biology lesson 1.2
TRANSCRIPT
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Biology 1.2 What’s important?
4 Plant Parts:1.Flower reproductive part Contains ovules and ovary which become the seed and fruit. Seed becomes embryo and fruit provides
nutrients
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Biology 1.2 What’s important?
4 Plant Parts:1. Flower reproductive part Contains ovules and ovary which become the seed and fruit. Seed becomes embryo and fruit provides nutrients
2. Leaves – main photosynthetic part of plant where food is produced.
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2. Leaves – main photosynthetic part of plant where food is produced.
3. Stem Functions include: a. supports the leaves and flowersb. transports nutrients and water
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3. Stem Functions include:
a. supports the leaves and flowersb. transports nutrients and water
Two types of stems are:woody stems –
• found on trees and shrubs• are brown and rigid
herbaceous stem–• found on herbs • are green and flexible• called herbs includes flowers, and all plants
with flexible stem• Vines can be either
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3. Stem
There are 4 types of plants based on their stem:A.Trees – have woody stems, & grow tall
B. Shrubs – have woody stems, and are
shorter
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3. Stem There are 4 types of plants based on their stem:
A.Trees – have woody stems, & grow tallB.Shrubs – have woody stems, and are shorter
C. Herbs- include anything with a flexible, green stem and no tendrils. (ex. Tomato, daisy)
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3. Stem There are 4 types of plants based on their stem:
A.Trees – have woody stems, & grow tallB.Shrubs – have woody stems, and are shorterC.Herbs- include anything with a flexible, green stem and no tendrils.
D. Vines •woody or herbaceous stem•stem grows along the ground•may have tendrils to wind around post, or trees.
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3. Stem There are 4 types of plants based on their stem:A.Trees – have woody stems, & grow tallB.Shrubs – have woody stems, and are shorterC.Herbs- include anything with a flexible, green stem and no tendrils.D. Vines – can have a woody or a herbaceous stem, which grows along the ground, or may have tendrils to wind around post, or trees.
Two types of vines are:a. herbaceous vine Ex. cucumber plant
b. woody vine Ex. grape plant
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3. Stem
Two types of vines are:a. herbaceous vine Ex. cucumber plantb. woody vine Ex. grape plant
4. RootsFunctions:• Anchors the plant in soil• absorbs water, nutrients & minerals• stores food• reproduction called vegetative reproduction
which is when roots spread out and make new plants
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Vegetative Reproduction
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4. RootsFunctions:• Anchors the plant in soil• absorbs water, nutrients & minerals• stores food• reproduction called vegetative reproduction which is when roots spread out and make new plants
Types of root systemsA. taproot – main root grows straight down
w/small secondary roots growing off of the main root
Ex. carrot
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4. RootsTypes of root systems
A. taproot – main root grows straight down w/small secondary roots growing off of the main root
Ex. carrot
B. fibrous roots – the main root is small and secondary roots are many ex. grasses
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Plant parts are divided into two plant systems
Shoot system – above the ground and includes stem, flower, and leaves
Root system – part below the ground includes the roots
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More about leaves:
Parts of a leaf:•petiole – stalk that attaches blade to
stem•blade – central flat part•midrib – on many plants but not all, it is
the central vein running down the leaf (veins – carry nutrients and water)
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More about leaves:
Part of a leaf:•petiole – stalk that attaches blade to stem•blade – central part•midrib – on many plants but not all is the central vein running down the leaf (veins –
carry nutrients and water)
Three basic leaf shapes:1. broad and flat (maple, oak)2. long and narrow (onions, lilies)3. needle or scale like (pines, cedars)
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Broad leafLong, narrow
Needle - like
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Shapes of broad leaves: elliptical oval ovate (triangular) obovate (reverse of ovate) lance-shaped heart shaped arrow shaped
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Shapes of broad leaves: elliptical oval ovate (triangular) obovate (reverse of ovate) lance-shaped heart shaped arrow shaped
Types of Leaf margins (around the outside edge):1. entire – smooth edge2. toothed – jagged edge ex. Holly3. lobed - has lobes ex. oak
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Entire
Three basic leaf margins
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Divisions of leaves:Simple leaves – no division in leaf at
midrib
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Divisions of leaves:Simple leaves – no division in leaf at midrib
Compound leaves – where the midrib had dividedthe leaf completely and each side looks identical.