nutrients

Question 1

what are the 4 functions of water in the body?

Answer 1

• control body temp
• solvent for many chemical reactions to take place
• solvent to help transport dissolved subs around the body
• essential component in cells, digestive juices, lubricants and blood

Question 2

what are the 4 functions of water in plants?

Answer 2

• raw material (help plants make food during photosynthesis)
• keeps cell turgid (plant will remain upright)
• is a medium (mineral salt are transported up the xylem)
• through phloem, water transports food subs from leaves to all parts of the plant

Question 3

procedure of startch and its negative&positive results

Answer 3

p: ad iodine solution to the sample
+ve result: turns blue-black
-ve result: remains yellow/brown

Question 4

procedure of reducing sugar and its negative&positive results

Answer 4

p: add eql vol of benedict´s solution to the sample. shake then place tube in boiling water bath for 2-3 min
+ve result: green/yellow/orange/brick-red ppt formed
-ve result: remains blue

Question 5

procedure of protein and its negative&positive results

Answer 5

p: add biuret solution then shake. wait for 5min
+ve result: turns purple/violet
-ve result: remains blue

Question 6

procedure of fats and its negative&positive results

Answer 6

p: add alcohol to sample and mix well. add water to the mixture
+ve result: white emulsion formed
-ve result: solution remains colourless

Question 7

what are the 5 reducing sugar

Answer 7

glucose
fructose
galactose
malatose
lactose