respiration

Question 1

Respiration definition

Answer 1

Respiration is the chemical reaction that breaks down glucose by using oxygen in order to produce energy for the cell.

Question 2

Why do we need the energy?

Answer 2

Muscle contraction
Active transport
Cell division
Building large molecules

Question 3

Practical to demonstrate the production of carbon dioxide by small living organisms

Answer 3

Hydrogen carbonate indicator solution is normally orange, but turns yellow if carbon dioxide is added to it. The indicator is sensitive to small changes in carbon dioxide concentration and can be used to show production of carbon dioxide by small organism.

Question 4

Practical to demonstrate heat produced by respiration

Answer 4

SOME PEAS ARE SOAKED IN WATER FOR 24 HOURS, SO THAT THEY START TO GERMINATE. A SECOND BATCH OF PEAS IS BOILED, TO KILL THEM. EACH SET OF PEAS IS WASHED IN A ONE PERCENT BLEACH SOLUTION, WHICH ACTS AS A DISINFECTANT KILLING ANY BACTERIA PRESENT ON THE SURFACE OF THE PEAS.The peas are then rinsed twice in distilled water to remove any traces of bleach. Each batch of peas is placed in an inverted vacuum flask.