Ch.8 - Cell Diversity Flashcards
What is a tissue?
A tissue is a group of similar cells that are modified to carry out the same functions.
What is dermal tissue?
Dermal tissue is normally a single layer of cells that surrounds the different parts of a plant.
What is epidermis?
Epidermis is a type of dermal tissue. Epidermis cells have a slightly thickened wall. They may also have a cuticle (a waterproof layer) on its outer surface. They are found as a covering on leaves, stems and roots.
What is the function of dermal tissue?
The function of dermal tissue is to protect the plant.
What is the difference between a simple and complex tissue?
Simple tissue has only one cell type. Complex tissue has multiple cell types.
What is vascular tissue?
Vascular tissue transports materials around a plant. It consists of two different types of cells: xylem and phloem.
What is xylem? What is its function?
Xylem consists of hollow tubes with openings called pits that run throughout the plant. Xylem transports liquids such as water and it provides support for the plant.
What is phloem? What is its function?
Phloem is a series of tube-like structures found in the leaves, stems and roots of a plant. The function of phloem is to transport food from the leaves to the rest of the plant.
What is connective tissue? What does it do, provide examples.
Connective tissue joins and supports other cells and tissues. Adipose tissue(fat storage), cartilage, bone and blood. It’s adapted to its role as it consists of a number of cells spread out in a matrix produced by connective cells.
What is nervous tissue?
Nervous tissue is composed of nerve cells called neurons. Neurons are adapted to carry electrical impulses to and from the brain and spinal cord. A mylein sheath insulates the nerves, hastening transmission.
What is tissue culture?
Tissue culture is the growth of cells in or on a sterile nutrient medium outside an organism.
Define micropropagation.
Micropropagation is the growth of large numbers of plants from very small plant pieces (tissues or cells). It can be used in cancer research and skin grafts.
What are the advantages of micropropogation?
A large number of plants are produced in a short time.
It is an inexpensive way to grow a large number of similar plants.
The plants grown in this way are genetically identical.
What are antibodies?
Antibodies are proteins that are produced in response to a specific antigen.
What is an organ?
An organ is a structure composed of a number of tissues that work together to carry out one or more functions.
