Question

What is the reason for the success of Monerans?
A. Eukaryotic nature and rigid cell wall
B. Absence of nucleus and other membrane bound organelles
C. Absence of vacuole and microscopic in nature
D. Rapid rate of cell division and metabolic diversity

Answer 1

Hint: Monerans reproduce asexually by amitosis. They show all types of autotrophic, heterotrophic or saprophytic nutrition. They also can live in extreme environments like deserts, snow, hot springs, and deep seas, in which very few other types of life can exist.

Complete Answer:
- R.H. Whittaker suggested a classification of the Five Kingdom in 1969. Monera, Protista, Fungi, Plantae and Animalia are the kingdoms described by him. He uses the cell structure, organisation, the mode of feeding, reproduction and psychological relations to identify them as primary criteria.
- Kingdom Monera alone is made up of bacteria. These microorganisms are most abundant. Nearly everywhere bacteria occur. In a handful of soils, hundreds of bacteria exist. They also live in extreme environments like hot springs, deserts, snow and deep seas, in which very few other types of life can exist. Many organisms exist as parasites in or on other organisms.
- A large range of bacteria are present in Monera. In extremely hot and saline environments these will thrive, as compared to other species found in deep seas, extremely cold temperatures etc. They display all types of autotrophic, heterotrophic or saprophytic nutrition. They undergo a rapid cell division by amitosis, an asexual reproduction form in favourable conditions. They are unicellular.

Thus, the correct answer is option D. i.e., Rapid rate of cell division and metabolic diversity.

Note: The Monera kingdom is a vast group of species made up of all the prokaryotic (non-nucleated) species. Monerans are small, ubiquitous, single-cell organisms that colonized the Earth's corners. They are the most popular species in the world by far, based on simple numbers.