Post on 09-Feb-2015
description
transcript
ANGIOSPERMS
Morphology vs. Anatomy
• Morphology is the study of the external structure of plants– Ex. placement of leaves along a stem
• Anatomy is the study of the internal structures of plants– Ex. the arrangement of cells and
tissue within a leaf
MONOCOTS VS. DICOTSAngiosperms are split into 2 classes
• Monocots – single cotyledon (seed leaf)
• Dicots – two cotyledons
Cotyledon - seed leaf, one in moncots and two in dicots; •primary embryonic leaf within the seed in which nutrients for the new plant are stored (left- dicot, bean; right- monocot, corn)
Roots, Stems & Leaves• Roots
– anchor the plant into the soil– Absorb minerals and water– Conduct water and nutrients– Store food
Monocot root Cross section
Dicot Root cross section
• Stems–May be vegetative (leaves)
Stems may be floral (flowers)
Stems– Have alternation of nodes (points at
which leaves are attached)– Have internodes (stem segments b/w
nodes)
Modified Stems• Stolons are horizontal stems that
grow along surface ex. strawberry runners
• Rhizomes are horizontal stems that grow underground ex. Irises
• Tubers are enlarged ends of rhizomes that store food ex. potatoes
• Bulbs are vertical, underground shoots with fleshy leaf bases modified food storage
Monocot stem cross section
Dicot stem cross section
• Leaves– Main photosynthetic organs
of plants– Consist of a blade and a
stalk (petiole) which joins the leaf to the stem
– Grasses and many monocots lack petioles
• Some monocots have petioles
Venation• Monocots have parallel major veins that run
the length of the leaf blade• Dicots generally have a multibranched
network of major veins• All leaves have numerous minor cross veins
Modified Leaves
Spines, thorns and pricklesTendrils
SUMMARY
WHAT DO I NEED TO KNOW• Unifying characteristics of gymnosperms • Unifying characteristics of angiosperms• Explain how gymnosperms are adapted
for survival in a land environment with respect to the following– Alternation of generation– Roots– Stems– Leaves– seeds– Pollen– Vascular tissue
• Use specimens to differentiate between monocots and dicots
• Describe how angiosperms are adapted for survival in a land environment with respect to the following– Alternation fo generations– Flowers– Pollen– Enclosed seeds– Fruit– Roots– Stems– Leaves– Vascular tissue
• Compare the ways in which mosses, ferns, gymnosperms and angiosperms have adapted to a land environment
• TEXT– Read all the following…– Ch 22 all sections– Ch 23 most pictures, 23-4(modified roots),23-
5,23-7– Ch 25-1,25-2– Answer the following questions…– Page 484&485 all– Page 514&515 (mc#2,TF#1,2,4,5,6,8
WR#1,4 CM#3,4,6 CCT#2,3,4,5,7,8)– Page 548&549 (mc#1-4,7,8 TF#1,3-7
WR#1,3 CM#2,3,4,5,6,8 CCT#1,2,4,6,7