Free Biodiversity and Variety of Life MCQs with Answers

• A. Heterocyst
• B. Hormogonia
• C. Akinetes
• D. Mesosomes

Explanation: Nitrogen fixation occurs through heterocycts.

• A. Flagella
• B. Pili
• C. Capsule
• D. Slime

Explanation: Pilli are tubular extensions of cell membrane and project through the cell wall.They are composed of pillin protein.

• A. Gram positive bacteria
• B. Gram negative bacteria
• C. Both A and B
• D. None

Explanation: Periplasmic space is a region that exists between the inner and outer membranes in gram-negative bacteria.

• A. Cell wall
• B. Cell membrane
• C. Slime
• D. Capsule

Explanation: Just beneath the cell wall is the cell membrane or plasma membrane. It is very thin, lexible and completely surrounds the cytoplasm.

• A. Cell wall
• B. Slime
• C. Cell membrane
• D. Capsule

Explanation: Correct option is C cell membrane, The cell membrane, also known as the plasma membrane, is a semipermeable barrier that surrounds the…

• A. PSI
• B. PSII
• C. Both A and B
• D. None

Explanation: Correct Option C: This option is correct. Cyanobacteria are related to eukaryotes in having both PSI (Photosystem I) and PSII (Photosystem…

• A. Mitochondria
• B. Chloroplast
• C. Both A and B
• D. None of the above

Explanation: Option C is correct. Both mitochondria and chloroplasts are believed to be of prokaryotic origin, and their presence in eukaryotic cells…

• A. Antibodies
• B. Environmental stress
• C. Disinfectants
• D. All of these

Explanation: Option D is correct. Spores are resistant to antibodies, environmental stress, and many disinfectants, making them highly durable and…

• A. Gas vesicle
• B. Gliding motility
• C. Flagella
• D. Both A and B

Explanation: Option D is correct. Cyanobacteria can move by utilizing gas vesicles to control their buoyancy in the water column and by gliding…

• A. Photosynthetic bacteria
• B. Heterotrophic bacteria
• C. Saprotrophic bacteria
• D. Chemosynthetic bacteria

Explanation: Purple non-sulfur bacteria are photosynthetic bacteria that perform anoxygenic photosynthesis using organic compounds other than water as…

• A. Transduction
• B. Binary fission
• C. Conjugation
• D. Transformation

Explanation: Binary fission is the most similar type of bacterial replication to mitosis. It is the process by which bacteria reproduce asexually.

• A. Spirochete
• B. E. coli
• C. Pseudomonas
• D. Campylobacter

Explanation: Campylobacter is an example of a bacterial genus that requires low concentrations of oxygen, making them microaerophilic organisms.

• A. Saprophytic
• B. Anaerobic
• C. Aerobic
• D. Facultative

Explanation: Saprophytic bacteria are also known as saprotrophic bacteria. They are decomposers that obtain their energy and nutrients by breaking down…

• A. Ribosome
• B. Flagella
• C. Pili
• D. Cell wall

Explanation: Ribosomes are composed of RNA and proteins. Some may also be loosely attached to plasma membranes. They are protein factories.

• A. S
• B. O2
• C. CO2
• D. H

Explanation: Aerobic bacteria release CO2 in dead organic matter and if carbon present in dead matter is not release it would diminish all the CO2…

• A. Atrichous
• B. Amphitrichous
• C. Lophotrichous
• D. Peritrichous

Explanation: Atrichous means bacteria are without any flagella.

• A. Cyanobacteria
• B. Nostoc
• C. Chlorella
• D. E. coli

Explanation: "The explanation for this question will be added soon!".

• A. Pili
• B. Flagella
• C. Cell wall
• D. Outer membrane

Explanation: They are primarily involved in a mating process between cells called conjugation process.

• A. Phycobilisome
• B. Mesosomes
• C. Spores
• D. Cytoplasmic granule

Explanation: "The explanation for this question will be added soon!".

• A. Long chain of cells
• B. Types of division
• C. Shape
• D. All of above

Explanation: Based on planes of division, the coccus shape can appear in several distinct arrangements: diplococcus, streptococcus, tetrad, sarcina…