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By Indumati Rao;C.N.R. Rao

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The seed contains a plant embryo surrounded by a protective coat. Under suitable conditions of water, light and heat, new plants are born. Seeds and plant mobility Seeds help the immobile plants to move to new places. The evolution of seeds was the most significant development in the evolution of plants. Seeds have helped the plants to dominate the earth’s surface. How do seeds get around? Some seeds get around on their own as they have ‘wings’ and plumes. Dispersal of seeds - summing up Seeds are dispersed in many ways.

And help in the formation of humus. 24 Learning Science Deadly bacteria : Bacteria and diseases Bacteria are responsible for a number of diseases that cripple and kill humans and animals. Some of the diseases caused by bacteria are: typhoid, cholera, plague, tetanus, whooping cough, tuberculosis, leprosy and caries. Vaccines have been developed to prevent these diseases. Bacteria also cause plant diseases. Dental caries - the bacterial disease Dental caries affects almost everyone. This disease starts in the film on our teeth (or dental plaque).

Plants in spite of their diversity, have the same architecture. Plants grow at the tips throughout their life. All parts of plants have an outer covering. All plants transport water and nutrients upwards from the roots. All plants conduct food produced in the leaves to the other parts. Plants universally add colour and variety to life on earth. A plant certainly has a definite life span but it never becomes an adult in the sense an animal or a human being does. Most plants keep growing by adding new cells and tissues and new organs at the root tips and shoot tips.

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Learning science : Part 4 : Biology and life by Indumati Rao;C.N.R. Rao


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