leaf openings, regulating the exchange of gases. D. Guard cells release oxygen from the leaf at night.
C
4. Eating sweet potato provides energy for human metabolic processes. The original source of this energy is the energy A. in protein molecules stored within the potato B. from starch molecules absorbed by the potato plant C. made available by photosynthesis D. in vitamins and minerals found in the soil
C
11. Which process usually uses carbon dioxide molecules? A. cellular respiration B. asexual reproduction C. activetransport D. autotrophic nutrition
D
2. Which activity occurs in the process of photosynthesis? A. Chemical energy from organic molecules is converted into light energy. B. Organic molecules are obtained from the environment. C. Organic molecules are converted into inorganic food molecules. D. Light energy is converted into the chemical energy of organic molecules.
D
3. Photosynthesis is the process by which A. the potential energy of simple sugars is transferred to ATP molecules B. simple sugars are gradually broken down to form lactic acid or alcohol C. two simple sugar molecules combine to form maltose and water D. light energy is converted into the chemical energy of simple sugars
D
10. Leaves of green plants contain openings known as stomates, which are opened and closed by specialized cells allowing for gas exchange between the leaf and the outside environment. Which phrase best represents the net flow of gases involved in photosynthesis into and out of the leaf through these openings on a sunny day? A. carbon dioxide moves in; oxygen moves out B. carbon dioxide and oxygen move in; ozone moves out C. oxygen moves in; nitrogen moves out D. water and ozone move in; carbon dioxide moves out
A
12. The green aquatic plant represented in the diagram below was exposed to light for several hours. Which gas would most likely be found in the greatest amount in the bubbles? A. oxygen B. nitrogen C. ozone D. carbon dioxide
A
13. The diagram below illustrates the movement of materials involved in a process that is vital for the energy needs of organisms. The process illustrated occurs within A. chloroplasts B. mitochondria C. ribosomes D. vacuoles
A
16. The photograph below shows a microscopic view of the lower surface of a leaf. What is the main function of the cells indicated by the black pointer? A. regulate the rate of gas exchange B. store food for winter dormancy C. undergo mitotic cell division D. give support to the veins in the leaf
A
17. The dissolved carbon dioxide in a lake is used directly by A. autotrophs B. parasites C. fungi D. decomposers
A
5. The dense needles of Douglas fir trees can prevent most light from reaching the forest floor. This situation would have the most immediate effect on A. producers B. carnivores C. herbivores D. decomposers
A
8. Which process is directly used by autotrophs to store energy in glucose? A. diffusion B. photosynthesis C. respiration D. active transport
B
1. An inorganic molecule required by green plants for the process of photosynthesis is A. oxygen B. starch C. carbondioxide D. glucose
C
14. For which organic compounds must information be encoded in DNA for green plants to synthesize the other three compounds? A. sugars B. starches C. fats D. proteins
C
9. Organisms that have the ability to use an atmospheric gas to produce an organic nutrient are known as A. herbivores B. decomposers C. carnivores D. autotrophs
D
15. Which statement describes all enzymes? A. They control the transport of materials. B. They provide energy for chemical reactions. C. They affect the rate of chemical reactions. D. They absorb oxygen from the environment.
C
6. The diagram represents part of a life process in a leaf chloroplast. If the process illustrated in the diagram is interrupted by a chemical at point X, there would be an immediate effect on the release of A. chlorophyll B. nitrogen C. carbondioxide D. oxygen <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> </head> <body> <div class="page" title="Page 2"> </div> </body> </html>
D
7. The equation below represents a summary of a biological process. carbon dioxide + water → glucose + water + oxygen This process is completed in A. mitochondria B. ribosomes C. cellmembranes D. chloroplasts
D
