Use of biological resources

Question 1

what is yoghurt

Answer 1

yoghurt is milk which has been fermented by a certain species of bacteria called lactobacillus

Question 2

what is the use of lactobacillus in Yoghurt

Answer 2

Digest milk proteins an ferment the lactose (sugar) producing lactic acid

Question 3

what are the advantages of using lactobacillus

Answer 3

Lowers/decreases the PH
Preserves it
gives it a longer shelf life

Question 4

what is the role of yeast in bread making

Answer 4

Allows the bread to rise

enzymes break down the carbohydrates in the flour into sugar

Yeast uses these sugars aerobically producing carbon dioxide+ water

when the yeast runs out of oxygen it switches to anaerobic respiration this is known as fermentation
producing carbon dioxide and ethanol

Question 5

what is the name of the process when yeast switches to anaerobic respiration

Answer 5

Fermentation

Question 6

What is the process of selective breeding

Answer 6

• choose the individual with the desired characteristics/features
• You let only these individuals reproduce
• You choose the offspring with the desired feature/ characteristics
• only allow these to reproduce
• repeat

Question 7

what are the issues with selective breeding

Answer 7

• no genetic variation
• this causes them to be vulnerable to genetic disorders and disease