Specialised cells Flashcards
name 6 specialised cells
palisade mesophyll cell
sperm
egg
white blood cell
red blood cell
what is palisades a major site of?
photosynthesis
what shape are palisades?
cylindrical
how are palisades arranged?
at right angles to the upper epidermis
why are there long narrow gaps between palisade cells?
for air to circulate for gas exchange
why are the cellulose cell walls (in palisades) thin and transparent?
easy for gas exchange
why is the chloroplast near the edge of a palisade cell?
can absorb more light
how many chromosomes does a sperm contain?
23 pairs (haploid nucleus)
what is the acrosome purpose?
enzyme digest a path through outer membrane of egg
why does a sperm cell have a tail?
mobility
how many chromosomes does an egg cell contain?
23 pairs (haploid nucleus)
what does the egg cells protective layer supply?
protein for the fertilised egg
why does a root hair cell have a large surface area?
increases rate of absorption of water and ions
why does root hair cells have mitochondria?
provide energy for active transport of ions
what are the two types of white blood cells?
lymphocytes
neutrophils (phagocytes)
