AQA Combined science biology 4 - bioenergetics

B4.1 Complete this equation for photosynthesis: water + carbon dioxide --> 

• Glucose + water
• Glucose + carbon dioxide
• Carbon dioxide + water
• Glucose + oxygen

B4.1 Photosynthesis is an ______ reaction because it absorbs energy

• Exothermic
• Endothermic

B4.1 Which of these does NOT affect the rate of photosynthesis?

• Light intensity
• Temperature
• soil mineral concentration
• CO2 concentration

B4.1 Which of the following do plants use the glucose from photosynthesis for?

• Respiration
• Store it as starch
• Produce fats, oils, cellulose and amino acids
• All of the above

B4.2 Which of these chemical reactions takes place in muscle cells during mild exercise?

• Glucose --> lactic acid
• Glucose + oxygen --> carbon dioxide + water
• Glucose --> ethanol + carbon dioxide
• Carbon dioxide + water --> glucose + oxygen

B4.2 Which of these chemical reactions takes place in muscle cells during intense exercise?

• Glucose --> lactic acid
• Glucose + oxygen --> carbon dioxide + water
• Glucose --> ethanol + carbon dioxide
• Carbon dioxide + water --> glucose + oxygen

B4.2 Which of these chemical reactions takes place in fermenting yeast cells?

• Glucose --> lactic acid
• Glucose + oxygen --> carbon dioxide + water
• Glucose --> ethanol + carbon dioxide
• Carbon dioxide + water --> glucose + oxygen

B4.2 which of the following is false?

• Anaerobic respiration is incomplete oxidation of glucose
• Anaerobic respiration produces more energy than aerobic respiration
• Anaerobic respiration in muscles creates an "oxygen debt" that must be repaid

What causes muscle cramp/fatigue?

• Build up of CO2
• Build up of O2
• Build up of lactic acid
• Lack of oxygen

B4.2.2 Why does the heart rate increase during exercise?

• supply the muscles with more oxygenated blood
• remove CO2 from the blood more quickly
• neither of these
• both of these