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       [SHARE]Science Notes
       By: _0xyg3n Date: October 27, 2011, 3:22 am
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       [center][font=arial][shadow=red,left]Science Notes
       [/shadow][/font][/center]
       Hey guys,
       Guess What!
       Im sharing my notes :)
       But they are better that 5plus6equals9's cause they have
       diagrams.
       _0xyg3n (Henry)
       [shadow=red,left]Green Machine[/shadow]
       [font=arial black]
       Seeds[/font]
       Plants produce large numbers of seeds because few successfully
       grow into mature plants. Seeds contain a new plant and a store
       of food. They are usually dehydrated and dormant.
       [font=arial black]
       Seeds Structure[/font]
       A seeds consists of an embryo (early stages of life) and
       cotyledons (Food Stores) all within a protect seed casing called
       a testra.
       Inside a seed there are either one or two cotyledons attached to
       the embryo. A plant or seed with two cotyledons is called a
       dicot, and a monocot has only one.
       The cotyledons contain energy in the form of starch, which is
       converted into glucose (a soluble sugar) that is transported
       around the seed or plant. This is what supplies the plant with
       energy.
       The embryo has a radial that develops into the main root of the
       plant (easy to remember – radial and root both start with r) and
       a plumule
  HTML http://upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Avocado_seed_diagram-en.svg/200px-Avocado_seed_diagram-en.svg.png
       [CLICK TO ENLARGE]
  HTML http://upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Avocado_seed_diagram-en.svg/1000px-Avocado_seed_diagram-en.svg.png
       The first part of the seedling to grow is the radicle. It pushes
       out through the seedcoat. It begins to absorb water and
       minerals. The radicle will become the main root of the plant.
       The plumule then pushes out of the testa. The plumule grows up
       to become the main shoot of the plant.
       Tiny leaves form on the shoot and start to grow. Fruit and pods
       help protect the seeds. They are also designed to help disperse
       (spread) the seeds away from the parent’s plants.
       Seeds need to be carried away so they don’t have to compete with
       a fully-grown plant for the water, minerals and plants they need
       to grow. Ways that seeds can be spread are winds (eg. Dandily)
       water (eg. Coconut), animals (eg bidibidi) and exploding pods
       (eg. Pods).
       [font=arial black]What is necessary for germination?[/font]
       [glow=red,2,300]Water[/glow] – As most mature seeds are dormant
       they are extremely dry. It is required that they take in large
       amounts of water. Water is required to soften the testra
       allowing the radial to push through, and is used to convert the
       starch stored in the cotyledons into a soluble sugar allowing it
       to be transported around the plant
       [glow=red,2,300]Oxygen[/glow] – Oxygen is the main source of
       energy until the plant is able to photosynthesise.
       [glow=red,2,300]Warmth[/glow] – Seeds often have a temperature
       range, within which they will germinate and they will not do so
       above or below this temperature.
       [font=arial black]Cross Section of a Leaf[/font]
       A leaf is a plant organ and is made up of a collection of
       tissues in a regular organisation. The major tissue systems
       present are:
       The epidermis that covers the upper and lower surfaces
       The mesophyll inside the leaf that is rich in chloroplasts
       (also called chlorenchyma)
       The arrangement of veins (the vascular tissue)
       These three tissue systems typically form a regular organisation
       at the cellular scale.
  HTML http://upload.wikimedia.org/wikipedia/commons/thumb/0/06/Leaf_Tissue_Structure.svg/600px-Leaf_Tissue_Structure.svg.png
       [font=arial black]
       Plants and Photosynthesis[/font]
       Plants need light and chlorophyll
       Plants can’t make starch if there is no light.
       Some plants don’t need much light eg. Ferns and mosses in a
       forest (they usualy have adaptations allowing them to make
       enough starch).
       Other plants (like tall tress, eg. Kauri and Rimu) need a lot of
       light.
       Sun Light is made up of all the colours of the rainbow.
       Chlorophyll catches Red, blue and violet in sunlight to provide
       energy for photosynthesis. Chlorophyll doesn’t need the green
       light, so it reflects it – this is why leaves look green.
       If you don’t water plants, they die because plants need water to
       make starch.
       [glow=red,2,300]Resources:[/glow]
       Seed Structure, an Introduction
  HTML http://adf.ly/3QSNi
       Wikipedia - DUH!
       Mrs Cook's Science lessons (my work book)
       Dhrushil's notes
       Please report any errors to me and I will correct it, However...
       I am not to blame for errors, Just blame Daniel.
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