- Which of the following groups includes nitrogen-fixing bacteria?
a) Protozoa
b) Archaea
c) Cyanobacteria
d) Fungi
Answer: c) Cyanobacteria
Explanation:
Cyanobacteria are photosynthetic prokaryotes that can fix atmospheric nitrogen, converting it into ammonia, which plants can use.
- Bacteria that have rod-shaped cells are called:
a) Cocci
b) Bacilli
c) Spirilla
d) Vibrios
Answer: b) Bacilli
Explanation:
Bacilli are rod-shaped bacteria, while cocci are spherical, spirilla are spiral-shaped, and vibrios are comma-shaped.
- Which of the following is a plant-like protist?
a) Amoeba
b) Euglena
c) Paramecium
d) Plasmodium
Answer: b) Euglena
Explanation:
Euglena is a plant-like protist that can perform photosynthesis using chloroplasts, although it can also switch to heterotrophic modes of nutrition.
- Which of the following is not a member of kingdom Plantae?
a) Spirogyra
b) Chlamydomonas
c) Volvox
d) Rhizopus
Answer: d) Rhizopus
Explanation:
Rhizopus is a fungus, while Spirogyra, Chlamydomonas, and Volvox are all algae belonging to the kingdom Plantae.
- Which of the following characteristics is unique to prokaryotes?
a) Presence of a true nucleus
b) Absence of organelles
c) 80S ribosomes
d) Membrane-bound organelles
Answer: b) Absence of organelles
Explanation:
Prokaryotes lack membrane-bound organelles like the nucleus, mitochondria, and Golgi bodies, which are found in eukaryotic cells.
- Which of the following belongs to the kingdom Monera?
a) Algae
b) Bacteria
c) Protozoa
d) Fungi
Answer: b) Bacteria
Explanation:
Bacteria are classified under the kingdom Monera, which includes all prokaryotic organisms.
- The presence of 70S ribosomes is a characteristic of:
a) Prokaryotes
b) Eukaryotes
c) Viruses
d) Fungi
Answer: a) Prokaryotes
Explanation:
Prokaryotic cells, like bacteria, contain 70S ribosomes, while eukaryotic cells have 80S ribosomes.
- Which of the following is a free-living nitrogen-fixing bacterium?
a) Rhizobium
b) Azotobacter
c) Nitrosomonas
d) Nitrobacter
Answer: b) Azotobacter
Explanation:
Azotobacter is a free-living nitrogen-fixing bacterium that converts atmospheric nitrogen into ammonia, which can be used by plants.
- Which of the following is a unicellular fungus?
a) Penicillium
b) Rhizopus
c) Saccharomyces
d) Agaricus
Answer: c) Saccharomyces
Explanation:
Saccharomyces, commonly known as yeast, is a unicellular fungus used in fermentation processes like baking and brewing.
- Which of the following is a photosynthetic bacterium?
a) Clostridium
b) Pseudomonas
c) Mycobacterium
d) Cyanobacteria
Answer: d) Cyanobacteria
Explanation:
Cyanobacteria, also known as blue-green algae, are photosynthetic bacteria that use sunlight to produce food, similar to plants.
Leave a comment