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The Plant Kingdom
Transcript of The Plant Kingdom
Complex Life Cycles
What is a Plant?
All plants are eukaryotes that contain many cells. In addition, plants are autotrophs, which produce their own food.
Living on Land
Most plants live on land and aren't surrounded by water.
Plants make their own food through photosynthesis.
Explain to a partner what this process is again.
For plants to survive on land, they must have ways to obtain water and other materials from their surroundings, retain water, transport materials throughout the plant, support their bodies, and reproduce successfully.
Obtaining Water and Other Materials:
Organisms NEED water to survive.
Plants must obtain water through the soil.
Because there's more water in plant cells than air, water evaporates into the air.
Plants need adaptations to reduce water loss to the air.
One common adaptation is a waxy, water proof layer called a
that covers the leaves of most plants.
Some plants have
, which is an internal system of tube like structures through which water and food move inside a plant. Those that have this tissue are called vascular plants and can grow quite tall.
Most plants have
, which are groups of similar cells that perform a specific function in an organism.
To supply cells with materials, water, nutrients and food need to be transported throughout.
In general, water and nutrients are taken up in the bottom part and food is made in the top.
Because plants need sunlight for photosynthesis, a food-making part of the plant must be exposed to sunlight.
In vascular plants, vascular tissue strengthens and supports the large bodies of the plants.
All plants undergo sexual reproduction that involves
, which occurs when a sperm cell unites with an egg cell.
A fertilized egg is called a
Plants have complex life cycles that are made up of two different stages:
: the plant produces spores, the tiny cells that can grow into new organisms.
: A spore developed. The plant produces kinds of sex cells called
--sperm cells or egg cells.