February 2020 exam paper Flashcards
what is the meaning of ephemeral?
life cycle of 6-8 weeks
completes several life cycles in a season
example of an ephemeral
mouse-ear-cress “Arabisopsis thaliana”
if you were to draw a cross section of a young dicot root, what should you label (in correct order)
xylem phloem pericycle-with emerging lateral roots endodermis cortex epidermis with emerging later roots steele
where does sugar transport take place in a young dicot root?
phloem (cortex)
where is the selection of minerals taken up in a young dicot root?
root hairs
where is the production of lateral roots in a young dicot stem?
pericycle, epidermis and endodermis
what is the function of the anther?
produces/contains pollen
what is the purpose of the petals?
attract pollinators
what is the function of the ovule?
it becomes the seed at fertilisation (contains ovum)
what is the function of the stigma?
hairy/sticky to trap pollen from pollinator
what is meant by the corolla?
collection of petals
what is meant by the calyx?
collection of sepals
describe what is meant by the Law of Limiting Factors
a process has more than one input/staring material
the rate of the process will be limited by the one factor
temp/light/oxygen/water
eg: for photosynthesis to take place water/light/Co2/temp must be all optimum.
if not enough water, plant will wilt forcing stomatal closure therefore no carbon dioxide can be absorbed which is essential for the process.
Wilting also reduces surface area so little light would be intercepted.
how does light intensity affect the rate of photosynthesis?
the more light available, the rate of photosynthesis increases (up to a certain point)
The process doesn’t happen in the dark and at very low light levels the stomata close so no carbon dioxide absorbed.
what controls plant turgor?
the vacuole
