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

46. Sensory Systems

Sensory System

General Biology

46. Sensory Systems

Sensory System

Previous problemNext problem

1:42 minutes

Problem 2

Textbook Question

Evaluate the following statements according to the information presented in this chapter. Select True or False for each statement.
T/F Most human eyes have one type of rod and three types of cones.
T/F Rods are more sensitive to dim light than cones are.
T/F Nocturnal animals have fewer rods than diurnal animals.
T/F Both rods and cones use retinal and opsins to detect light.

Verified step by step guidance

Understand the function of rods and cones in the human eye: Rods are responsible for vision in low light conditions, while cones are responsible for color vision and function best in bright light.

Evaluate the statement about the types of rods and cones: Most human eyes have one type of rod and three types of cones, which are sensitive to different wavelengths of light (red, green, and blue).

Consider the sensitivity of rods and cones: Rods are more sensitive to dim light than cones, which is why they are more effective in low-light conditions.

Analyze the statement about nocturnal and diurnal animals: Nocturnal animals typically have more rods than diurnal animals to enhance their ability to see in the dark.

Examine the use of retinal and opsins: Both rods and cones use retinal and opsins to detect light, which are essential components of the phototransduction pathway.

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above

Video duration:

Play a video:

Was this helpful?

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Rod and Cone Cells

Rod and cone cells are photoreceptor cells in the retina responsible for vision. Rods are highly sensitive to low light levels and are crucial for night vision, while cones are responsible for color vision and function best in bright light. Humans typically have one type of rod and three types of cones, each sensitive to different wavelengths of light.

Sensitivity to Light

Sensitivity to light refers to the ability of photoreceptor cells to detect light intensity. Rods are more sensitive to dim light compared to cones, making them essential for vision in low-light conditions. This sensitivity allows rods to function effectively at night or in dark environments, whereas cones require brighter light to activate and provide detailed color vision.

Retinal and Opsins

Retinal and opsins are molecules involved in the phototransduction process, which is the conversion of light into electrical signals in the retina. Both rods and cones use retinal, a form of vitamin A, and opsins, proteins that bind to retinal, to detect light. The interaction between retinal and opsins triggers a biochemical cascade that ultimately leads to visual perception.