required practicals

the students cut thin sections to view in optical micro why were they thin

so a single layer can be viewed so light can pass through

why was their coverslip not sideways

to avoid cells rolling over one another

describe how to make temporary mounts

sliced. add cover slip and stain

explain why percentage change in mass of potato doesnt go down further after a point

maximum water loss

explain why you shake the test tubes every minute or so

maintain a diffuse gradient

explain why you add same amount of water in the tubes

same dilution so pigment would not be effected, so can be comparable

why do you draw solvent line before filter paper dried

cannot see solvent

why should you measure from centre of the pigment spot?

standarise over all pigements which would let comparison be made

xerophytic plants might be a little different why

thick cuticle, no pigments

what control can you have for yeast experiment

boiled yeast, glucose does not cause methylene blue to go colourless

why do you not shake it

mixing with oxygen, oxidises methylene blue

why does methylene blue go to colourless?

methlyene accepts electron from glucose

give two reason the maggots showed variaton

different ages and genetic variation

how do you get rid of earths magnetic field in this experiment

place magnets around the apparatus