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LC Biology
LC Biology

Parts and functions of the eye

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Expermients Summary - Section B

EXPERIMENT QUESTIONS

1. (a) TEST FOR REDUCING SUGAR:

FOOD SOURCE: Glucose (monosaccharide)

CHEMICAL USED: Benedict’s solution (blue)

HEAT REQUIRED: Yes (thermostatically controlled water bath)

+ RESULT: Colour change BLUE to BRICK RED

- RESULT: No colour change (stays blue)

CONTROL: Water + Benedict’s (non-reducing sugar)

PURPOSE OF CONTROL: Acts as a comparison

1. (b) TEST FOR STARCH:

FOOD SOURCE: Potato/ Bread

CHEMICAL USED: Iodine (red/yellow), using a dropper due to small volume needed

HEAT REQUIRED: No

+ RESULT: Colour change RED/ YELLOW to BLUE/BLACK

- RESULT: No colour change (stays red/yellow)

CONTROL: Water and Iodine

1. (c) TEST FOR... (More)

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LC Biology

Ecology – Leaving Certificate Biology Terms

  • ecology – the study of living things and their environments
  • environment – everything that surrounds a living thing
  • community – all populations that live in a certain place
  • ecosystem – living and nonliving things in an environment, together with their interactions
  • population – group of the same kind of organism living in a certain place
  • habitat – place where an organism lives
  • niche – organism’s functional role, or job, in its habitat
  • limiting factors – conditions in the environment that put limits on where an organism can live
  • nitrogen-fixing bacteria – bacteria that can use nitrogen in soil to make... (More)
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Long Sightedness and Short Sightedness – The Eye

  • Retina – Light sensitive screen at the back of the eye.
  • Optic Nerve – Carries information in electrical form to the brain.
  • Cornea – Together with the lens, it forms part of the focusing system.
  • Iris – Acts like a shutter, controls the amount of light entering.
  • Ciliary Muscle – Changes the shape of the lens.

Power of Accommodation

The power of Accommodation of the eye is its ability to focus a real image of an object on the retina, whether the object is near or far.

Long Sightedness – Hypermetropia

  • Distant objects are seen clearly.
  • Near objects are focused... (More)