U.3 The plant kingdom (Parts of a plant (Flowers:
Are the reproductive…
U.3 The plant kingdom
Parts of a plant
Are the reproductive organs. Gametes are produced inside the flower. The result of the sexual reproduction is a seed. Parts:
- Corolla, that is formed by petals
- Stamens Are the male reproductive organs. It consist of a filament and an anther, in the anther there are pollen sacks.
- Pistil is the female reproductive organ, and there is the stigma, the style and the ovary where are the ovules.
- Penducle join the flower to the stem
- Sepals that form the calyx.
Depending in its structure it can be:
- Complete or incomplete flowers in which lack the calyx and corolla
- Hermaphrodite or unisexual plants which have the both sexual organs or not.
Are vital to do the photosynthesis, also are involved in the gas exchange.
- Photosynthesis, with the chloroplasts, this organs have a green pigment called chlorophyll.
Water + Mineral salts + CO2 + Sunlight = organic matter
- Transpiration, water that has not released with the photosynthesis is released outside trough the stomata.
Is the part that keep the plant upkeep and the leaves grow from branches.
Have 2 main functions:
- Transport substances, the xylem transport the crude sap, and the phoem transport the phoem sap.
- Support the leaves
Generally grows underground and is a one the stem. It don’t contribute to the photosynthesis process. His functions are:
- Absorb mineral salts and water
- To give stability to the plant
- Store substances
Are vascular,non-flowering plants. They live in dark, humid locations. Have an alternating reproduction, like bryophytes
Bryophytes: Hepatic plants and mosses
Are non-flowering plants and have non conductive vessels or undeveloped vessels. They are the most ancient plants. It reproduction can be sporophyte (with spores) and gametophyte (with gametes )
Plants are multicellular, and perform autotrophic nutrition. They share that characteristic with some algae. And are like 500 million years ago.
Plants do the photosynthesis process is a very important process
- To feed themselves
- Are food of terrestrial living things
Plants form tissues for:
- Chlorophyll for photosynthesis
- Supporting to keep the plant upright.
- Protect from the outside
- ConductiveTransport sap
Spermatophytes have specialized organs such us:
- Roots to absorb water and mineral salts
- Stems to transport sap
- Leaves to do the photosynthesis
- flowers to do sexual reproduction
They can be classified by:
If we combine that criteria they can be bryophytes, pteridophytes, or spermatophytes.Example:
- The presence of a flower
- The presence of conducting vessels
Plants with seeds
Spermatophytes reproduce by seeds. There are 2 types:
- Gymnosperm (trees, flowers, pollen)
- Angiosperms (dry fruits, fleshy fruits)