Drawing skills, angio, variables, scientific method, classification of living
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What is a cotyledon
An embryonic leaf/ seed that is a structure of stored energy
What is a monocot
A plant with one cotyledon in its seed
What does the angiosperm seed contain
The young plant embryo and stored nutrients
Where is the food of a plant stored
Within cotyledon or endosperm
Give the order of seed germination
• The radicle emerges first and grows downwards into soil • The plumule is next to emerge developing into stem and leaves • The shoot tip needs to be protected until above ground level
What happens in monocots for seed germination
A protective sheath (coloptile) leads the plumule through the soil
What happens in dicots for seed germination
The cotyledons are pulled above ground level before shoot tip emerges
Explain the seeds of flowers
Dicots - 2 cotyledons Monocots - 1 cotyledon
Explain the roots of flowers
Dicots - taproot system Monocots - fibrous root system
Explain the stems of flowers
Dicot - woody , herbaceous Monocot - herbaceous (green)
Explain the leaves of flowers
Dicots - netlike veins Monocots - parallel veins
Explain the flower parts of a flower
Dicot - multiples in 4 or 5 Monocots - multiples of 3
Why are roots seperated into different regions
Each regions has different types of plant tissue to perform specific functions
Explain the mature region of a root
Root grows wider and may produce secondary roots . Secondary roots anchor plant securely in soil Each secondary root has same structure as main root
Explain the root hair region of a root
Many very thin hairs grow out of the epidermis of the root . Individual hair only lives few days before soil rubs it off Constantly replaced by eoidermal cells of this region
Explain the region of elongation In a root
Cells formed in this region grow longer Root grows longer and pushes the tip through the soil
Explain the meristematic region
Cells constantly divide to produce new cells
Explain the root cap region of a plant
Smooth and slippery Covers tips of all roots Protects meristem from injury Helps protect root tip to slide through soil easier Cells rubbed of by soil and replaced by cells from meristem
What do root hairs grow around
The soil grains
What do root hairs actually do
Absorb water and dissolved minerals from the soil
Explain the epidermis of the root
Main function is to protect underlying tissue Outer layer of cells If increased surface area , area of absorption increases Protects inner tissues of root from damage and bacteria
Why do roots not have a waxy cuticle
Waxy cuticle prevents water loss , roots absorb water
Why do we have modified roots
Some plants have roots that are modified to perform addictions functions to the plant
Explain roots
Largest organ of the plant Root systems are as large as or larger then above ground parts of plant