BIO PRAC Flashcards
1
Q
testing for starch in leaf:
why is it important to soak the leaf in alcohol
A
removes chlorophyll
decolourise
see colour change for iodine test more clearly
2
Q
testing for starch in leaf:
why is it important to boil the leaf in water
A
soften the leaf
more permeable for iodine solution to enter the leaf
3
Q
what is the use of a photometer
A
used to measure the rate of transpiration
4
Q
what is the assumption when the potometer is used and how is it different from reality
A
assumption: the rate of absorption is proportional to the rate of transpiration
reality: assumption is wrong because water is also lost through photosynthesis and leaf cells when maintaining turgidity
