True nucleus is absent in
- Vaucheria
VoIvox
- Anabaena
- Mucor
The Correct Option is C
Approach Solution - 1
Anabaena is a prokaryotic organism. It is a cyanobacteria (blue green algae) which belongs to Kingdom Monera. Like all other prokaryotes, it lacks a true nucleus and other cell organelles.
Therefore, the correct option is (C): Anabaena.
Approach Solution -2
Explanation:
Vaucheria: Vaucheria is a freshwater green alga that belongs to the class Xanthophyceae. It has a filamentous body consisting of an outer cell wall, central vacuole, a protoplast containing nuclei, chromatophores, and other organelles.
Volvox: Volvox is a green alga that belongs to the family Volvocaceae under the kingdom Plantae. The cell has a nucleus, vacuoles, and an eyespot.
Anabaena: Anabaena is a prokaryotic organism. It is a cyanobacterium (nitrogen-fixing blue-green alga) and belongs to the Kingdom Monera. Like all other prokaryotes, it lacks a true nucleus and other cell organelles.
Mucor: Mucor is a fungus that belongs to the class Zygomycetes. Mucor is also known as bread mold, and it contains multinucleated nuclei along with other organelles.
So, all the organisms except Anabaena are eukaryotes, which possess a well-defined nucleus and other organelles. Therefore, the correct option is Anabaena.
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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
