Subsequently, the slower growth rate compared with littermates, retention of puppy coat, and lack of
primary guard hairs gradually become evident.
Teacher Answer Key Topics Include: • plant systems: roots and shoots • plant tissues: dermal, vascular, ground • epidermis • trichomes • xylem • phloem • plant cell types: parenchyma, collenchyma, sclerenchyma • fibrous roots • taproots • root
hairs • root cap • stems • leaves • palisade mesophyll • spongy mesophyll • cuticle • stomata •
guard cells • meristems •
primary growth • secondary growth • vascular cambium • cork cambium • wood • tree rings • bark • mycorrhiza • legumes • tracheids • vessel elements • transpiration • sieve - tube members • companion cells • pressure - flow hypothesis • parasitic plants • carnivorous plants • epiphytes • hormones • auxins • phototropism • gravitropism • thigmotropism • cytokinins • gibberellins • ethylene • abscisic acid • photoperiodism • desert plants • plant defenses Happy Teaching!