The tissue is the group of cells from the common origin and performs a specific function and its detailed study is called as histology. Dermatology is the branch of medicine concerned with the diagnosis and treatment of skin disorders. Cardiology is the branch of medicine that deals with diseases and abnormalities of the heart. Cytology is the branches of biology and medicine concerned with the structure and function of plant and animal cells. Thus, the correct answer is option A.

The study of tissue is known as histology or, in connection with disease, histopathology. The tissues are studied by the use of paraffin block in which tissue is embedded and then sectioned, the histological stain and then observed under the microscope. Therefore, the correct answer is option D.

According to histogen theory by Hanstein, the three principal tissues of the root, vascular cylinder, cortex and epidermis originate from three groups of initial cells or histogens, in the apical meristem plerome, periblem and dermatogen respectively. A fourth histogen, the calyptrogen produces the root cap. 
Thus, the correct answer is option D.

In biology, tissue is a cellular organizational level between cells and a complete organ. A tissue is an ensemble of similar cells and their extracellular matrix from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues. So, the correct option is "D" (Cells which are similar in origin, form, and function).

In multicellular organisms, most of the tissue of the body is growing by increasing their cell number (means of cell division), but their growth is strictly regulated to maintain a balance between different tissue. Thus, the correct option is A.

Tissues which are made up of more than one type of cells and they work together as a unit are termed as complex tissues; it includes xylem and phloem. Bryophytes are a group of simple and primitive plants that show alteration of generation between two distinct phases namely a haploid gametophytic and a diploid sporophytic phase. The gametophyte is the haploid plant body which is either thalloid or a leafy shoot with stem-like and leaf-like structures and thread-like rhizoids. It lacks vascular tissues xylem and phloem. Zygote represents the first cell of the sporophytic phase which divides and develops into sporogonium. Sporogonium is differentiated into a foot, a seta and a capsule and serve to produce spores. Thus, all bryophytes lack complex tissues.
All gametophytes are the simple haploid stage that develops from spore and lacks vascular tissues, thus no complex tissues. Pteridophytes are the first vascular plants and possess vascular tissues xylem and phloem. The main plant body is sporophyte which is differentiated into true root, stem and leaves having a well differentiated vascular tissue.
The spermatophytes are the seed plants and include gymnosperms and angiosperms both of which have well developed vascular tissues (xylem and phloem).
Thus, the correct answer is option C.

• A group of cells of similar origin that are structurally similar and perform a particular function are called tissue e.g., nervous tissues, blood, etc.

• A tissue is the group of cells of the common origin that are structurally similar or sometimes dissimilar and perform a particular function. 
• Only plant cells are characterized by the distinct cell wall and absent in animal cells.

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.

1. Cytology is the branch of biology that deals with the structure of a cell.
2. Histology is the branch of biology that deals with the study of microscopic anatomy or tissue.
3. Morphology is the study of structure discernible with a naked eye.

Extracellular matrix is the network of macromolecules like collagen, enzymes etc, which provide structural support to the cells. They help in the formation of tissues and organs. Extracellular matrix functions as cell adhesive as they are helpful in the interaction between cells and matrix.

• Hairs and nails are made of dead tissues. Only the base of the hair and the base of the nail are living. 
• The dead tissues are devoid of the nerve supply which acts as messengers to convey the sensation of pain and in their absence, it cannot be perceived by our brain. 
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• Thus, the correct answer is option A.