Table of contents

1. Introduction to Biology2h 42m
2. Chemistry3h 37m
3. Water1h 26m
4. Biomolecules2h 23m
5. Cell Components2h 26m
6. The Membrane2h 31m
7. Energy and Metabolism2h 0m
8. Respiration2h 40m
9. Photosynthesis2h 49m
10. Cell Signaling59m
11. Cell Division2h 47m
12. Meiosis2h 0m
13. Mendelian Genetics4h 44m
14. DNA Synthesis2h 27m
15. Gene Expression3h 6m
16. Regulation of Expression3h 31m
17. Viruses37m
- Viruses
  37m
18. Biotechnology2h 58m
19. Genomics17m
- Genomes
  17m
20. Development1h 5m
21. Evolution3h 1m
22. Evolution of Populations3h 53m
23. Speciation1h 37m
24. History of Life on Earth2h 6m
25. Phylogeny2h 31m
26. Prokaryotes4h 59m
27. Protists1h 12m
28. Plants1h 22m
29. Fungi36m
- Fungi
  19m
- Fungi Reproduction
  17m
30. Overview of Animals34m
- Overview of Animals
  34m
31. Invertebrates1h 2m
32. Vertebrates50m
33. Plant Anatomy1h 3m
34. Vascular Plant Transport1h 2m
- Water Potential
  1h 2m
35. Soil37m
- Soil and Nutrients
  20m
- Nitrogen Fixation
  16m
36. Plant Reproduction47m
- Flowers
  33m
- Seeds
  14m
37. Plant Sensation and Response1h 9m
38. Animal Form and Function1h 19m
39. Digestive System1h 10m
- Digestion
  1h 3m
- Blood Sugar Homeostasis
  7m
40. Circulatory System1h 49m
41. Immune System1h 12m
42. Osmoregulation and Excretion50m
- Osmoregulation and Excretion
  50m
43. Endocrine System1h 4m
- Endocrine System
  1h 4m
44. Animal Reproduction1h 2m
- Animal Reproduction
  1h 2m
45. Nervous System1h 55m
- Neurons and Action Potentials
  1h 8m
- Central and Peripheral Nervous System
  46m
46. Sensory Systems46m
- Sensory System
  46m
47. Muscle Systems23m
- Musculoskeletal System
  23m
48. Ecology3h 11m
49. Animal Behavior28m
- Animal Behavior
  28m
50. Population Ecology3h 41m
51. Community Ecology2h 46m
52. Ecosystems2h 36m
53. Conservation Biology24m
- Conservation Biology
  24m

9. Photosynthesis

Introduction to Photosynthesis

General Biology

9. Photosynthesis

Introduction to Photosynthesis

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Multiple Choice

If the ocean's ability to absorb carbon dioxide ($\mathrm{CO_2}$) from the atmosphere weakens, which of the following is the most likely consequence?

The pH of ocean water would increase, making it more alkaline.

Atmospheric $\mathrm{CO_2}$ levels would increase, potentially intensifying global warming.

Photosynthetic rates in terrestrial plants would decrease due to less available $\mathrm{CO_2}$.

Oxygen production by marine phytoplankton would dramatically increase.

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Verified step by step guidance

Understand the role of the ocean in the carbon cycle: The ocean acts as a major carbon sink, absorbing a significant amount of atmospheric carbon dioxide (CO₂). This process helps regulate global CO₂ levels and mitigates the greenhouse effect.

Consider the consequences of reduced CO₂ absorption: If the ocean's ability to absorb CO₂ weakens, more CO₂ will remain in the atmosphere. This could lead to an increase in atmospheric CO₂ levels, which is a key driver of global warming.

Analyze the impact on ocean pH: When CO₂ dissolves in ocean water, it forms carbonic acid, which lowers the pH and makes the water more acidic. If less CO₂ is absorbed, the pH would not increase (become more alkaline); instead, it would remain stable or decrease more slowly.

Evaluate the effect on terrestrial photosynthesis: Terrestrial plants rely on atmospheric CO₂ for photosynthesis. A decrease in ocean CO₂ absorption would not directly reduce CO₂ availability for plants; in fact, atmospheric CO₂ levels would likely increase, potentially enhancing photosynthesis.

Assess the impact on marine phytoplankton: Marine phytoplankton produce oxygen through photosynthesis, but their oxygen production is not directly linked to the ocean's CO₂ absorption capacity. A dramatic increase in oxygen production is unlikely to result from reduced CO₂ absorption.