root - 

absorb water from the soil

stem - 

provide support and transport water

leaf - 

absorb sunlight

root hair cell - 

absorb water and minerals from the soil

xylem - 

transport water from the roots up to the rest of the plant

phloem - 

transport sugar from the leaves to the rest of the plant

palisade cell - 

absorb sunlight for photosynthesis

long thin projection - 

increase surface area to absorb water

lots of mitochondria - 

to release energy for active transport of minerals

large vacuole - 

to store lots of water