In prokaryotes, chromatophores are
Specialised granules responsible for the colouration of cells
Structures responsible for organising the shape of the organism
Inclusion bodies lying free inside the cells for carrying out various metabolic activities
Internal membrane systems that may become extensive and complex in photosynthetic bacteria
Who for the first time developed electron microscope?
Knoll and Ruska
Rudolf and Kolliker
Robert Hooke
Swanson
The mineral present in cell wall is
Na
Ca
K
Mg
B.
Ca
The main components of cell wall are:-
1. Matrix- It consists of water (60%), hemicellulose (5-15%), pectic substances (2-8%), lipids (0.5- 3.0%) and proteins (1-2%).
2. Microfibrils- Cellulose or fungus cellulose (10-15%).
3. Other ingredients- Lignin, cutin, suberin, silica, minerals (Fe, Ca, Carbonate), waxes, tannins etc.
Calcium (Ca2+) ions are used as cations to balance anions in the plant vacuole. It helps in maintaining the chemical balance in the soil that reduces soil salinity and improves water penetration.