All Free Biology MCQs with Answers

• A. Physalia
• B. Euplactella
• C. Sponges
• D. Jellyfish
• E. Taenia

Explanation: Explanation for this question will be added soon.

• A. Pseudocoelom
• B. Coelom
• C. Acoelom
• D. Enteron

Explanation: [A] Roundworms have pseudocoelom and is covered with tough cuticles between the endoderm and mesoderm.[B] Coelom: principal body cavity…

• A. Jellyfish
• B. Sea anemone
• C. Tapeworm
• D. Corals
• E. Sponge

Explanation: Explanation for this question will be added soon.

• A. Protozoans
• B. Eumetazoa
• C. Protoctist ancestors
• D. Nematodes

Explanation: Aschelminthes are commonly called roundworms as are nematodes.

• A. Allen
• B. Thorpe
• C. Schjeldeup ebbe
• D. Carpenter

Explanation: The social organization of howling monkeys has been studied by several researchers.

• A. Disinfestations
• B. Antisepsis
• C. Infections
• D. Infestations

Explanation: FACT Diseases in living organisms that are caused by parasites are called infestations.

• A. Reptiles
• B. Mammals
• C. Both reptiles and mammals
• D. Birds and mammals

Explanation: Option A: Reptiles generally do not have three bones in the ear. Instead, reptiles typically have a single bone in their middle ear called…

• A. Few centimeter wide to more than one meter tall.
• B. Few decimeter wide to more than one meter tall.
• C. One meter wide to more than millimeter tall.
• D. Few millimeter wide to more than one meter tall.

Explanation: Most Porifera are only a few centimeters in size, but some urn-shaped or shapeless ones are less than a centimeter (0.4 inches); others…

• A. Annelida
• B. Mollusca
• C. Plathyelminthes
• D. Coelenterata

Explanation: The' arthropod nervous system' consists of a dorsal brain and a ventral, ganglionated longitudinal nerve cord (primitively paired) from…

• A. Porifera
• B. Parazoa
• C. Coelomates
• D. Protozoa

Explanation: Parazoa refers to the class of organisms in the kingdom Animalia which lacks tissue grade of organization.

• A. Reptiles
• B. Mammals
• C. Both reptiles and mammals
• D. Birds and mammals

Explanation: Modern mammals are unique among vertebrates for possessing three tiny bones in the middle ear.

• A. Nuerons are differentiated into sensory, motor and associative neurons.
• B. Nerves are present.
• C. No specialized sensory organs are present.
• D. All of the above.

Explanation: 1. Planaria is a flatworm and belongs to the phylum Platyhelminthes. 2.

• A. They may be coelomate pseudocoelomate or acoelomate
• B. They are included in grade bilateria
• C. All of them have a digestive system
• D. All of them have blood vascular system

Explanation: Correct option is D. Option D is not a feature of triploblastic animals.

• A. Fungus
• B. Smut
• C. Bacterium
• D. Yeast

Explanation: Corn smut is a plant disease caused by the pathogenic fungus Ustilago maydis.

• A. Filicinae
• B. Angiospermae
• C. Gymnospermae
• D. All of these options

Explanation: Refer to FTB, Ferns belong to the group Pteropsida, subgroup or class filicinae which are the most abundant group of seedless vascular…

• A. Cocci
• B. Bacilli
• C. Spirilla
• D. None of these

Explanation: Spirilla bacteria are also termed curve screw shaped.

• A. Polysaccharides
• B. Cellulose
• C. Amino Acids
• D. Proteins

Explanation: A bacteria consists of glycocalyx- the outermost covering of a bacteria, that exists in two forms i.e., capsule and slime.

• A. Mesosomes
• B. Zygospores
• C. Endospores
• D. Cysts

Explanation: Endospores are dormant bodies that are capable of surviving for longer periods and are resistant to higher temperatures and UV radiations.

• A. Gram positive bacteria
• B. Gram negative bacteria
• C. Both Gram positive & negative
• D. None of these

Explanation: In Gram-negative bacteria, periplasmic space - the space between the peptidoglycan layer of the cell wall and cell membrane which is the…

• A. Polysaccharides
• B. Proteins
• C. Peptidoglycan
• D. Cholesterol

Explanation: Bacterial cell walls are primarily composed of peptidoglycan, which is a unique macromolecule consisting of both sugars (polysaccharides)…