
The most primitive of monerans are
A) Rickettsiae
B) Actinomycetes
C) Progenote
D) Archaebacteria
Answer
525k+ views
Hint: The most ancient group of organisms on the earth is monera. This kingdom includes mycoplasma,bacteria, actinomycetes and cyanobacteria. Monera is the only prokaryotic kingdom .These organisms are single celled and have no true nucleus. Monerans are the most numerous of all living organisms on the earth.
Complete Answer:
>Option a is Rickettsiae which is a gram negative ,non spore forming and nonmotile bacteria. It is belongs to rickettsiaceae family.hence option a is wrong
>Option b is actinomycetes which are unicellular gram positive bacteria.Members of this group are found in different habitats across the world.They can produce different kinds of spores. So option b is also wrong.
>Option c is progenote. It was the last common ancestor of archaebacteria and eukaryotic.It is also called the last universal common ancestor. So option c is also wrong
>Option d is given to archaebacteria. They are the oldest living form on the earth.They belong to kingdom monera.So option d is correct.
Additional information:
Characters of archaebacteria
->Cell membrane of archaebacteria is made of lipids.
->The cell wall of archaebacteria is rigid which provides it shape and support.
->Its nutritional requirement is fulfilled by thick cytoplasm.
->They do not possess membrane bound organelles.
->Archaebacteria can live in a variety of environments so they are called extremophiles.
->They can withstand a very high pressure of more than 200 atmospheres.
Note:Archaebacteria able to do photosynthesis. They can reproduce asexually. They show a high level of horizontal gene transfer between lineage.They do not produce spores like other bacteria. They can live in extreme environments.
Complete Answer:
>Option a is Rickettsiae which is a gram negative ,non spore forming and nonmotile bacteria. It is belongs to rickettsiaceae family.hence option a is wrong
>Option b is actinomycetes which are unicellular gram positive bacteria.Members of this group are found in different habitats across the world.They can produce different kinds of spores. So option b is also wrong.
>Option c is progenote. It was the last common ancestor of archaebacteria and eukaryotic.It is also called the last universal common ancestor. So option c is also wrong
>Option d is given to archaebacteria. They are the oldest living form on the earth.They belong to kingdom monera.So option d is correct.
Additional information:
Characters of archaebacteria
->Cell membrane of archaebacteria is made of lipids.
->The cell wall of archaebacteria is rigid which provides it shape and support.
->Its nutritional requirement is fulfilled by thick cytoplasm.
->They do not possess membrane bound organelles.
->Archaebacteria can live in a variety of environments so they are called extremophiles.
->They can withstand a very high pressure of more than 200 atmospheres.
Note:Archaebacteria able to do photosynthesis. They can reproduce asexually. They show a high level of horizontal gene transfer between lineage.They do not produce spores like other bacteria. They can live in extreme environments.
Latest Vedantu courses for you
Grade 11 Science PCM | CBSE | SCHOOL | English
CBSE (2025-26)
School Full course for CBSE students
₹41,848 per year
Recently Updated Pages
Nagaland NEET Counselling 2025: Dates, Process, Eligibility & Seats

MP NEET UG Counselling 2025: Step-by-Step Guide & Dates

Master Maths Concepts & Formulas | Fast Learning Guide

Master Division of Mixed Fractions Easily | Maths Guide

Master Physics: Key Concepts, Branches & Real-World Uses

Horsepower in Physics: Definition, Types & Real-World Uses

Trending doubts
1 ton equals to A 100 kg B 1000 kg C 10 kg D 10000 class 11 physics CBSE

Difference Between Prokaryotic Cells and Eukaryotic Cells

One Metric ton is equal to kg A 10000 B 1000 C 100 class 11 physics CBSE

1 Quintal is equal to a 110 kg b 10 kg c 100kg d 1000 class 11 physics CBSE

Proton was discovered by A Thomson B Rutherford C Chadwick class 11 chemistry CBSE

Draw a diagram of nephron and explain its structur class 11 biology CBSE
