Sclerenchyma cells provide protective, vascular and supportive functions, according to the McGraw-Hill Higher Education. They have fibers and sclereids, which are responsible for the protective and supportive functions.Continue Reading
Vascular tissues of plants consist of phloem and xylem, says the McGraw-Hill Higher Education. Phloem cells blend in with parenchyma, while xylem cells stand out as sclerenchyma cell types. They are usually found next to each other in vascular tissues. Most sclerenchyma cells die at maturity and thus lack nuclei.
Mature sclerenchyma cells contain secondary cell walls that are thick with cellulose and typically impregnated with lignin, explains the University of the Western Cape. Sclerenchyma is elastic, with a very small cell cavity. The main function of sclerenchyma is supporting tissue in plants. Sclereids are responsible for the shells of walnuts and the hardness of date seeds. Their cells have an irregular shape, and their cell walls are thick and hard. The cell walls contain simple pits or canals, which link adjacent cells. Fibers help transport water in the plant and young; living fibers store starch granules. Fiber cells are characterized by a needle shape, pointed tips, small lumen and thick walls. Vascular tissue of flowering plants contain plenty of fibers, whereas sclereids are often found in fruits and seeds.Learn more about Cells
Cellular respiration is used to make ATP, adenosine triphosphate, which provides the energy that the cells need to be able to carry out their functions in living cells. All cells carry out some form of cellular respiration, either aerobic or anaerobic. The cells that perform aerobic respiration need oxygen to carry out the process, while cells that use the anaerobic process do not, instead relying on fermentation.Full Answer >
A centriole is a small cylindrical organelle in animal cells that employs materials to form centrosomes and cilia, the projections of the cells that are responsible for the body’s movement and sensory functions. During cell division, the centriole is specifically arranged to aid the processes of mitosis and meiosis. A centriole remains in close proximity with another to form a pair (centrosome).Full Answer >
Companion cells provide ATP and nutrients and carry out all of the cellular functions of a sieve-tube element in plants. The cytoplasm in sieve-tube elements lack most of the structures necessary for cellular maintenance.Full Answer >
Eukaryotic cells have organelles, membrane-bound structures that perform different functions in the cell, and prokaryotic cells do not. Some typical eukaryotic organelles include the nucleus, mitochondria, ribosomes, Golgi apparati and chloroplasts.Full Answer >