SCIENCE
PLANT KINGDOM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Cellulosic wall covered with algin gelatinous coverings
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Pectose wall covered with algin coverings
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Cellulosic wall covered with algun gelatinous coverings
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Pectose wall covered with pectin gelatin coverings
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Detailed explanation-1: -Solution. The members of brown algae have gelatinous coating outside the, cellulosic cell wall called Algin, Alginic acid is a phycocolloid extracted commercially from giant brown algae or kelps, Alginic acid is copolymer of -a, 4 D –mammuronic acid -1, 4 –glucoronic acid.
Detailed explanation-2: -Brown algal cell walls are composed predominantly of the polyanionic polysaccharides alginates and fucose-containing sulfated polysaccharides. These polymers are prevalent over neutral and crystalline components, which are believed to be mostly, if not exclusively, cellulose.
Detailed explanation-3: -The vegetative cells have a cellulosic wall usually covered on the outside by a gelatinous coating of algin.
Detailed explanation-4: -Cell wall is covered by algin gelatinous substance in Phaeophyceae. Phaeophyceae or brown algae is a class under the Division Thallophyta. The members of brown algae are generally found in marine habitats. Their cell wall is composed of cellulose with an outer covering of a gelatinous substance called algin.
Detailed explanation-5: -Dictyota and Laminaria are examples of brown algae or phaeophyceae. They have cellulosic wall covered on the outside by a gelatinous coating of non sulphate hydrocolloids.