It's us Though we're small in numbers but we have big powers! List of people Bio assignment due on 27JAN Name of people who had completed will be bold. Allie ; April ; Crystal ; Denise ; Indira ; Saranya ; Sheryl ; Jesslyn ; Siauxin ; Yunji ; Huiming ; Ruelia ; Peizhen ; Dingheng ; Weesiang ; Zhengguang ; Weixhan ; Weikai ; Issac ; Fengye P/S: Click on your name, your post will appear. |
PICTURE PICTURE Linkage Allie Crystal Sheryl Jesslyn Huiming Lau Wee Siang What happened?
January 2010 February 2010 Thanks Blogskins.com LSX |
} Is the shed tail of a lizard considered a living thing?
Tuesday, January 26, 2010 @ 8:58 PM ![]() ![]() Sometimes, it is difficult to determine which organism is classified under living or non living things. The criteria for an organism to be classified as a living thing is base on the eight characteristic which is ,Movement,Excretion ,Respiration,Irritability ,Growth,Reproduction,Adaptability ,Nutrition. Living things have most or all of the eight criteria. Does the lizard tail has a mind of its own when it's being shed off? The shed tail moves complexly, so is it considered as a living thing? My aim is to conclude whether the lizard tail is a living thing or not. Shedding its tail is a common anti-predator defense among lizards. When attacked, many lizards drops the wriggling tail and escapes. The predator often feasts on the tail while the lizard runs to safety. Movement- The shed tails of the lizard wiggles. The movements of the shed tail is because of the far end of the tail, in a part of the spinal cord,at which it wiggles continuously. Respiration- The shed tail does not convert nutrients into useful energy in a cell. Neither does it exchange carbon dioxide for fresher air. Growth- The shed tail does not grow anymore as it is detached from the lizard. However, the lizard would grow a new tail afterwards. It will no longer grow either because Nutrition- The shed tail no longer needs nutrients or no longer can obtain nutrients. Excretion- The shed tail does not produce its own waste. Therefore I concluded that the lizard tale is NOT a living thing~! Reference. http://www.sciencedaily.com/releases/2009/03/090325170604.htm Done by, Crystal Chua :D |