PLANT SCIENCE Ms Tenneson 2015 Major Plant Organs
- Slides: 27
PLANT SCIENCE Ms. Tenneson 2015
Major Plant Organs Roots Leaves Stems Fruit Flowers
Types of Root Systems
ROOT PARTS Root hairs Root cap Meristem
Parts of Root Systems n Root Hairs- involved in absorption of nutrients from the soil n Root Cap & Meristemconducting tissue, involved in gathering moisture & nutrients for the plant
Leaf parts blade petiole midrib apex base margin stomata
LEAF PARTS
Leaves n Food manufacturing factory of the plant which performs Photosynthesis and contains the green pigment, Chlorophyll
LEAF TYPES simple compound needle simple leaves
Leaf arrangements simple leaves
Leaves compound leaves
STEMS central support structure of the plant
STEM PARTS buds nodes internodes bark lenticels leaf scars scale scars
Bud n n A point of new growth A immature flower Terminal Bud Auxiliary Bud
Nodes & Internode n A point of growth on the stem
Bark Lenticels n Acts as a pore. Allows for gas exchange between the plant and the atmosphere
Scale / Leaf Scars n Exactly what is sounds like
FRUIT TYPES Simple: derive from a single pistil Compound: form from several ovaries at one time Accessory: develop from parts other than the ovary
Simple fleshy fruits Drupes or Pomes
Simple dry fruits
Compound fruits n n Multiple Aggregate separate flowers fused into a single structure many ovaries on a single flower
FLOWERS Flowers usually contain four main parts: sepals petals stamens pistils
FLOWER PARTS A “complete” flower has all four main parts. A “perfect” flower has stamens and a pistil.
FLOWER PARTS The pistil is composed of : Stigma: structure at the top for collecting pollen Style: support structure below the stigma Ovary: enlarged part holding the ovules (eggs) The stamens consist of: Anthers: contain the pollen Filaments: anther support
FLOWERS
PLANT CLASSIFICATIONS Plants are classified by flower and type: A monoecious plant has male and female flowers on the same plant A dioecious plant has male and female flowers on different plants a pistillate plant has only female parts A staminate plant has only male parts A hermaphroditic plant has a perfect flower
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