PARTS OF A SEED PLANT Leaf Stems Roots Seeds.
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Transcript of PARTS OF A SEED PLANT Leaf Stems Roots Seeds.
PARTS OF A SEED PLANTLeafStemsRootsSeeds
Structure of a Leaf
LeavesCaptures the sun’s energy
the food factory of the plant
produce the food used by the plant or stored for later use
Part of the Leaf (pg. 2) Cuticle; waxy waterproof coating; helps plant
retain water Surface cells: protective layer Upper Leaf Cells; Tightly packed cells. High
concentration of chloroplast Lower Leaf Cells; Widely spaced to allow carbon
dioxide (CO2) to reach cells for photosynthesis and oxygen (O2) to escape.
Vein: vascular tissue containing the Xylem & Phloem Xylem: carries water from roots to leaves Phloem: transport food made during photosynthesis.
Chloroplasts
Organelles which contain chlorophyll
located inside the food making cells
Stomates
allow the plant to breathe and transpiregive off moisture
Guard Cells
open and close the small pore on the underside of the leaf
food
manufactured in the leaves moves downward through the stem to the rootsused by the plantstored in stem or root and leaf in the form of sugar, starch or protein.
Respiration
plants respire 24 hours a dayconsume O2 and give off CO2plants produce more O2 through ps. Than they consume during respiration and growth.
Photosynthesis & Respiration
Stemstwo main functions
1. movement of water & minerals from the roots & movement of manufactured food down for storage.
2. support of leaves and reproductive structures
Stems alsoused for food storage and reproduction of plants involving cuttings
Green stems manufacture food just as leaves do
Internal Stem Structure
Cambium- separates Phloem and Xylem and produces all new cells.
Internal Stem Structure
Two typesHerbaceousWoody
Herbaceous Stem
No wood and are often soft
Woody StemDurable; made up of many
layers
RootsUsually underground functions:
anchor plant and hold upright
absorb water and minerals from soil and conduct to stem
Sometimes store foodTwo Types
Fibrous…like rye grassTaproot…like carrots!
Root Structureinternal
similar to stemsolder roots have xylem, phloem and cambium
externalroot cap
produces continuous supply of new cells
protects roots as they push through soil
Structureroot hairs
absorb moisture and minerals
small roots
SeedsAll seeds share important
similaritiesInside the seed is a plant
ready to grow
Seed Structure Three main parts
1. Embryo: The young plant that develops from the zygote or fertizilzed eggAlready contains the beginnings of
roots, stems and leavesUses the food stored in the seed to
growSome seeds are surrounded by a
structure called fruit! Yum!!!!!
SEED STRUCTURE2. Cotyledons: “Seed Leaf” The stored food
sometimes in the seed
3. Seed Coat: Outer covering of the seed. Acts as the “skin” protecting the
embryo and its food from drying out. Allows seed to remain inactive for a
long time
Seed Structures
Seed Dissection of the Lima Bean
Seed Dissection Page 11 of Packet Looking inside a seed Each team of two will get 2 SEEDS Dry seed vs Soaked seed
Draw and observe the dry seedIn the mouth or cup of warm
water
Seed Dispersal (pg. 139)Dispersed by organisms;
an animal eats a fruit and their droppings spread the seeds
Seeds enclosed on barblike structures that hook on fur
Dispersed by waterDispersed by wind