Tuesday, 2 October 2012

classifying the plants



Special Structure




Turgor Pressure

Turgor Pressure:
The pressure exerted by water inside the cell against the cell wall.


For Non-woody plants (herbaceous plants),
the stems are supported by the turgidity/ turgor pressure of plant cells.







Plants need water to maintain turgor pressure, which allows the non woody parts of plants to expand and remain rigid. When the plants lack of water, the leaves are droopy.  

When the water flowing into the plants tissues, a turgor pressure exerted on the plant cell wall and this makes plant cells to become turgid. Then, the plants are able to stand upright and do not wilt. 











Other resources:

Turgor Pressure

1. Animation 
2. Wikipedia 
3. Lab 

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Saturday, 22 September 2012

woody plant

A woody plant is a plant that uses wood as its structural tissue.Woody plants are supported by woody tissue that is hard, giving strength to plants and enable the plants to grow upright.







To see more : http://kohscience.blogspot.com/p/chapter-8.html



websites references 
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Classifying (support system-animals)

SUPPORT SYSTEM OF ANIMALS




How to identify & classify the animals' support system?

1.  Is this land or aquatic animal? 
     If land --------- go to question 2
     If aquatic ------go to question 3
2. Is it internal skeleton, hard covering  or soft-bodied?

3. If it is aquatic, it is supported by buoyancy of water.
    BUT , is it vertebrate or invertebrate?

    If it is vertebrate, then it is aquatic vertebrate animal with            endoskeleton, and supported by buoyancy of water.

     If it is invertebrate, 
     is it hard covering or soft-bodied?
    If it is hard covering then it is aquatic invertebrate animal with     exoskeleton, and supported by buoyancy of water.
   If it is soft-bodied then it is aquatic invertebrate animal with     hydrostatic skeleton, and supported by buoyancy of water


Example 1:

Image source: http://cikgufarahasnida.blogspot.com/

1.  Is this land or aquatic animal? it is land animal.
2. Is it internal skeleton, hard covering  or soft-bodied?
     Internal skeleton, so it is endoskeleton.



Example 2:
Image source: http://twistedsifter.sifter.netdna-cdn.com/
wp-content/uploads/2009/06/humpback-whale-under-water.jpg

1.  Is this land or aquatic animal?  it is aquatic animal.
3. If it is aquatic, it is supported by buoyancy of water.
    BUT , is it vertebrate or invertebrate?
    YES,  it is vertebrate, then it is aquatic vertebrate animal with            endoskeleton, and supported by buoyancy of water.


YOU GET IT?


TRY THESE:
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Friday, 21 September 2012

Buoyancy of water


Buoyancy of water

Buoyancy of water means the upthrust of water providing support for the weight of the body.

Although aquatic vertebrates animals such as whale, shark and dolphin have endoskeleton , their pectoral and pelvic girdle is very small and weak. Therefore their weight of the body are supported by buoyancy of water.

In the same case , aquatic invertebrates animals have either exoskeleton or  hydrostatic skeleton,  their weight of the body are supported by buoyancy of water.


1. aquatic vertebrates (endoskeleton)

2.  aquatic vertebrates ( Hydrostatic Skeleton 


3.  aquatic vertebrates ( Exoskeleton 


To see more : http://kohscience.blogspot.com/p/chapter-8.html








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Thursday, 20 September 2012

Hydrostatic Skeleton


Hydrostatic Skeleton or Fluid-filled Skeleton

A hydrostatic skeleton consists of a fluid filled cavity surrounded by a muscular structure in soft-bodied invertebrates.


1. Invertebrates without an exoskeleton, such as earthworm, leeches, slugs and jellyfish have a hydrostatic or fluid-filled skeleton.
2. A hydrostatic skeleton consists of liquids under pressure contained in certain compartment of the body.
3. The high pressure in the liquid acts on the inner walls of the animals body to support its body and to maintain its shape.
4.The hydrostatic skeleton has the following functions
          a.      provides support
          b.      maintains body shape
          c.       aids movement


To see more : http://kohscience.blogspot.com/p/chapter-8.html
Welcome to give me other examples. Can you?

Exoskeleton


Exoskeleton or External Skeleton

An exoskeleton is a hard covering that supports and protects the bodies of some types of animals. 
An exoskeleton is the external skeleton that supports and protects an animal's body

1. Most invertebrates, such as insects, crabs, lobsters and snail, have a hard covering on the outside of their body.
2. The hard covering is the external skeleton or exoskeleton.
3. The exoskeleton has the following functions
            a.         maintaining their shape
            b.         supporting their bodies
            c.         protecting their organs
            d.         aiding movement



Welcome to give me other examples. Can you?


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Endoskeleton


Endoskeleton or Internal Skeleton
An endoskeleton is a internal structure that holds an animal from inside. It is an internal supporting skeleton.
1. All vertebrates have an internal skeleton inside the body.
2. The internal skeleton is the endoskeleton.
3. Most vertebrates (mammals, birds, reptiles, amphibians and fish) have an endoskeleton.
4. However, some fish such as sharks and rays, have an endoskeleton made of cartilage (cartilage is a strong flexible material that is also in our nose and ears).
5. Endoskeletons are made of bone and cartilage.
6. Function of Endoskeleton
  • Support body weight
  • Maintain body shape
  • Protects soft tissues and organs of body
  • aids movement



Welcome to give me other examples. Can you?




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Monday, 17 September 2012

I'm happy You're here


As a starting of exploration, there's a suggestion to you :
Support System

If you don't mind, leave message or your name (if you are one of my student) in the comment column below.


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