Question:

The function of nitrogen fixation in Anabaena (cyanobacterium) is performed by

Updated On: Jul 27, 2022

thylakoid
heterocyst
phycocyanin
phycoerythrin

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The Correct Option is B

Solution and Explanation

Heterocyst is a specialized cell found in nitrogen-fixing cyanobacteria. These are enlarged cells with thick cell walls and they lack chlorophyll, giving them a colourless appearance. They are the site of nitrogen fixation for which they produce the enzyme nitrogenase. They lack photosynthetic activity (which would produce oxygen), together with the thick cell wall are thought to maintain the anoxic conditions in heterocysts that are essential for the activity of nitrogenase. Heterocysts are connected by plasmodesmata to surrounding cells, on which they depend for nutrients.

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Concepts Used:

Kingdom Monera

Characteristics of Monera Kingdom

The organisms in this kingdom have the following characteristics: -

Monerans are single-celled creatures.
The cell wall is made up of peptidoglycan and is stiff.
Binary fission is asexual reproduction.
They have 70S ribosomes in them.
The locomotory organ is the flagella.
Organelles such as mitochondria, lys
osomes, plastids, Golgi bodies, endoplasmic reticulum, centrosome, and others are not present.
These are decomposers and mineralizers for the environment