Uncategorized

Seed Dispersion And Seed dispersal methods

Seed Dispersal

Seed dispersal and fruit dispersal both of them refers to the carrying of these particular structures to places away from the plants producing them to other wider regions. Plants have adopted this dispersal mechanism because they are fixed to the ground therefore they had to develop a mechanism for distribution of their seeds and fruits. What Does Dispersion Mean? Basically, ...

Read More »

Self Pollination And Its Types

Self Pollination - Types of Self Pollination

Self Pollination Self pollination is defined as the transfer of mature pollen grains from the anther of flower to stigma of same flower or to that of another flower of the same plant. So, this whole process is termed as Self pollination or Autogamy (auto – self, Gamos – marriage). For example in Pea, Cotton or “Tomato. Self pollination takes place in ...

Read More »

The Chromosomal Inversion and Its Types

Chromosomal Inversion

Chromosomal inversion is also called by different names (genetic inversion, chromosome inversion or inversion mutation). The Inversions are chromosomal mutations that conclude a segment of a chromosome that is turned around 180o and is reinserted into the chromosome. It does not involve a loss of genetic information but simply rearranges the linear gene sequence. An inversion involves two breaks along ...

Read More »

Biology Terms and Definitions

Terms of Biology Ecology: Study of organisms in relation to environment is called ecology. Physiology: Study of functions of different parts of body is called physiology. Histology: Study of tissues with the help of microscope is called histology. Genetics: Study of hereditary characters and their inheritance is called genetics. Zoogeography: Study of geographical distribution of animals on earth is called ...

Read More »

Important Point of The Chapter bacteria And Viruses

ADDITIONAL RELATED READINGS Taxonomy is the branch of biology which deals with the naming and classification of individuals. The arrangement of organisms into systematic groups is called as classification. More than 1.5 million species of animals and more than 0.5 million species of plants are known. All organisms are related to one another at some point in their evolutionary histories. ...

Read More »

Classification of virus Notes

CLASSIFICATION OF VIRUSES Different types of plant, animal and bacterial viruses are classified on the basis of morphology, cover and nucleic acid properties. Genetic Material: The genetic material may be DNA or RNA Cover: The genetic material may be naked, enveloped or complex. Morphology: On the basis of morphology viruses are classified into rod shaped (T.M.V), spherical (poliovirus), tadpole like ...

Read More »

LIFE CYCLE OF BACTERIOPHAGES ( LYTIC AND LYSOGENIC CYCLE)

The bacteriophage replicates only inside the bacterial cell. There are many steps in replication. Attachment (Adsorption) of Phage to the Host Cell: First of all the bacteriophage attaches to the bacterial cell at receptor site. The receptor sites are present on the cell wall of bacterium. During attachment, week chemical union occurs between virion and the receptor site. Penetration: In ...

Read More »

Diseases Caused by Viruses

DISEASES CAUSED BY VIRUSES Small Pox: Virus: It is caused by poxviruses. This virus is DNAenveloped. History: This disease occurred as epidemic in China in 12th century B.C. Until the early 20th century, it was common. Symptoms / Effects: This disease results in the formation of raisedfluid-filledvesicles on the body. These become pustules later on and form pitted scars, the ...

Read More »

Structure and Shape of bacteriophage

These have two shapes (structural forms): Cubical: These are regular solid or icosahedral (having 20 triangular faces). Helical Symmetry: They are rod shaped. Many phages consist of head and tail. The heads are polyhedral but tails are rod shaped. STRUCTURE OF BACTERIOPHAGE Bacteriophage meaning bacteria eater. Earlier workers studied few phages that infect Escherichia coli. Of these the best phages ...

Read More »
Distributed by name369.com