biology wrong

uses of water in plants

photosynthesis, support, solvent for transport, transpiration stream

what can thick, fleshy leaves do

store water

how can scientists estimate when animals were alive

compare to other fossils of known age

why may experiments with quadrants be incorrect

too few quadrants, sample may not be representative of the lawn, if not placed randomly

how to received randomness with quadrant

grid and coordinates, to achieve randomness

why different types of milk took different lengths of time to reach a ph

different concentration of fat/lipids and proteins/carbs/sugar, different amount of bacteria present, may have been pasteurised by a different process, different starting ph

why is more land being used for farming and how it has decreased biodiversity

increase population, farming crops for biofuels, peat used as compost and fuel, increased use of pesticide, deforestation, monocultures, loss of hedgerows and habitat, change in migration, fertiliser run off polluting water, using pesticide damages food chains, more carbon dixoxide and metate, climate change, acid rain, desertification

why can fMRI scanners be better at finding o9ut more about the brain damage a person has

can ask people to do tasks while taking scan, see which part of brain is active or inactive, compare with a person without Brin damage, to see where the damage is, traditional MRI scanner cannot be sued if people can’t stay still

how brain received information about light entering the eye

cells in retain sensitive to light, impulse passes along sensory neurone, along optic nerve

why biomass of insect doesn’t all become biomass of dog

carbon dioxide from respiration, urea from excretion, not all [parts of insects are absorbed or digested

why fossil records isn’t clear for older species

buried deeper and smaller, so harder to find, more likely to be destroyed by geological activity, soft bodies, so most of issue decayed, less to find, unclear when one species evolve into another species as not enough fossils found

disadvantage and advantage or mass extinction events

loss of potential, future biodiversity, reduction in range of alleles, allows evolution of new species

improve drawing of cells

• use continuous lines

• don’t draw overlaloibg cells

• draw cell walls

• don’t shade

• draw all the cells present

• draw correct cell shaes

• don’t have gaps between cells

• draw nuclei in correct locton

  • label cell part

why might tree die if roots are damaged

less absoprioton of water, lower rate of photosynthesis, damage to xylem, less water and nitrates through, less anchorage

how mitosis produces two genetically identical cells

genetic material is replaced , chromosomes are pulled apart, cytoplasm divides into two cells, set of chromosomes are identical

benefit of potassium and phosphate ions

potassium, stronger roots, phosphate, flowers and fruit growth

nettle adapted for defence

stinging hairs, harms herbivores, stop animals eating them, so less of the plant is removed

how fungi and plants protect themselves from disease

fungi, antibiotics production, kill bacteria

plants production of antibacterial chemical, kill bacteria, cell wall, tough and difficult to penetrate

order size, chromosome, nuclei, gene

• gene

• chromosome

• nucleus

need to control normally

• same volume

• same concentration

• same temperature, maintain using water bath

• repetition, 3+, calculate mean

• for same time period

what is meant by the term species

• organisms that can breed together

• successfully

how speciation occurs

• isolated

• genetic variation

• different environment

• natural selection occurs

• favourable alleles passed down

• eventually cannot interbreed successfully