plant organisation Flashcards
cell
tiny living building blocks that make up living things
tissue
a group of the same cells working together
organ
variety of different tissues working together
organ system
A group of organs that work together to perform a major function.
palisade mesophyll
contain chloroplasts for photosynthesis
absorb maximum light
spongy mesophyll
air spaces to allow gases to diffuse in and out of cells
stomata
only open for photosynthesis in daylight; at night they close to reduce loss of water vapour.
xylem and phloem
transport minerals, water and food around the plant
Meristem tissue
able to differentiate into to many different types of plant cell, allowing plant to grow
what does the phloem transport
food to the rest of the plant for storage or immediate use
what does the xylem transport
water and mineral ions from the roots to the stem and leaves
what is the phloem made of
columns of elongated cells, pores in the end walls allow cell sap to flow through
what is the xylem made of
dead cells with a hole down the middle, strenghthned with lignin
what is the process of the phloem
translocation, up and down
what is the process of the xylem
transpiration stream
