AQA GCSE Biology paper 2
, "An echidna can dilate and constrict blood vessels in its skin.
Explain how the dilation of blood vessels in the skin can help to decrease body
temperature. - CORRECT ANSWER -more blood flow near surface
- so more heat is lost from the blood
- cools blood which cools the body"
"The athlete's energy intake each day from food was 20 000 kJ.
Evaporation of 1cm^3 sweat requires 2.5 kJ of energy.
40% of the athlete's daily energy intake was used to evaporate sweat.
1 Calculate the volume of sweat the athlete lost each day.
Give your answers in dm^3
1dm^3 = 1000 cm^3 - CORRECT ANSWER 20 000 x x 2.5 = 3200 cm^3
= 3.2 dm^3
Volume of sweat lost in one day = 3.2 dm^3"
"Suggest why the athlete was advised to take salt tablets every day - CORRECT
ANSWER to replace ions lost in sweat."
"Students investigated the response of plant shoots to one-sided light.
Suggest two control variables the students should have used in their investigation. -
CORRECT ANSWER same volume of water
same type of plant"
"Describe how experiment B and experiment C acted as controls for the investigation -
CORRECT ANSWER B shows response is due to light
C shows response is due to one-sided light"
"Give two ways that a person can reduce the chance of developing type 2 diabetes -
CORRECT ANSWER more exercise
eat a low carbohydrate diet"
"Name three harmful substances that could cause water pollution
Do not refer to plastic or to litter in your answer - CORRECT ANSWER Fertiliser
Sewage
herbicide"
"Describe how substances that pollute air and water could be harmful to humans and
other living organisms - CORRECT ANSWER Air pollution
- Sulfur dioxide causes damage to leaves so less photosynthesis take place.
-damage to roots or alters ions in soil so less protein is made.
- damage to lungs which can lead to breathing difficulties.
-Carbon monoxide combines with haemoglobin so less oxygen is carried.
-Particulates blocks light leading to less photosynthesis taking place and less glucose
being made
, "An echidna can dilate and constrict blood vessels in its skin.
Explain how the dilation of blood vessels in the skin can help to decrease body
temperature. - CORRECT ANSWER -more blood flow near surface
- so more heat is lost from the blood
- cools blood which cools the body"
"The athlete's energy intake each day from food was 20 000 kJ.
Evaporation of 1cm^3 sweat requires 2.5 kJ of energy.
40% of the athlete's daily energy intake was used to evaporate sweat.
1 Calculate the volume of sweat the athlete lost each day.
Give your answers in dm^3
1dm^3 = 1000 cm^3 - CORRECT ANSWER 20 000 x x 2.5 = 3200 cm^3
= 3.2 dm^3
Volume of sweat lost in one day = 3.2 dm^3"
"Suggest why the athlete was advised to take salt tablets every day - CORRECT
ANSWER to replace ions lost in sweat."
"Students investigated the response of plant shoots to one-sided light.
Suggest two control variables the students should have used in their investigation. -
CORRECT ANSWER same volume of water
same type of plant"
"Describe how experiment B and experiment C acted as controls for the investigation -
CORRECT ANSWER B shows response is due to light
C shows response is due to one-sided light"
"Give two ways that a person can reduce the chance of developing type 2 diabetes -
CORRECT ANSWER more exercise
eat a low carbohydrate diet"
"Name three harmful substances that could cause water pollution
Do not refer to plastic or to litter in your answer - CORRECT ANSWER Fertiliser
Sewage
herbicide"
"Describe how substances that pollute air and water could be harmful to humans and
other living organisms - CORRECT ANSWER Air pollution
- Sulfur dioxide causes damage to leaves so less photosynthesis take place.
-damage to roots or alters ions in soil so less protein is made.
- damage to lungs which can lead to breathing difficulties.
-Carbon monoxide combines with haemoglobin so less oxygen is carried.
-Particulates blocks light leading to less photosynthesis taking place and less glucose
being made
