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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)
- 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)
- 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)