Question:

Algmic acid is present in the cell wall of

Updated On: Jun 23, 2023
  • bacillariophyceae
  • myxophyceae
  • xanthophyceae
  • Laminaria
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The Correct Option is D

Solution and Explanation

The cell wall of brown algae is bilayered. The inner layer consists of cellulose, glucose and xylose as subunits. The outer layer is gelatinous and is composed of pectic substances. Certain colloidal substances like algin (alginic acid) and fucoidin is also present in certain algae like Laminaria, Sargassum etc. which help in water absorption. Alginic acid can stop bleeding and thus used as gauze in internal operation. It is also used as gelling agent in confectionary, dental creams etc.
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Notes on Kingdom Plant

Concepts Used:

Plant Kingdom

The Plant Kingdom comprises all the plants that have some shared characteristics. These are bacteria (prokaryotes), photosynthetic plants, fungi, and several non-photosynthetic plants.

Read Also: Two Kingdom Classification

Several features of Kingdom Plantae are as follows:

  • They are stationary. They are static and usually remain in one place only.
  • They have branches that expanded and green leaves due to the presence of chlorophyll.
  • They are an autotrophic mode of nutrition that simply means they prepare their food with the help of water, sunlight and carbon dioxide. It is further known as self-nutrition.
  • They indulge in photosynthesis during the day and therefore more carbon dioxide is needed during the day and at night it is released.
  • They secure their food in the form of starch-like algae.
  • They have an inelastic wall around their cell known as a cell wall comprised of cellulose.
  • There is an absence of the nervous system and excretory system.
  • Reproduction is entirely dependent on air, insects and water. Asexual and vegetative method of reproduction is noticed or detected.
  • The non-photosynthetic plants acquire their food through parasitism, i.e through their host like Indian pipe.

Read More: Classification of Plants