Science Tournament - Eyes

When a person looks at an object, which part of the eye will change in thickness so that light can be focused onto the retina? 當我們觀看一個物體時，眼內的哪個部分會改變厚度，從而把光線聚焦到視網膜上？

• Iris 虹膜

• Lens 晶狀體

• Cornea 角膜

• Focusing muscles 視神經

• (1)

• (2)

• (1) and (3)

• (1), (2) and (3)

What is the function of focusing muscle? 對焦肌肉的功能是甚麼？

• It focuses light. 把光線聚焦

• It controls the size of the pupil. 控制瞳孔的大小

• It changes the thickness of the lens. 調節晶狀體的厚度

• It squeezes teardrops out of the eyes. 把眼淚擠出眼睛

Which of the following combinations about cells P and Q is correct?

以下哪一個有關細胞P和細胞Q及其功能的組合是正確的？

• Cells P : rod cells - Help us see different colours

  細胞P：視桿細胞 - 產生彩色影像

• Cells P : cone cells - Give black and white vision

  細胞P：視錐細胞 - 產生黑白影像

• Cells Q : rod cells - Give black and white vision

  細胞Q：視桿細胞 - 產生黑白影像

• Cells Q: cone cells - Help us see different colours

  細胞Q：視錐細胞 - 產生彩色影像

We cannot perceive the image that falls on the blind spot, because 我們不能看見落在眼球盲點上的影像，這是因為

• no image can be formed on the blind spot. 影像不能在盲點上形成

• the light-sensitive cells cannot sent signals to the brain. 感光細胞不能把信息傳送到腦

• there are no light-sensitive cells on the blind spot. 盲點上沒有感光細胞

• it is where the optic nerve leaves the eye. 盲點位於視神經離開眼球的位置

• (1)

• (2)

• (1) and (3)

• (2) and (3)

What kind of eye defect will result if structure P becomes cloudy?

如果組織P變得混濁，眼睛會出現甚麼毛病？

• Cataract 白內障

• Short sight 近視

• Long sight 遠視

• Colour-blindness 色盲

• (i) Near近處 (ii)in front of前

• (i) Near近處 (ii)Behind後

• (i) Distant遠處 (ii)in front of前

• (i) Distant遠處 (ii)Behind後

Which structures in the eye can change shape? 眼睛的哪部分可以改變形狀呢？

• (1) and (2)

• (1) and (3)

• (2) and (3)

• (1), (2) and (3)

• (1)

• (1) and (2)

• (2) and (3)

• (1), (2) and (3)