Saturday, July 30, 2011
Living fossil in evolution - the Lancelet!
The first animal was taught about to me in the first class of my first Science College I studied. I was not able to get a clear idea about it in the lecture. Earlier I had been taught only about fish, frog and rabbit in Pre-University Course. This animal was a different one - it was neither like a worm or a fish! It is the Amphioxus (Bronchiostoma lanceolatum, Lancelet). It is a primitive animal from which vertebrate animals developed by evolution. It is fish-like and of 2 inches length. It has a transparent body without fins. But has no eyes.
Saturday, July 16, 2011
A bird hunting on birds - Shikra!
One day at forenoon I heard a bird's call, "tit titee..tit titee." I was curious to locate its source and went on searching for the bird. But I could not. Suddenly I heard the cry of other common birds of the locality accompanied by their helter-skelter flying away. This is to avoid the attacking by a bird of prey. It had perched on the nearby tree - unseen: I saw it fly after a prey from my side! It is the Shikra (Accipiter badius dussumieri, 'Vairee' in Tamil).
Saturday, July 2, 2011
Adapting with this animal - the Sloth!
In boyhood days I wondered how the Slender Loris lives with its slow movements. Later on, I viewed an animal that was more sluggish than Slender Loris and is having different and unusual body unlike that of other mammals. Luckily it lives on the tree tops escaping its predators like jaguar and eagles. I refer here only to this animal: Sloth (Bradypus variegatus, Brown-throated Three-toed Sloth).
Labels:
Animals,
Science,
Sloth,
Symbiotic bacteria
Friday, June 10, 2011
Playing bright and dark on the sky!
Before 1960s, it was then a routine for the family members of the house to sit on the veranda or steps of the house at dusk and engage in gossips. Elders go on narrating about deeds and stories to the kids. In the midst of it they don't miss to point out at the bright stars shining on the sky. (My mom was then a guide to me apprising me about the 'Belt Stars' of the sky!). Messages about these wonders on the sky were passed on by mouths in such a way. At present also such wonders are shown to the public through daily news papers.
Labels:
Belt Stars,
Conjunction,
Earth,
Lunar Eclipse,
Moon,
Opposition,
Science,
Universe
Saturday, May 21, 2011
Insect rolling for welfare - Dung beetle!
On walking along the one foot path in rural areas, I often find black beetles moving hurriedly with a small ball of earth. They actually rolled back the ball with their hind legs placed on it; at the same time they also walked back with their fore legs on the ground! These beetles are the Dung beetles (Orthophagus gazella, Scarab beetle, 'Piee vurutti vandu' in Tamil). The ball is nothing but bits of faeces or dung of cattle rolled into a sphere!
Labels:
Dung beetle,
Insects,
Nature,
Scarab beetle,
Science
Thursday, May 5, 2011
Leaf-drinkers in water scarcity!
In school class room it was taught that transpiration is one of the plant's physiological functions. But do we know that 'reverse transpiration' is also a physiological function? Yes, it is so - in certain plants! In them leaf takes in water and sends it to the stem - reverse of what we learnt and expect - root takes in water and sends it to leaves via stem. These plants are described as 'Leaf - drinkers,' as their leaves are 'drinking' water.
Labels:
Atacama desert,
Desert Fir,
Leaf-drinkers,
Nature,
Pygmy Cedar,
Science,
Transpiration,
Tree
Thursday, April 21, 2011
Rolling back with Roll Films!
My childhood excitements were much as my sisters and brothers showed me all the wonders in this world. My eldest brother used to enter into darkened room whenever there was a family function. When I tried to peep into the room he shouted at me to close the door. Later he explained me after coming out of the room thus: he was loading his camera with a Roll film that would have been spoiled if it was done outdoors in daylight!
Friday, April 1, 2011
A Mini Liver for saving lives!
We live, and are alive as we have our body organ, the Liver. Liver does many functions for our body. In its own illnesses such as Cirrhosis and Hepatitis C, it functions lesser than normal. Here this it has to be replaced with a donor liver by transplantation. But lo, donors are not readily available.
Labels:
Cirrhosis,
Hepatitis C,
Medicine,
Mini Liver
Friday, March 25, 2011
Explicit mother care of Surinam Toad
I have seen tribal women carry their children on their back in pouches of cloth. I was reminded of this when I was informed about a different kind of frog (toad) that carries its young ones on its back! It is the Surinam toad (Pipa pipa, Star-fingered toad). It is also remarkable that it carries young ones from their embryo stage itself!
Labels:
Nature,
Pipa pipa,
Surinam toad,
Toad
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