03/12/2011

Science Year Two Topics Part 1

 
1.) - Living Things & Non-Living Things
 
 
 
                                                          Living Things : - 

                                    
 

 
 
 
 
                                     Non-Living Things : -

 

Ecosystems vary in size. They can be as small as a puddle or as large as the Earth itself. Any group of living and nonliving things interacting with each other can be considered as an ecosystem.
HANDS ONInvestigate an Ecosystem
Open the door and step into your ecosystem. Go outside and investigate the closest ecosystem.

Within each ecosystem, there are habitats which may also vary in size. A habitat is the place where a population lives. A population is a group of living organisms of the same kind living in the same place at the same time. All of the populations interact and form a community. The community of living things interacts with the non-living world around it to form the ecosystem. The habitat must supply the needs of organisms, such as food, water, temperature, oxygen, and minerals. If the population's needs are not met, it will move to a better habitat. Two different populations can not occupy the same niche at the same time, however. So the processes of competition, predation, cooperation, and symbiosis occur.
Like a beehive

Habitats, then, are specific to a population. Each population has its own habitat. For example, a population of ants has its own habitat.
HANDS ONAnt Farming
Observe an ant farm and make comparisons to other populations.

Several populations may share a habitat. For example, in a small pond several aquatic populations may co-exist in the same water at the same time. An aquarium is a good example of a shared habitat.
HANDS ONMake an Aquarium
Make your own aquatic ecosystem and observe the interaction between living and non-living things.

A terrarium is another place where several populations will peacefully co-exist in the same habitat. Vivaria are habitats where several plant and animal populations live together. Within any shared habitat, behavior influences the survival of a species. Behavior can be instinctual or learned.

Biomes are ecosystems where several habitats intersect. The Earth itself is one large biome. Smaller biomes include desert, tundra, grasslands, and rainforest.
Like the desert
Biomes occur naturally, but people can also create controlled biomes. For example, you can integrate several small populations in a small space and observe what happens. A famous manmade biome is Biosphere 2. Try making your own biome and observing what happens.

The energy cycle within biomes, habitats, and ecosystems determines which populations survive and which die. All living things need energy. Ultimately, the sun is the source of all energy in an ecosystem. Different species have different functions: producers, consumers, decomposers, and scavengers.
HANDS ONThe Energy Cycle
How does energy flow within an ecosystem? Use energy from decaying food samples to grow mold.
Habitats must also supply water for all living things to survive. Their needs are met through the water cycle.
 
Since energy and water are vital to the survival of an ecosystem, a system of conservation is needed. In many ecosystems, the conservation of resources is a natural, almost unnoticeable process. Life substances, for example, are recycled in the ecosystem. The exhange of carbon dioxide (given off by animals) and oxygen (given off by plants) is actually a process of conservation. The waste of one species becomes food for another. When resources become limited, the conservation process becomes more urgent and more visible with an increased need for recycling.
 
If conservation efforts fail, species become endangered and extinction can occur. A species becomes endangered when there is not enough habitat available to support all members of the population. When the habitat vanishes, and all members of the population die, then the species is considered extinct. 
 
Groping living things and non-living things
Characteristics of living things:
a)       * it needs water and food
b)      * it breathes
c)       * it can move
d)      * it grows
e)      * it can produce young
    
Humans, animals and plants are living things.
 
 
( source from :  http://www.fi.edu/tfi/units/life/habitat/habitat.html )



Check More Youtube Links about Living Things & Non-Living Things (Sains Year 2 KBSR) :- 
1.) http://www.youtube.com/watch?v=VYefRAipuTw
2.) http://www.youtube.com/watch?v=1wM1wTZXibg
3.) http://www.youtube.com/watch?v=k3b2VCNzhZo
4.) http://www.youtube.com/watch?v=3RcB2f50PVY
5.) http://www.youtube.com/watch?v=j-8kETESH10&feature=related
6.) http://www.youtube.com/watch?v=2uHJ_OtVil0&feature=related
7.) http://www.youtube.com/watch?v=40JRDqrmq0k&feature=related
 
 
 
 
                                                                  2.) Ourselves
 
                                                       
 
 
Human animals are maybe the only ones who get to define themselves. How we do that often explains how we see all of life. Truthfully, books or movies or whatever else we might bring into our lives including friends, it is how we define ourselves that probably most impacts our choices and all of how we live. We can define ourselves tightly or loosely. We can change the definitions as we age or fight to keep them constant. We can find definitions that can grow with us and are about more than the superficial. We can not define ourselves at all and let others do it.

