plant cell organisation Flashcards
list the tissues in a leaf
epidermal
palisade mesophyll
spongy mesophyll
xylem
phloem
how are the epidermal tissues adapted to reducing water loss?
They are covered with a waxy cuticle which reduces water loss by evaporation.
what feature of the upper epidermis means light can pass through to the palisade layer?
It is transparent so that light can pass through it to the palisade layer.
Why does the palisade mesophyll layer contain lots of chloroplasts?
Chloroplasts are where photosynthesis takes place. The palisade layer contains lots of them as they are near the top of the leaf where they can get the most light.
what do the xylem and phloem form and why?
A network of vascular bundles which deliver water and other nutrients to the leaf, and take away the glucose produced by photosynthesis. It also helps support the structure.
what are the tissues adapted for?
efficient gas exchange
what is the lower epidermis full of?
stomata which let carbon dioxide diffuse directly into the leaf
what does the spongy mesophyll have lots of?
air spaces which increase the rate of diffusion of gases
function of epidermal tissue
tissue which covers and protects the whole plant from water loss
function of palisade mesophyll tissue
the part of the leaf where most photosynthesis happens
function of spongy mesophyll tissue
in the leaf and contains big air spaces to allow gases to diffuse in and out of the cells
function of xylem and phloem
transport water, mineral ions and food around the plant
function of meristem tissue
found at growing tips of shoots and roots and is able to differentiate into lots of types of plant cell
how is palisade mesophyll adapted for its function?
contains lots of chloroplasts for photosynthesis
how is the xylem adapted for its function?
-made of dead cells which form a continuous hollow tube, allows movement of water and mineral ions from roots to leaves
-strengthened by lignin
