12 Questions
What is the role of the waxy, water-resistant layer secreted by the epidermal cells?
Protection against loss of water, mechanical injury, and invasion by parasitic fungi.
What are stomata and what is their function?
Stomata are small pores in the epidermis of the leaf, enclosed by two kidney-shaped guard cells. They are necessary for exchanging gases with the atmosphere and for transpiration.
What is the primary function of the epidermal cells of the roots?
Water absorption, aided by the long hairlike parts that greatly increase the total absorptive surface area.
Why do epidermal cells form a continuous layer without intercellular spaces?
Because they have a protective role to play and form a barrier against water loss, mechanical injury, and invasion by parasitic fungi.
What are the functions of blood in the body?
Carrying oxygen and food to all cells, collecting wastes from all parts of the body and carrying them to the liver and kidney for disposal.
What are the different types of animal tissues based on the functions they perform?
Epithelial tissue, connective tissue, muscular tissue, and nervous tissue.
Where can epithelial tissues be found in the animal body?
Epithelium covers most organs and cavities within the body, including the skin, lining of the mouth, lining of blood vessels, lung alveoli, and kidney tubules.
What is the role of the permeability of epithelial cells?
The permeability of the cells of various epithelia plays an important role in regulating the exchange of materials between the body and the external environment and also between different parts of the body.
What is the function of the waxy cutin coating on the epidermis of desert plants?
It provides waterproofing and prevents water loss.
What is the main difference between the outer layer of a branch of a tree and the outer layer of a young stem?
The outer layer of a branch contains cork cells, while the outer layer of a young stem contains primary meristem.
What are the main functions of tracheids and vessels in the xylem?
Transporting water and minerals vertically.
What are the main components of the phloem and their functions?
The main components are sieve cells, sieve tubes, companion cells, phloem fibres, and phloem parenchyma. The phloem transports food from leaves to other parts of the plant.
This quiz explores the role of the epidermis in plants, particularly in dry habitats where protection against water loss is crucial. It covers the structure and function of epidermal cells, guard cells, and the waxy layer that aids in water resistance.
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