Our way of defining ourselves might impact not just how we see ourselves but also how others see us.  If our definitions are objective, we will be realistic in our goals. If we have let someone else define us, we might find it difficult to even figure out our own dreams.

Naturally after just having been to a reunion of many people the same age, a reunion that took me back fifty years and more; then watching a documentary on female artists and their lives, reading blogs where I hear people defining themselves many different ways, ways I might not define them if I was putting out my own definitions, this subject of defining has been on my mind as to how I would define me.

( source from :  http://www.fi.edu/tfi/units/life/habitat/habitat.html )

Check More Youtube Links about Ourselves (Sains Year 2 KBSR) :-
1.) http://www.youtube.com/watch?v=it-TfigDVMM
2.) http://www.youtube.com/watch?v=z951-qBpemU


 
3.) Animals
 
Animals are a major group of multicellular, eukaryotic organisms of the kingdom Animalia or Metazoa. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their life. Most animals are motile, meaning they can move spontaneously and independently. All animals are also heterotrophs, meaning they must ingest other organisms or their products for sustenance.
Most known animal phyla appeared in the fossil record as marine species during the Cambrian explosion, about 542 million years ago.




The word "animal" comes from the Latin word animalis, meaning "having breath".In everyday colloquial usage, the word sometimes refers to non-human animals. Sometimes, only closer relatives of humans such as mammals and other vertebrates are meant in colloquial use. The biological definition of the word refers to all members of the kingdom Animalia, encompassing creatures as diverse as sponges, jellyfish, insects and humans
 

( source from :  http://www.wikipedia.com )

Check More Youtube Links about Animals (Sains Year 2 KBSR) :-
1.) http://www.youtube.com/watch?v=s9MvP9blCwc&feature=related
2.) http://www.youtube.com/watch?v=lc-BbVkBMlA&feature=related
3.) http://www.youtube.com/watch?v=FUAdNwsAvsw&feature=related
4.) http://www.youtube.com/watch?v=2xa041qwuWE&feature=relmfu


4.) Plants

Plants are living organisms belonging to the kingdom Plantae. Precise definitions of the kingdom vary, but as the term is used here, plants include familiar organisms such as trees, flowers, herbs, bushes, grasses, vines, ferns, mosses, and green algae. The group is also called green plants or Viridiplantae in Latin. They obtain most of their energy from sunlight via photosynthesis using chlorophyll contained in chloroplasts, which gives them their green color. Some plants are parasitic and may not produce normal amounts chlorophyll or photosynthesize.




Precise numbers are difficult to determine, but as of 2010, there are thought to be 300–315 thousand species of plants, of which the great majority, some 260–290 thousand, are seed plants .
The scientific study of plants is known as botany.

 
 
( source from :  http://www.wikipedia.com )

Check More Youtube Links about Plants (Sains Year 2 KBSR) :-
1.) http://www.youtube.com/watch?v=CXbhdBzx1Ag&feature=related
2.) http://www.youtube.com/watch?v=LxaELwrTChs&feature=related
3.) http://www.youtube.com/watch?v=CX2m2n2uDAE&feature=relmfu
4.) http://www.youtube.com/watch?v=sXrnHff2Kjc&feature=related
 
 
5.)  Long & Short
 
Typically, equity long/short investing is based on "bottom up" fundamental analysis of the individual companies, in which investments are made. There may also be "top down" analysis of the risks and opportunities offered by industries, sectors, countries, and the macroeconomic situation.
Long/short covers a wide variety of strategies. There are generalists, and managers who focus on certain industries and sectors or certain regions. Managers may specialize in a category — for example, large cap or small cap, value or growth. There are many trading styles, with frequent or dynamic traders and some longer-term investors.

A fund manager typically attempts to reduce volatility by either diversifying or hedging positions across individual regions, industries, sectors and market capitalization bands and hedging against un-diversifiable risk such as market risk. In addition to being required of the portfolio as a whole, neutrality may in addition be required for individual regions, industries, sectors, and market capitalization bands.


 




There is wide variation in the degree to which managers prioritize seeking high returns, which may involve concentrated and leveraged portfolios, and seeking low volatility, which involves more diversification and hedging.
 
Check More Youtube Links about Long & Shorts (Sains Year 2 KBSR) :-
1.) http://www.youtube.com/watch?v=ZzCJqVAlNr4
2.) http://www.youtube.com/watch?v=BJxbXz9y0ew&feature=related
3.) http://www.youtube.com/watch?v=lNuDqFPIZOM&feature=related

 

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