A cell is a combination of different structures: Cell Organelle: Just like our bodies need different specialized types of organs and tissues to function properly, the cells also have specialized parts called organelles. Each of these performs a different function.

Histology, branch of biology concerned with the composition and structure of plant and animal tissues in relation to their specialized functions. The fundamental aim of histology is to determine how tissues are organized at all structural levels, from cells and intercellular substances to organs.

The Four Main Types of Cells

• Epithelial Cells. These cells are tightly attached to one another.
• Nerve Cells. These cells are specialized for communication.
• Muscle Cells. These cells are specialized for contraction.
• Connective Tissue Cells.

Histology is the science of the microscopic structure of cells, tissues and organs.

Histopathologists provide a diagnostic service for cancer; they handle the cells and tissues removed from suspicious ‘lumps and bumps’, identify the nature of the abnormality and, if malignant, provide information to the clinician about the type of cancer, its grade and, for some cancers, its responsiveness to certain …

There are 4 basic types of tissue: connective tissue, epithelial tissue, muscle tissue, and nervous tissue.

They differentiate into three main tissue types: dermal, vascular, and ground tissue. Each plant organ (roots, stems, leaves) contains all three tissue types: Dermal tissue covers and protects the plant, and controls gas exchange and water absorption (in roots).

Dermal tissue covers and protects the plant, and vascular tissue transports water, minerals, and sugars to different parts of the plant. Ground tissue serves as a site for photosynthesis, provides a supporting matrix for the vascular tissue, and helps to store water and sugars.

While epidermal tissue mediates most of the interactions between a plant and its environment, ground tissue conducts the basic functions of photosynthesis, food storage, and support.

Plant Tissues are categorized broadly into three tissue systems: the epidermis, ground tissue and the vascular tissue.

According to this criterion, plant diseases are classified into two types: infectious (biotic) diseases, which are caused by eukaryotes, prokaryotes, parasitic higher plants, viruses/viroids, nematodes, and protozoa, and noninfectious (abiotic) diseases, which are caused by different extreme environmental conditions [5 …