cell diversity 2.6

Question 1

Features of Palisade cells

Answer 1

Pack together quite closely w small spaces between them for air to circulate
Large vacuole so chloroplasts are positioned nearer periphery of cell
Contain many chloroplasts
Cytoskeleton threads and motor proteins move chloroplasts to upper surface of leaf when light intensity is high

Question 2

Features of guard cells

Answer 2

Light energy used to make ATP
ATP actively transports potassium ions into guard cells
Water potential lowered, so water moves in by osmosis
Guard cells swell at tips, tips bulge
Forms stomata

Question 3

Epithelial tissue structure/function

Answer 3

Made up almost entirely of cells
Cells packed together closely by desmosomes or tight junctions
no blood vessels - receive nutrients by diffusion
Some smooth or some have projections (villi)
specialised - excretion, secretion,protection,absorption