Kingdom Monera — NEET Biology MCQs with Solutions
Free NEET Biology Kingdom Monera MCQs with step-by-step solutions (9 questions). Part of Biological Classification. Practise online on Prepizo — no login needed.
▶ Practise Kingdom Monera online (free)
Questions with solutions
Q1 — Kingdom Monera · easy · theory
Bacteria are grouped under Kingdom Monera because they are:
A. Prokaryotic ✓ Correct
B. Multicellular
C. Eukaryotic
D. Photosynthetic only
Solution: Monera comprises prokaryotes — organisms lacking a true membrane-bound nucleus and organelles.
Q2 — Kingdom Monera · easy · theory
On the basis of shape, a comma-shaped bacterium is called a:
A. Coccus
B. Bacillus
C. Vibrium (vibrio) ✓ Correct
D. Spirillum
Solution: Shapes: coccus (spherical), bacillus (rod), vibrium (comma), spirillum (spiral).
Q3 — Kingdom Monera · easy · theory
Archaebacteria differ from other bacteria mainly in the structure of their:
A. Cell membrane (branched-chain lipids) ✓ Correct
B. Nucleus
C. Ribosomes only
D. Mitochondria
Solution: Archaebacteria have a distinctive cell-wall structure and branched-chain lipids in the membrane, allowing survival in extreme habitats.
Q4 — Kingdom Monera · medium · theory
Methanogens, which produce methane (biogas) in the guts of ruminants, are:
A. Cyanobacteria
B. Mycoplasma
C. Archaebacteria ✓ Correct
D. Eubacteria (heterotrophic)
Solution: Methanogens are archaebacteria found in marshy areas and ruminant guts; they generate methane from CO₂/H₂.
Q5 — Kingdom Monera · medium · theory
Cyanobacteria (blue-green algae) fix atmospheric nitrogen in specialised cells called:
A. Basal cells
B. Hormogonia
C. Akinetes
D. Heterocysts ✓ Correct
Solution: Heterocysts are thick-walled, anaerobic cells (e.g. in Nostoc, Anabaena) that carry out nitrogen fixation.
Q6 — Kingdom Monera · medium · theory
Which group of Monera lacks a cell wall entirely and can survive without oxygen?
A. Actinomycetes
B. Chemosynthetic autotrophs
C. Cyanobacteria
D. Mycoplasma ✓ Correct
Solution: Mycoplasma are the smallest living cells, completely lack a cell wall, and many are anaerobic; some are pathogenic.
Q7 — Kingdom Monera · hard · theory
Chemosynthetic autotrophic bacteria obtain energy by oxidising inorganic substances such as nitrates, nitrites and ammonia. Their ecological importance is that they:
A. Perform oxygenic photosynthesis
B. Recycle nutrients (e.g. nitrogen, sulphur, iron) ✓ Correct
C. Fix carbon using sunlight
D. Cause food spoilage only
Solution: They derive energy from inorganic oxidation and play key roles in the recycling of N, S, P, Fe etc.
Q8 — Kingdom Monera · hard · theory
The mode of nutrition in the majority of Eubacteria is:
A. Photoautotrophic
B. Always parasitic
C. Heterotrophic (mostly decomposers) ✓ Correct
D. Chemoautotrophic
Solution: Most eubacteria are heterotrophs — important decomposers; some are autotrophic (photo- or chemosynthetic).
Q9 — Kingdom Monera · hard · theory
Which feature is shared by BOTH archaebacteria and eubacteria?
A. 80S ribosomes
B. Histone-wrapped chromosomes identical to eukaryotes
C. 70S ribosomes and a single circular DNA ✓ Correct
D. Membrane-bound nucleus
Solution: Both are prokaryotes with 70S ribosomes and a naked circular chromosome; archaea differ in wall/membrane chemistry and some molecular features.