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Biology · Question 481
Modern classification of living organisms uses evidence from:
Genetics only
Cytology only
Homology, genetics and cytology
Homology only
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Correct answer: C
Homology, genetics and cytology
Modern taxonomy integrates structural, cellular and genetic evidence.
Biology · Question 482
Which taxonomic rank lies between class and family?
Genus
Species
Order
Phylum
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Correct answer: C
Order
The standard hierarchy is phylum, class, order, family, genus and species.
Biology · Question 483
A complete mature infectious virus particle is called a:
Virus colony
Prion
Capsid only
Virion
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Correct answer: D
Virion
A virion is a complete infectious virus particle outside a host cell.
Biology · Question 484
Destruction or removal of all forms of microbial life is called:
Vaccination
Sterilisation
Immunisation
Antisepsis only
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Correct answer: B
Sterilisation
Sterilisation eliminates all microbial life, including resistant spores.
Biology · Question 485
The body symmetry of most sponges is:
Bilateral
Spherical
Radial
Absent or irregular
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Correct answer: D
Absent or irregular
Most sponges are asymmetrical, although a few species show radial symmetry.
Biology · Question 486
A body cavity completely lined by mesoderm between the body wall and alimentary canal is a:
Gastrovascular cavity
Coelom
Spongocoel
Pseudocoel
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Correct answer: B
Coelom
A true coelom is completely lined by mesoderm.
Biology · Question 487
The earthworm’s principal supporting skeleton is:
Exoskeleton
No supporting system
Hydrostatic skeleton
Bony endoskeleton
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Correct answer: C
Hydrostatic skeleton
Fluid in the coelom works with body-wall muscles as a hydrostatic skeleton.
Biology · Question 488
Which invertebrate phylum was the first to evolve a closed circulatory system?
Echinodermata
Arthropoda
Annelida
Mollusca
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Correct answer: C
Annelida
Annelids possess a closed circulatory system in which blood remains within vessels.
Biology · Question 489
A trochophore larva is characteristic of which annelid class?
All annelids without exception
Polychaeta
Hirudinea
Oligochaeta
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Correct answer: B
Polychaeta
Many marine polychaetes have a free-swimming trochophore larva.
Biology · Question 490
Vomiting is produced mainly by:
Normal peristalsis
Absorption
Segmentation
Antiperistaltic movements
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Correct answer: D
Antiperistaltic movements
Reverse peristaltic contractions propel stomach contents toward the mouth.