The organelle that is present only in plant cell is a . Mitochondria b. Vacoule c.cell wall d. Nucleus
Answers
Answer:
A. Chloroplasts are the green coloured plastids which are involved in photosynthesis. The chloroplast is double membrane bound structure consisting of an outer and inner membrane separated by intermembrane space.
B. Cell wall is the outermost, rigid, protective, non-living and supporting layer found in plant cells, bacteria, cyanobacteria and some protists but absent in animal cells.
C. In animal cells, just outside the nucleus, an area called centrosome is present. It contains the organelles called as centrioles. These are the structures associated with spindle formation during cell division.
D. Large central vacuole is present only in plant cells. About 90% of plant cells is occupied by a single membrane bound vacuole. It stores macromolecules including ions, sugars, amino acids, proteins and carbohydrates.
E. Mitochondrion is known as power house of the cell because these are associated with cellular respiration and energy generation of the cell. Mitochondrion is present only in eukaryotes (i.e. present in plant cell also).
Hence Centrioles are not present in a plant cell. So, the correct answer is 'Centrioles'.
Explanation:
Answer:
Correct option is C).cell wall
Explanation:
A cell wall is structural layer surrounding some types of cells, just outside cell membrane. It can be tough, flexible, and sometimes rigid. It provides cell with both structural support and protection, and also acts as the filtering mechanism. Cell walls are absent in the animals but are present in most other eukaryotes including algae, fungi and plants and in most of prokaryotes (except mollicute bacteria). A major function is act as pressure vessels, preventing over-expansion of cell when water enters.
The composition of cell walls varies between taxonomic group and species and may depend on cell type of developmental stage. The primary cell wall of the land plants is composed of the polysaccharides cellulose, hemicelluloses and pectin. Often, other polymers such as the lignin, suberin or cutin are anchored to or embedded in plant cell walls. Algae possess cell walls made of glycoproteins and the polysaccharides such as carrageenan and agar that are absent from land plants. In bacteria, the cell wall is the composed of peptidoglycan. The cell walls of archaea also have various compositions, and may be formed of glycoprotein S-layers, pseudopeptidoglycan, or polysaccharides. Fungi possess the cell walls made of the N-acetylglucosamine polymer chitin. Unusually, diatoms have the cell wall composed of biogenic silica.
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