Tag: introduction to tissues

A tissue is the group of cells of the common origin which are structurally similar and perform a particular function. Whereas organ is the group of tissues and organ system is the group of organs which performs different functions. The molecule is the smallest part of the cell and different molecule performs different functions.

A tissue is the group of cells of the common origin which are structurally similar and perform a particular function. Whereas organ is the group of tissues and organ system is the group of organs which performs different functions.

1. Histology is known as the study of the microscopic structure of tissue or the branch of biology deals with the study of tissues.
2. Morphology is the branch of biology that deals with the external structure of the plant like root, shoot, leaves etc.
3. Taxonomy is the branch of biology that deals with the nomenclature of the organism.
4. Phyllotaxy is the pattern of arrangement of leaves on the stem or branch.

• The meristematic tissues are the dividing tissues but when they lose the ability to divide they become permanent tissues. This process of taking up a permanent shape, size and function are called cellular differentiation. 
• There are 3 types of permanent tissues: simple permanent tissues, complex permanent tissues, special or secretory tissues. So option B is correct.

A tooth consists of enamel, dentin, cementum and pulp tissue. The portion of a tooth exposed to the oral cavity is known as the dental crown, and the portion below the dental crown is known as the tooth root. Thus, the correct answer is option D.

A cellular organization between a single cell and a complete organism is controlled by the tissue. They are the collection of similar cells, with specific function. A collection of tissue gives rise to an organ. A tissue is a simple, which may be single celled type or a complex cell type. Proteins and enzymes are not the organization of cells. So, option B is correct.

The study of tissues is called as histology and the method to diagnose the disease is called as pathology so the combination of these two is histopathology where the tissue is examined microscopically to diagnose the manifestation of the diseases. So, option B is correct.

At the root apex, there are three principal tissues that originate from the three groups of histogens such as root vascular cylinder, cortex and epidermis 
Thus, the correct answer is option C.

In terrestrial plants, the endodermis is the central, innermost layer of cortex, made up of compact living cells surrounded by an outer ring of endodermal cells. It is the boundary between the cortex and the stele and contains the passage cells which allows some symplastic flow to the inside. Thus, the correct answer is option B.

1. Ecology is the branch of biology that deals with the relation of organism to one another and its surrounding
2. Cytology is the branch of biology that deals with the structure of a cell.
3. Histology is the branch of biology that deals with the study of microscopic anatomy or tissue.
4. Anatomy is the branch of biology deals with the internal structure of an organism.