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Photosynthesis and Autotrophic Nutrition, Study Guides, Projects, Research of Plant physiology

A series of questions and diagrams related to the process of photosynthesis and autotrophic nutrition in green plants. It covers topics such as the role of inorganic molecules, the net flow of gases, the function of chloroplasts, and the production of glucose.

Typology: Study Guides, Projects, Research

2023/2024

Available from 03/26/2024

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ACTUAL EXAM Photosynthesis: Practice Questions #1
1. An inorganic molecule required by green plants for the process of photosynthesis is
A. oxygen
B. starch
C. carbon dioxide
D. glucose
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.
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
4. Eating a 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
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
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ACTUAL EXAM Photosynthesis: Practice Questions

  1. An inorganic molecule required by green plants for the process of photosynthesis is A. oxygen B. starch C. carbon dioxide D. glucose
  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.
  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
  4. Eating a 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
  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
  1. 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. carbon dioxide D. oxygen
  2. 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. cell membranes D. chloroplasts
  3. Which process is directly used by autotrophs to store energy in glucose? A. diffusion B. photosynthesis C. respiration D. active transport
  1. 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
  2. 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
  3. 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.
  4. 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

  1. The dissolved carbon dioxide in a lake is used directly by A. autotrophs B. parasites C. fungi D. decomposers
  2. 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.
  3. An enzyme known as rubisco enables plants to use large amounts of carbon dioxide. This enzyme is most likely active in the A. nucleus B. vacuoles C. mitochondria D. chloroplasts
  4. Starch molecules present in a maple tree are made from materials that originally entered the tree from the external environment as A. enzymes B. simple sugars C. amino acids D. inorganic compounds
  1. The diagram below represents a cross section of part of a leaf. Which life functions are directly regulated through feedback mechanisms associated with the actions of the structures labeled X? A. excretion and immunity B. digestion and coordination C. circulation and reproduction D. respiration and photosynthesis
  2. The diagram below represents a biological process. Which set of molecules is best represented by letters A and B? A. A : oxygen and water B : glucose B. A : glucose B : carbon dioxide and water C. A : carbon dioxide and water B : glucose D. A : glucose B : oxygen and water
  3. A green plant is kept in a brightly lighted area for 48 hours. What will most likely occur if the light intensity is then reduced slightly during the next 48 hours? A. Photosynthesis will stop completely. B. The rate at which nitrogen is used by the plant will increase. C. The rate at which oxygen is released from the plant will decrease. D. Glucose production inside each plant cell will increa
  1. If the leaves of a geranium plant receive an adequate supply of raw materials, which graph below shows how the rate of photosynthesis is related to increasing light intensity received by the plant? A. B.^ C. D.

An organism was added to a test tube containing water, which was then sealed and placed in sunlight. The graph shows an increase in the oxygen content of the test tube over a period of time. Which type of organism was most probably added to the test tube? A. fresh-water animal B. green alga C. ameba D. virus

  1. Much of the carbon dioxide produced by algae is not excreted as a metabolic waste because it A. can be used for photosynthesis B. cannot pass through cell membranes C. is needed for aerobic respiration D. is used for the hydrolysis of proteins
  2. Most of the oxygen gas present in the atmosphere is produced as a result of A. photosynthesis B. cellular respiration C. dehydration synthesis D. decomposition

Which statement best explains the results of this experiment? A. The rate of photosynthesis is affected by variations in the light. B. In all environments light is a vital resource. C. The activities of bacteria and algae are not related. D. Uneven numbers and types of species can upset ecosystem stability.

  1. Which set of terms best identifies the letters in the diagram below? A B C A. photosynthesis inorganic molecules decomposition B. respiration organic molecules digestion C. photosynthesis organic molecules respiration D. respiration inorganic molecules photosynthesis
  2. Base your answer to the question on the information and diagram below and on your knowledge of biology. A small water plant (elodea) was placed in bright sunlight for five hours as indicated below. Bubbles of oxygen gas were observed being released from the plant

Since oxygen gas is being released, it can be inferred that the plant is A. producing glucose B. making protein C. releasing energy from water D. carrying on active transport

  1. Base your answer to the question on the information and diagram below and on your knowledge of biology. A small water plant (elodea) was placed in bright sunlight for five hours as indicated below. Bubbles of oxygen gas were observed being released from the plant. What substance did the plant most likely absorb from the water for the process that produces the oxygen gas? A. dissolved nitrogen B. carbon dioxide C. an enzyme D. a hormone
  2. The diagram below represents an autotrophic cell. For the process of autotrophic nutrition, the arrow labeled A would most likely represent the direction of movement of A. carbon dioxide, water, and solar energy B. oxygen, glucose, and solar energy C. carbon dioxide, oxygen, and heat energy D. glucose, water, and heat energy

Which row in the chart correctly identifies the letters in the diagram? Row A.

A

ribosome B oxygen

C

carbon dioxide

D

water B. mitochondrion water oxygen protein C. nucleus nitrogen carbon starch D. chloroplast carbon dioxide water glucose

  1. Which phrase, if placed in box X , would correctly complete the flowchart shown below? A. Increased use of starch in root cells B. Increased concentration of glucose in leaf cells C. Decreased ATP in root cells D. Decreased concentration of oxygen in leaf cells
  2. The leaves of a plant are dotted with openings known as stomata. When open, stomata allow the plant to exchange gases and allow moisture to evaporate, helping to draw water from the roots up into the plant. These activities help the plant to A. produce light energy B. maintain homeostasis C. decompose organic matter D. synthesize minerals
  3. Certain organisms are able to store energy from the Sun in energy-rich compounds. Which event best illustrates this activity? A. A fox captures and eats a young rabbit. B. A caterpillar is eaten by a blackbird. C. Lettuce produces organic substances. D. Bacteria change organic material into simple nutrients.
  1. The diagram below represents a cross section of a leaf of a green plant, showing an opening (stomate) in the lower surface. A stomate in the lower surface of the leaf has a function most similar to the function of which cell structure? A. cell membrane B. vacuole C. ribosome D. nucleus
  2. A biological process that occurs in plants is represented below. Which row in the chart below identifies the lettered substances in this process? Row A. B. C. D.

A B C D

enzymes oxygen carbon glucose dioxide carbon glucose oxygen enzymes dioxide glucose enzymes oxygen carbon dioxide oxygen glucose carbon dioxide enzymes

  1. Scientists studying ocean organisms are discovering new and unusual species. Which observation could be used to determine that an ocean organism carries out autotrophic nutrition? A. Chloroplasts are visible inside the cells. B. Digestive organs are visible upon dissection. C. The organism lives close to the surface. D. The organism synthesizes enzymes to digest food.

Answer Key

  1. C 26. C
  2. D 27. B
  3. D 28. A
  4. C 29. A
  5. A 30. B
  6. D 31. C
  7. D 32. D
  8. B 33. A
  9. D 34. C
  10. A 35. A
  11. D 36. B
  12. A 37. A
  13. A 38. A
  14. D 39. B
  15. C 40. D
  16. A 41. D
  17. A 42. B
  18. C 43. B
  19. D 44. C
  20. D 45. A
  21. B 46. B
  22. D 47. C
  23. D 48. B
  24. C 49. D
  25. C 50. A