Free Biodiversity and Variety of Life MCQs with Answers

• A. 100
• B. 150
• C. 200
• D. 250

Explanation: 200 species of bacteria are pathogenic, i.e can cause disease like cholera and tuberculosis in humans.

• A. Spores
• B. Cysts
• C. Granules
• D. All of these options are correct

Explanation: Option A is correct since spores are considerably more resistant to moist and dry heat than non-sporulating bacteria.

• A. Sexual reproduction
• B. Binary fission
• C. Mitosis
• D. Conjugation

Explanation: Conjugative or sex pili are special projections originating from many bacteria's cytoplasmic membranes.

• A. Cilia
• B. Flagella
• C. Pili
• D. Cytoplasm

Explanation: Pili are hollow, nonhelical, filamentous appendages. They are primarily involved in a mating process between cells called conjugation.

• A. Soft drinks
• B. Mango squash
• C. Milk
• D. Orange Juice

Explanation: Milk: This option is the correct answer. Milk is widely pasteurized to kill harmful bacteria and increase its shelf life.

• A. Photoautotrophic bacteria
• B. Chemosynthetic bacteria
• C. Saprotrophic bacteria
• D. Parasitic bacteria

Explanation: Cyanobacteria synthesize their own food from inorganic substances and this fall into the category of photoautotrophs.

• A. Diplococcus
• B. Sarcina
• C. Streptococcus
• D. Staphylococcus

Explanation: Option A is incorrect because Division in one plane that form a pair of coocci is called diplococcus.Option B is correct since Division in…

• A. Water
• B. Heat
• C. Milk products
• D. Vaccines

Explanation: Pasteurization is a technique to remove pathogenic organisms in certain foods and liquids.

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

Explanation: There are four types of flagellar arrangements based on the number and placement of flagella on the cell. These are, 1.

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

Explanation: In bacteria,genetic recombination takes place. Genetic recombination is primitive type of sexual reproduction.

• A. Chemosynthetic
• B. Photosynthetic
• C. Parasitic
• D. Pathogenic

Explanation: The nitrifying bacteria of the soil are Nitrosomonas and Nitrobacter. They are called chemoautotrophs (chemosynthetic would be a general…

• A. Disinfectants
• B. Chemotherapeutics
• C. Vaccines
• D. Antiseptics

Explanation: Antiseptics are used to inhibit the growth of bacteria.

• A. Cysts
• B. Spores
• C. Cell wall
• D. Capsules

Explanation: Endospores (spores withing the vegetative cells) are tough dormant structures that form inside the cell wall of certain types of bacteria…

• A. Glycolipids
• B. Glycoproteins
• C. Lipoproteins
• D. Peptidoglycan

Explanation: Bacterial cell walls are made of peptidoglycan, also called as murein, which is made from polysaccharide chains cross-linked by unusual…

• A. Flagella
• B. Pilli
• C. Cilia
• D. Microtubules

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

• A. Archaeobacteria
• B. Eubacteria
• C. Mycoplasma
• D. Cyanobateria

Explanation: Mycoplasmas are a group of bacteria that are characterized by their lack of a cell wall, which makes them unique among bacteria.

• A. Oxidation of proteins
• B. Coagulation of proteins
• C. Degeneration of nucleic acids
• D. Bursting up of cells

Explanation: Moist heat can cause the coagulation or denaturation of proteins. When proteins are exposed to high temperatures, their three-dimensional…

• A. 0.5-1.5
• B. 2.0-4.0
• C. 1.1-1.6
• D. 2.0-6.0

Explanation: The diameter of E. coli falls within the range of 1.1 to 1.5 micrometers. E.

• A. Antisepsis
• B. Disinfection
• C. Disinfestation
• D. Chemotherapy

Explanation: Antisepsis refers to the process of killing or inhibiting the growth of microorganisms, particularly bacteria, on living surfaces such as…

• A. Lipids
• B. Peptidoglycan
• C. Teichoic acid
• D. Lipoteichoic acid

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