You will love this biology test format, do quiz, check your answers instantly. set 007

Biology questions set 007

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animal tissue organ and organ system

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ANIMAL TISSUE, ORGAN AND ORGAN SYSTEM There is only one cell in the body of the animals of the phylum Protozoa. Animals of the Phylum Porifera are simplest multi-cellular animals. Their cells do not form actual tissue. Though tissues, organs and systems are not formed in members of the phylum Cnidaria (previously known as Coelenterata), their body cells are, however, arranged in two layers. In the animals from phylum Platyhelminthes to Chordata, tissues, organs and organ systems are seen. Members of those phyla are three layered. From there three embryonic cell layers (namely ectoderm, mesoderm and endoderm), tissues, organs and systems are formed. Tissue : In the body of multi-cellular animals some cells remain together and performa particular function. These cells are either formed from the ectoderm, mesoderm or endoderm of the embryo and remain close together. Inter-cellular materials or matrix are present between these cells. These cells may be similar or of different types. Arisin...
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Division Of Labour In Multicellular Plants

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Division Of Labour In Multicellular Plants : Tissue and Tissue System Tissue : In unicellular organisms a single cell does all the functions. There is no chance of division of labour on the basis of cell. In contrast, this kind of division is found in multicellular living body. In this case, it is observed that a group of cells performs the duty of manufacturing food; another group stores it, while the other group conducts the transport of food materials. There is further a group of cells that gives mechanical strenght to some organs. In many cases it is observed that a group of cells originating from a single origin remain closely attached in a place and collectively perform a similar type of function. This type of cells in a group is called tissue. In multicellular organisms division of labour is the main cause of formation of tissue. Types of Tissue : Cells of all tissues do not have the power of cell division but some of them have. Therefore tissues are of two types in terms of t...
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Biology: Have you been told anything about virus ? find out

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Biology note A detailed insight on virus  A virus is a biological agent that reproduces inside the cells of living hosts. When infected by a virus, a host cell is forced to produce thousands of identical copies of the original virus an extraordinary rate .  There are various types of viruses in the world, As a representative of viruses, T2 Phage is itroduced here with its importance.  Test your self with these biology questions  biology question set 005 biology question set 004   Structure of virus: T2 Phage is a cellular. Its body is divided into two parts- head and tail; the head is a hexagonal and the tail is rod shaped, a protein shell surrounds the body. Inside the shell there is a' double-strand DNA in its head. At the upper end of the tail there is a collar, and at the lower end there is a base plate, some spikes and attachment fibres. In Viruses there is no nucleus, cell membrane, cytoplasm and other organelles. Multiplication of virus Viruses can mult...
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