What is true about the cell wall?
A cell wall is a structural layer surrounding some types of cells, just outside the cell membrane. It can be tough, flexible, and sometimes rigid. It provides the cell with both structural support and protection, and also acts as a filtering mechanism.
What is true about plant cells?
The cells of plants are eukaryotic. A eukaryotic cell is any cell with a ‘true’ nucleus and organelles. The presence of organelles called chloroplasts, vacuoles and a cell wall are three key features of the cells of plants. Plant cells are relatively large and can differ considerably within a plant.
What is the role of cell wall in plant cell?
The cell wall surrounds the plasma membrane of plant cells and provides tensile strength and protection against mechanical and osmotic stress. It also allows cells to develop turgor pressure, which is the pressure of the cell contents against the cell wall.
Which of the following is true for cell wall of higher plants?
The plant cell wall contains a complex sugar cellulose which is a structural carbohydrate that gives protection and supports the plant. The primary cell wall is composed of cellulose, hemicellulose and pectin. Pectin is also found in middle lamella which helps the binding of cells. So, the correct answer is option B.
How many type of plastid are there?
What are Coloured plastids called?
Chromoplasts: The chromoplasts are the colored plastids. Chloroplasts are responsible for the characteristic color of flower and fruit. They contain yellow, orange and or red pigments.
What is plastid and its function?
Plastids are double-membrane organelles which are found in the cells of plants and algae. Plastids are responsible for manufacturing and storing of food. These often contain pigments that are used in photosynthesis and different types of pigments that can change the colour of the cell.
How are plastids classified?
The plastids are broadly classified into two main types namely chromoplasts and leucoplasts. Chromoplasts also divided into three types based on their color namely chloroplast, phaeoplast and rhodoplast. Chloroplast: It is in green color. It contains chlorophyll pigments.
What cells are plastids found in?
The plastid (Greek: πλαστός; plastós: formed, molded – plural plastids) is a membrane-bound organelle found in the cells of plants, algae, and some other eukaryotic organisms.
What is the main function of Leucoplasts?
Leucoplasts (Fig. 1.9C) are a group of plastids that include many differentiated colorless organelles with very different functions (e.g., the amyloplasts), which act as a store for starch in non-green tissues such as roots, tubers, or seeds (Chapter 9).