Cell specialisation

Cell undergoing differention to carry a specific function.

Differention- Cell change it structure or shape in order to carry specific

function efficiently.

Xylem vessel

transport water from root to the leaves

support plant(mechanical strenght)

Differentiation of xylem

• Deposition of lignint

support• Elimination of cytoplasm- dead tissue

(reduce obstacle)• Elimination of the joined end wall to form

hollow tiub.

(enable water move in one water column continuosly)

http://www.google.com.my/imgres?q=xylem+and+phloem+cells&um=1&hl=en&sa=X&gbv=2&biw=1049&bih=475&tbm=isch&tbnid=49-dcQvGRq0yxM:&imgrefurl=http://ridge.icu.ac.jp/biobk/BioBookPLANTANAT.html&docid=dqLVFmr7xBAMXM&imgurl=http://ridge.icu.ac.jp/biobk/xylem.gif&w=308&h=392&ei=dr4iT5uqCsfsrAev4pCvCA&zoom=1

Other examples

http://www.google.com.my/imgres?q=xylem+and+phloem+structure&um=1&hl=en&sa=X&gbv=2&biw=1049&bih=475&tbm=isch&tbnid=eDt5tCSa_rbaoM:&imgrefurl=http://www.tutorvista.com/content/biology/biology-iii/plant-histology/phloem.php&docid=KknhWmADODGSIM&imgurl=http://images.tutorvista.com/content/plant-histology/phloem-structure.jpeg&w=212&h=281&ei=yrwiT5flAYnZrQeW8LmXCA&zoom=1

phloem

Specialised structure

• Seive plate• Seive tube

• Thin layer of cytoplasm

Live cell

function

Transport organic substances/ food from leaves to all parts of plant.

translocation

Specialised structure

• Long projection elongate from an epidermal cell

• To increase surface area • Enable more water absorbed by

root

http://www.google.com.my/imgres?q=root+hair+cell&hl=en&rlz=1T4ADSA_enMY429MY431&biw=983&bih=350&tbm=isch&tbnid=D2m26RVpdRfY_M:&imgrefurl=http://click4biology.info/c4b/9/plant9.2.htm&docid=sB5PBLz96zGp1M&imgurl=http://click4biology.info/c4b/9/images/9.2/roothair.jpg&w=410&h=272&ei=QCwVT8_eFcrWrQeVmInuAQ&zoom=1

Specialised structure

• Contain chloroplast ( not present in others epidermal cell like onion)• Thick inner wall• Thin outer wall

A type of epidermal cell

Function of guard cell

Control opening and closing of stomata.

Function oF stoma

Epidermal tissue

SPECIALISED AND FUNCTION

• MANY CHLOROPLAST• ARRANGE VERTICALLY• CLOSELY

• TRAP MORE LIGHT TO CARRY PHOTOSYNTHESIS

Plant cell

Parenchyma

OTHERS PLANT CELL