- Explain how we see different colours of an object.
- Why is it that some persons cannot distinguish between different colours?
- The chick wakes up with the sunrise and sleeps by the sunset. How does it manage?
- Image of an object is formed on the retina. Retina is made up of rod and cone cells.
While rod sense brightness, the cone cells sense colour. Therefore, it is the cone cells of retinal that help us see different colours.
- Some persons cannot distinguish between different colours because they have damaged cone cells and are colour blind.
- Chicks wakes up sunrise and go to sleep at sunset. The reason is that their eyes are adapted to daylight, so they would just stumble around in the dark and not be able to see food, predators, or other dangers.
Conversely, to sleep during the day means they will not able to watch out for predators at a time they can see the best.