The Biology Exam - Trees Poem by Sheena Hocking

Angiosperms are hardwood trees, a gymnosperm is a conifer.
Bark's inner layer is periderm; rhytidome is bark's dead layer.
Cambium grows the girth of trees, makes annual rings each year.
Dormancy: when all growth halts because of low temperature.
Eukaryotes: bound organelles and nucleus; may be multicellular.
For every year a growth ring forms, recording conditions like weather.
Glucose is carried in the phloem for energy, growth and repairs.
Heartwood is inner, dark, and dense; sapwood is young and outer.
In plant cells nuclei, plastids, vacuoles and organelles occur.
Jelly-like fluid, cytoplasm, fills plant cells; four-fifths water.
Kinds of plant cells: parenchyma, collenchyma, sclerenchyma.
Light drives photosynthesis, but green light is doesn't work.
Meristem is growth cell tissue in cambium, root and stem.
New cells are grown: outer cambium to phloem; inner cambium to xylem.
Organelles inside the cells make energy, enzymes and hormones.
Phloem, a tree's inner bark, transports glucose from leaves to the rest of the tree.
Quietly, carbon dioxide and water turn to glucose and oxygen in chloroplasts.
Root hairs take in water and minerals and xylem sends them round the tree.
Stomata are pores beneath the leaf; carbon dioxide and oxygen pass through them.
Tracheids, dead, single celled pipes, transport water in conifers' xylem.
Unlike animal cells, rectangular plant cells have walls around them.
Vessels move water in angiosperms' xylem, although they have tracheids too.
Water is moved by xylem from roots to leaves and used for photosynthesis.
Xylem consists of layers and draws water and nutrients up through the tree.
Young trees: flexible collenchyma; old trees: hard sclerenchyma.
Zone: the cambium, or the cambial zone, lies between the phloem and xylem.