Welcome to 2011 Yr 10 students! Let’s start with mitosis and meiosis.

Posted July 28, 2011 by Russell
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Link through the resources on Symbaloo to start learning about mitosis and meiosis.

Thanks and goodbye to the class of 2010.

Posted December 2, 2010 by Russell
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Thank you to all those students, teacher and parents who contributed to the LSC Year 10 Biol Class Blog. We learnt many things about biology, about blogging and about ourselves.

I’m sure many will go on to use blogs in future studies, work or on a personal basis. In the mean time we can all look forward to the 2011 LSC blogs which promise to be bigger and better than ever!

Evidence for Evolution

Posted November 16, 2010 by Russell
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How do plants and animals change their environment

Posted November 12, 2010 by ree0015
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Aim: to see the changes animals and plants make on their environments

Hypothesis: Tube A will be red in colour, Tube B will be purple in colour, tube C will be red in colour, tube D will be red in colour, tube E will be yellow in colour, tube F will be yellow in colour, Tube G will be yellow in colour and tube H will be red in colour

Materials: 8 test tubes, animals ( brine shrimp ), pond weed, 8 stoppers, hydrogen carbonate indicator, 2 test tube racks and water suitable for marine life.

Procedures: Fill test tubes with water, add enough hydro carbonate solution to tinge the colour to red (be careful here to not use too much). Add plants and animals into the test tubes, labelling them ABCDEFGH. Leave A B C D in light for 12 hours and E F G H in dark for 12 hours.

Results: My predictions were correct; the tubes which had photosynthesis happening where purple in colour besides tube C which would be red in colour to balance out the animals producing carbon dioxide. The tubes without light where all yellow in colour. This is because there was excess carbon dioxide without photosynthesis occurring.

Discussion:

  1. 1. Which tubes show a reduced level of carbon dioxide and how has this change occurred?

Tube B shows a reduced level of carbon dioxide because of the plants using the carbon dioxide in the photosynthesis process causing more oxygen to be in the miniature environment.

  1. 2. Which tubes show an increased level of carbon dioxide and how has this change occurred?

Tubes B, E, F and G have a increased level of carbon dioxide because they had no photosynthesis occurring. Tube B only contained brine shrimp so they produced carbon dioxide therefore reducing their oxygen in the environment. Tube E had the same environment as B only in the dark so the results where the same. Tube F produced more carbon dioxide because the plant could not use photosynthesis because there was no light so it produced carbon dioxide.

Tube G had animals and plants in the dark and it had an increased level of carbon dioxide because there was no photosynthesis so they both produced carbon dioxide increasing the level.

  1. 3. What do you think would happen to the tubes from the dark if you put them in the light?

If the tubes from the dark where put into the light now they would mirror the results of ABCD after a period of time where photo synthesis can occur again.

  1. In the dark and in the light animals produce carbon dioxide through the process of respiration. In the light plants use up more carbon dioxide for Respiration than they produce by Photosynthesis. In a community of plants and animals, the plants can also use up all of the carbon dioxide made by the respiring animals when it is produced. In the dark, plants cannot carry out photosynthesis, so at night Carbon dioxide level in an ecosystem might rise.
  1. 5. People are worried about global climate change. Some scientists think it is partly caused by an increased level of carbon dioxide in the atmosphere. Some people think that we can offset our carbon footprint by planting more trees. How would this work?

By planting more trees the air is being recycled the carbon dioxide unfit for us to breathe is being turned back into oxygen, it is not too late to offset the carbon footprint we are creating at the moment by choosing my eco friendly options and planting more trees and limiting deforestation.

Conclusion: From the experiment we can see the effects animals and plants have on our environments. In places with a balanced number of plants and animals creates the perfect environment for both plants and animals.   We can also see what happens when the levels are imbalanced or photosynthesis cannot occur causing a environment with more carbon dioxide.

How do plants and animals change the environment around them?

Posted November 11, 2010 by Russell
Categories: Uncategorized

A link to the Practical Biology website for accessing this activity is here!

In plants and animals respiration occurs at all times.

In plants photosynthesis occurs in light.

Why children never leave home!

Posted October 7, 2010 by ben0021
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Modern children are now having very long childhoods. Unlike Elephants they are not made to stand straight away and join the heard.

There is evidence though showing children having short childhoods, such as Australopitthecus and Homo erectus. They had a period of short childhoods that was more similar to a chimpanzees then living humans.

It’s unsure when children started to have long childhoods but teeth were found and analyses that belonged to a child living in North Afica 160,000 years ago. This showed that children were having longer childhoods. the groth patterns were similar to the groth  found among modern European children’s teeth.

“Early fossil humans tended to grow fast, have a shorter childhood and resemble chimpanzees in tearms of their developental profile.”

The oldest fossil found that suggested that there was somthing like living hummans rather then earlier humans or apes.

Amys Second Post- Humans ate the Neandathals

Posted October 7, 2010 by cam0010
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Some say that neanderthals were wiped out because of climate change. others say that our ancestors ate the neanderthals. Scientist Fernando Rozzi says neanderthals jaw bones had marks similar to those of Stone Age humans, found on other deers and animals. The neanderthals had to resort to cannabalism in their day, so scientists believe it is poossible they ate their own kind, breaking skulls for the extraction of marrow.