The World Of Plants
Published on Nov 18, 2015
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PRESENTATION OUTLINE
THE WORLD OF PLANTS
- Nearly all plants are autotrophs
- Organisms that produce their own food.
- All plants are eukaryotes that contain many cells.
- In addition, al, plant cells are surrounded by cell walls.
PLANT ADAPTATIONS ON LAND
- For plants to survive on land they must have water and other nutrients from their surroundings
- Retain, water, transport materials in their bodies, support their bodies, and reproduce.
NONVASCULAR PLANTS
- Plants that lack a we'll-developed system of tubes
- For transporting water and other materials are known as nonvascular plants
MOSSES
- With more than 10,000 species
- Mosses are the most diverse group of nonvascular plants
LIVERWORTS
- There are more than 8,000 species of liverworts
- Liverworts are often found growing as a thick crust on moist rocks or soil along the sides of a stream
HORNWORTS
- There are fewer than 100 species of hornworts
- Unlike mosses or liverworts, hornworts are seldom found on rocks or tree trunks
SEEDLESS VASCULAR PLANTS
- Unlike mosses, seedless vascular plants can grow tall
- Because their vascular tissue provides an effective way of transporting materials
FERNS
- There are more than 12,000 species of ferns alive today
- Like other vascular plants, ferns have true stems, roots, and leaves
Photo by blhphotography
HORSETAILS
- There are very few species of horsetails on earth
- The stems of horsetails are jointed
- Long, coarse, need-like branches grow in a circle around each joint
Photo by Ken-ichi
CLUB MOSSES
- Like ferns, club mosses have true stems, roots, and leaves.
- They also have similar life cycle
- There are only a few hundred species of club mosses today
Photo by pellaea
SEED PLANT
- Seed plants have two important characteristics
- They have vascular tissue, and they use pollen and seeds to reproduce
Photo by Dirty Bunny
VASCULAR TISSUE: PHLOEM/XYLEM
- Phloem is the vascular tissue through which food moves
- Xylem absorbs water and minerals from the soil
POLLEN AND SEEDS
- Pollen is tiny structures that contain the cells that will later become sperm cells
- Seeds are structures that contain young plants in a protective covering
Photo by inkknife_2000
SEED STRUCTURE
- A seed has three main parts an embryo, stored food, and a seed coat
SEED DISPERSAL
- After seeds have formed, they are usually scattered, sometimes far from where they were produced.
Photo by Wendy S. Smith
GERMINATION
- After a seed is dispersed, it may remain inactive for a while before it germinates
Photo by evoo73
ROOTS
- Roots anchor a plant in the ground, absorb water and minerals from the soil, and sometimes store food.
Photo by Aaron Escobar
STEMS
- The stem carries substances between the plants roots and leaves.
- The stem also provides support for the plant and holds up the leaves so they are exposed to the sun.
LEAVES
- Leaves capture the sun's energy and carry out the food-making process of photosynthesis
Photo by Jill Clardy
ANGIOSPEMS
- Produce flowers and unlike gymnosperm they produce seeds that are enclosed in fruits.
Photo by doug_wertman
MONOCOT VS DICOT
- Monocots: grasses, including corn, wheat, and rice, and plants such as lilies are monocots
- Dicot: include plants such as roses, and violets, as well as dandelions, both oaks and maples are dicots
Photo by listentoreason
