Give 4 specialised cells in plants.

1)Leaf - Palisade mesophyl - carry out photosynthesis - Spongey mesophyll - Allows gases to circulate for gas exchange, carry some photosynthesis - Guard cells - Open and close to control the exchange of gasses - Co2, H2O vapour, O2 2)Phloem -Sieve tubes - Transport products of photosysnthesis, sugars and amino acids from leaf to where theyre needed -Companion cells - Provide energy required for transporting substances in sieve tubes 3)Xylem - xylem vessels - Transport water and dissolved minerals from roots, up plant 4)Growing points - Merristem - Produce new cells as they divide