Free Biodiversity and Variety of Life MCQs with Answers
3,130 Biodiversity and Variety of Life MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Biological classification uses taxonomic ranks, binomial nomenclature and shared characteristics to organize life into kingdoms. The major groups include prokaryotes, protists, fungi, plants and animals, with comparisons based on cell type, cell wall, nutrition, body organization, reproduction and evolutionary relationships; prokaryotes lack a membrane-bound nucleus.
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- A. Enteric fever
- B. Skin cancer
- C. Goitre
- D. Hay fever
Explanation: Hay fever is an allergic reaction to the pollen of grasses, trees, and other plants.
Correct answer: Hay fever- A. Trichinella spiralis
- B. Salmonella typhimuium
- C. Yersinia pestis
- D. Leishmania donovani
Explanation: Plague is an acute epidemic disease of rats and other wild rodents caused by the bacterium Yersinia pestis.
Correct answer: Yersinia pestis- A. Inside the cytoplasm
- B. On nuclear membrane
- C. Inside the nucleus
- D. On cell surface
Explanation: An antigen is any foreign substance, such as a protein or polysaccharide, present on the external coating of a pathogen, a component of…
Correct answer: On cell surface84. A cell coded protein that is formed in response to infection, with most animal viruses, is called :
- A. Histone
- B. Antibody
- C. Interferon
- D. Antigen
Explanation: Interferons are proteins that enhance a cell's resistance to viral attacks by unmasking genes responsible for synthesizing antiviral…
Correct answer: Interferon- A. Syphilis : Treponema pallidum
- B. Gonorrhoea : Entamoeba histolytica
- C. Urethritis : Bacillus anthracis
- D. Softsore : Bacillus brevis
Explanation: Syphilis is caused by a spirochete (spiral bacterium) Treponema pallidum.
Correct answer: Syphilis : Treponema pallidum86. The main reason why antibodies could not solve all the problems of bacteria mediated disease was:
- A. Decreased efficiency of the immune system
- B. Insensitivity of the individual following prolonged exposure to antibiotics
- C. Development of mutant strains resistant to antibodies
- D. Inactivation of antibiotics by bacterial enzymes.
Explanation: Bacteria develop mutant strains that become resistant to antibodies, rendering these antibodies incapable of combating diseases mediated…
Correct answer: Development of mutant strains resistant to antibodies- A. Acidophils
- B. Monocytes
- C. Basophils
- D. Neutrophils
Explanation: Neutrophils are the most abundant type of white blood cells and are an integral part of the immune system.
Correct answer: Neutrophils- A. Form tissues
- B. Relieve pain
- C. Relieve fatigue
- D. Cause pain
Explanation: An analgesic is a substance that reduces pain without causing unconsciousness, either by lowering the pain threshold or by increasing pain…
Correct answer: Relieve pain- A. Anopheles - Malaria
- B. Leishmania - Sleeping sickness
- C. Glossina - Kala-azar
- D. Wuchereria - Filariasis
Explanation: Wuchereria bancrofti is a parasitic filarial nematode worm transmitted by a mosquito vector.
Correct answer: Wuchereria - Filariasis- A. Eubacteria
- B. Cyanobacteria
- C. Mycobacteria
- D. Archaebacteria
Explanation: Halophiles, a type of archaea, typically thrive in extreme saline environments such as salt pans, salt beds, and salt marshes.
Correct answer: Archaebacteria- A. DNA molecules without protein coat.
- B. RNA molecules with protein coat.
- C. RNA molecules without protein coat.
- D. DNA molecules with protein coat.
Explanation: RNA molecules without a protein coat: This is the correct description of viroids.
Correct answer: RNA molecules without protein coat.- A. Pseudomonas
- B. Mycoplasma
- C. Nostoc
- D. Bacillus
Explanation: Mycoplasma is the smallest living cells known without a definite cell wall, pathogenic to both plants and animals, and capable of…
Correct answer: Mycoplasma- A. Nuclear membrane
- B. Plasma membrane
- C. Glycocalyx
- D. Cell wall
Explanation: The component that provides the sticky character to the bacterial cell is the Glycocalyx. Here's an explanation of each option:1.
Correct answer: Glycocalyx- A. Eubacteria
- B. Archaebacteria
- C. Dinoflagellates
- D. Slime moulds
Explanation: Methanogens belong to the archaebacteria group. Here's an explanation for each of the options:1.
Correct answer: Archaebacteria- A. Methanogens
- B. Sulphate reducing bacteria
- C. Halophiles
- D. Thermoacidophiles
Explanation: Sure, I can explain each of these options:1. **Methanogens**: Methanogens are a type of archaea, which are primitive prokaryotic…
Correct answer: Methanogens- A. Eubacteria are also called false bacteria.
- B. Phycomycetes are also called algal fungi.
- C. Cyanobacteria are also called bluegreen algae.
- D. Golden algae are also called desmids.
Explanation: The statement "Eubacteria are also called false bacteria" is incorrect.
Correct answer: Eubacteria are also called false bacteria.- A. They cause infections.
- B. Their RNA is of high molecular weight.
- C. They lack a protein coat.
- D. They are smaller than viruses.
Explanation: RNA of viroid has low molecular weight. The statement "Their RNA is of high molecular weight" is wrong for viroids.Here are explanations…
Correct answer: Their RNA is of high molecular weight.- A. Cellulose
- B. Hemicellulose
- C. Chitin
- D. Peptidoglycan
Explanation: Certainly! The major component of the cell wall of most fungi is chitin. Here's an explanation of each of the options:1.
Correct answer: Chitin- A. Fungi
- B. Animalia
- C. Monera
- D. Protista
Explanation: Certainly, let me explain the classification of these microorganisms:1.
Correct answer: Protista- A. Phycomycetes
- B. Ascomycetes
- C. Deuteromycetes
- D. Basidiomycetes
Explanation: Imperfect fungi that are decomposers of litter and play a role in mineral cycling can belong to various fungal groups.
Correct answer: Deuteromycetes