grade 9 biology bacteria

Besides crop production good crop management involves storage of grains before distribution. During storage grains and seeds are subjected to spoilage by various agencies. Biotic - Insects, rodents, birds, fungi, mites, bacteria Abiotic - Moisture and temperature The loss due to spoilage ..

Insects Diseases Rice 10% 15% Wheat 5% 15% Jowar 12% 18% Bajra 5% 8% Cowpea 3% 15% green gram 2% 14% Black gram 2% 11% Soyabean 3% 9% Pesticides, in general, make a class of chemicals used to control pests, which include insects, fungi..

Summary - 1) Non-invasive diagnostic techniques are those that can be applied without penetrating the skin. 2) X-rays have a remarkable ability to penetrate matter. They help to provide detailed images of dense parts of the body like bones. 3) The photographic image produced by x-radiation is calle..

Climatic Factors - Temperature - Temperature is one of the essential and changeable environmental factors. It penetrates into every region of the biosphere and profoundly influences all forms of life by increasing or decreasing some of the vital activities of the organism. It is frequently a limiti..

Bacteria are minute microscopic prokaryotes. They are unicellular organisms, which are usually identified by their specific activities, more than their general organisati..

show a primitive type of sexual reproduction called genetic recombination. Conjugating Bacteria In this process, the exchange of genetic materials takes place by a process called conjugation . Conjugating bacterial cells are in contact through a hollow tube called pilus. In the hig..

These are bacteria which live in a mutually beneficial association with other organisms. Such bacteria derive the essential nutrients from their host organisms and in that process help the host through some of their biological activities. 1. The most familiar example o..

Bacteria exhibit different modes of nutrition. On this basis, broadly two types of bacteria can be recognised autotrophic bacteria and heterotrophic bacteria..

These are bacteria which manufacture organic compounds from inorganic raw materials utilising energy liberated from the oxidation of inorganic substances. Following are the common types of chemo autotrophic bacteria. 1. Nitrifying bacteria which derive energy by oxidi..

Binary Fission - It is the most common mode of asexual reproduction. The cytoplasm and nucleoid of a bacterial cell divide equally into two, following replication of DNA. The cell wall and cytoplasm also split resulting in the formation of two daughter cells. Under favourable conditions, a bacteria..