Biology Paper 2 (GCSE Edexcel
Higher) Exam Questions With Correct
Answers
Photosynthesis - ANS6CO2 + 6H2O (+ light energy) > C6H12O6 + 6O2
Carbon Dioxide + Water (+ light energy) > Glucose + Oxygen
Things needed for photosynthesis - ANSwater, sun, carbon dioxide, minerals, chlorophill
root hair cells - ANSCells in the epithelium of roots that have long extensions to increase surface area
for the absorption of water and minerals.
Phloem - ANScarries iron and food from leaf to roots
Xylem - ANScarries water from roots to leaves
Transpiration - ANSEvaporation and diffusion of water from the leaves of a plant
Things affecting transpiration - ANSlight intensity (if it's dark photosynthesis can't happen and
stomata close)
temperature
air flow (water vapour is swept away, diffusion happens faster)
Stomata - ANSTiny pores on the surface of a plant, surrounded by guard cells, allow CO2, H2O and
water vapour in transpiration to diffuse in and out
adaptations of leaves - ANS- broad = large surface area exposed to light
- palisade layer = chloroplasts near to top
- upper epidermis = transparent so light can get through to palisade layer
- xylem and phloem = provide water and take away glucose produced
, - waxy cuticle = reduce water loss
adaptations of plants - ANS- small leaves = reduces surface area for waterloss
- curled leaves = traps watervapour near to surface and reduce diffusion
- thick waxy cuticles = reduce water loss
- fleshy stem = stores water
- fewer stomata or stomata which open at night - reduce water loss
Phototropism - ANSA growth response towards light
Geotropism - ANSresponse to earth's gravity, as the growing of roots downward in the ground
Auxin - ANSa plant hormone that promotes root formation and bud growth
Uses of plant hormones - ANS- selective weedkiller = auxin disrupts growth patterns
- growing from cuttings and root powder = prouce roots rapidly
- controlling flower and fruit formation = gibberellins stimulate seed germination, stem growth and
flowering, improve fruit quality
- producing seedless fruit = gibberellins to unpollinated fruit
- ethene ripens fruit
Hormones - ANSchemical messengers created in the endocrine glands and control most major bodily
functions
endocrine system - ANSthe body's "slow" chemical communication system; a set of glands that
secrete hormones into the bloodstream
6 endocrine glands - ANSpituitary gland: regulate body conditions
thyroid gland: thyroxine - regulates metabolism, heart rate and temperature
adrenal gland: adrenaline "fight or flight"
the pancreas: insulin, regulates the blood glucose level
ovaries: oestrogen
Higher) Exam Questions With Correct
Answers
Photosynthesis - ANS6CO2 + 6H2O (+ light energy) > C6H12O6 + 6O2
Carbon Dioxide + Water (+ light energy) > Glucose + Oxygen
Things needed for photosynthesis - ANSwater, sun, carbon dioxide, minerals, chlorophill
root hair cells - ANSCells in the epithelium of roots that have long extensions to increase surface area
for the absorption of water and minerals.
Phloem - ANScarries iron and food from leaf to roots
Xylem - ANScarries water from roots to leaves
Transpiration - ANSEvaporation and diffusion of water from the leaves of a plant
Things affecting transpiration - ANSlight intensity (if it's dark photosynthesis can't happen and
stomata close)
temperature
air flow (water vapour is swept away, diffusion happens faster)
Stomata - ANSTiny pores on the surface of a plant, surrounded by guard cells, allow CO2, H2O and
water vapour in transpiration to diffuse in and out
adaptations of leaves - ANS- broad = large surface area exposed to light
- palisade layer = chloroplasts near to top
- upper epidermis = transparent so light can get through to palisade layer
- xylem and phloem = provide water and take away glucose produced
, - waxy cuticle = reduce water loss
adaptations of plants - ANS- small leaves = reduces surface area for waterloss
- curled leaves = traps watervapour near to surface and reduce diffusion
- thick waxy cuticles = reduce water loss
- fleshy stem = stores water
- fewer stomata or stomata which open at night - reduce water loss
Phototropism - ANSA growth response towards light
Geotropism - ANSresponse to earth's gravity, as the growing of roots downward in the ground
Auxin - ANSa plant hormone that promotes root formation and bud growth
Uses of plant hormones - ANS- selective weedkiller = auxin disrupts growth patterns
- growing from cuttings and root powder = prouce roots rapidly
- controlling flower and fruit formation = gibberellins stimulate seed germination, stem growth and
flowering, improve fruit quality
- producing seedless fruit = gibberellins to unpollinated fruit
- ethene ripens fruit
Hormones - ANSchemical messengers created in the endocrine glands and control most major bodily
functions
endocrine system - ANSthe body's "slow" chemical communication system; a set of glands that
secrete hormones into the bloodstream
6 endocrine glands - ANSpituitary gland: regulate body conditions
thyroid gland: thyroxine - regulates metabolism, heart rate and temperature
adrenal gland: adrenaline "fight or flight"
the pancreas: insulin, regulates the blood glucose level
ovaries: oestrogen
