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Groups
The vertical column in the periodic table is called as group. There are 18 groups in the long form of the periodic table and they are numbered from 1 to 18 in the IUPAC system. In the old system of naming they are numbered as I to VIII with A and B groups. This convention is fo..
Acetic Acid
Acetic Acid - IUPAC Name: Ethanoic acid Formula: CH 3 COOH Acetic acid is one of the commonest organic acids and has been known for quite a long time in the form of vinegar. It is also present free in a number of fruit juices. In the combined state it occurs in many oils and ess..
Drosera or Sundew
Herb with 6 - 12 leaves which are radical and form rosette. They have long petioles. Lamina is spoon shaped with tentacles which have swollen reddish tip. The tip is glandular and secretes a sticky purple juice which shines in the sun like dew drops. Hence the name sundew. When ..
Flowering Hormone
There is increasing evidence to suggest that a flowering hormone exists in plants. This is has been supported by a number of grafting experiments. A short day plant kept in long day conditions can be induced to flower, if a properly photo induced plant is grafted on it. It clearly i..
Earth Watch
United Nations has recently taken up an exciting new programme named "earth watch". It will provide monitoring, research, evaluation, control and exchange of information about the world environment. Inspite of many laws biodiversity is not conserved and wild life is suffering loss. The in..
Control of Ozone Depletion
Control of Ozone Depletion - Policy decisions are already taken in India to undertake technology developments for alternatives to CFCs. Two CSIR laboratories - National chemical laboratory and Indian Institute of Chemical technology are working on this. Along with this, parameters for design modifi..
Ethanoic Acid
Some Important Carbon Compounds - Ethanoic Acid - Acetic acid is one of the commonest organic acids and has been known for quite a long time in the form of vinegar. It is also present free in a number of fruit juices. In the combined state it occurs in many oils and essential oils. Formul..
Environmental Pollution
>It can lead to illness or even death in case of humans and animals. The growth of some plants can be retarded and this may cause them severe injury. It results in corrosion of metals, building materials and marble. Some pollutants distribute themselves over long distances in short period..
Neo-darwinism
It is the modern theory on organic evolution. It is a synthesis of the ideas from the theory of natural selection and the mutation theory. The theory is the outcome of the thinking of recent biologists such as Huxley, Haldane and Dobzhansky. Neo-darwinism is based on three principles namely..
Characteristic Features
Habit: Usually annual or perennial herbs. Root: Taproot system. Stem: Herbaceous, erect, branched. Leaves: Simple, alternate, radical or cauline, usually entire, sometimes lobed, petiolate, exstipulate reticulate venation. Inflorescence: Raceme or corymbose raceme. Flower: Ebractea..
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