Animals and plants respond to changes in their environment. The mammalian eye contains photoreceptor cells which respond to light. The photographs show a grey-bellied night monkey and a squirrel monkey. (Source: © rod williams/Alamy Stock Photo) (Source: © Jesse Kraft/Alamy Stock Photo) The grey-bellied night monkey is active at night and the squirrel monkey is active during the day. Rod cells are photoreceptors located in the retina. Rod cells detect low light intensities. Cone cells are also photoreceptors located in the retina. They are responsible for colour vision and require higher light intensities. The numbers of different photoreceptors in the retina of one eye of each of these two species of monkey were compared. The results are shown in the table. Answer ..................... (ii) Explain why there is a difference in the numbers of rod cells and cone cells in the retinas of the grey-bellied night monkey and the squirrel monkey. (3) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................
Exam No：wbi15-01-que-20240608 Year：2024 Question No：3(a)(ii)
Answer:
An explanation that includes three of the following points:
- rod cells can detect low light intensities / cone cells require higher light intensities (for colour vision) (1)
- squirrel monkey has more cones as active \{during the day / when there is more light\} (1)
- the \{grey bellied / night\} monkey has \{fewer cone cells / more rod cells\} as it \{is active at night / needs to see in dark\} (1)
- both monkeys need to be able to see colour (to find food) therefore both have similar order of magnitude of cone cells (1)
- rod cells can detect low light intensities / cone cells require higher light intensities (for colour vision) (1)
- squirrel monkey has more cones as active \{during the day / when there is more light\} (1)
- the \{grey bellied / night\} monkey has \{fewer cone cells / more rod cells\} as it \{is active at night / needs to see in dark\} (1)
- both monkeys need to be able to see colour (to find food) therefore both have similar order of magnitude of cone cells (1)
Knowledge points:
CH8 – Coordination, Response and Gene Technology
Solution:
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