Animal Kingdom
Which of the following molluscs possesses a radula?
A
Octopus
B
Snail
C
Mussel
D
Clam
The radula is a ribbon-like feeding structure with teeth found in gastropods (snails) and many other molluscs, used for scraping food.
The phenomenon where organisms show similar structures performing different functions is called:
A
Convergent evolution
B
Homology
C
Analogy
D
Divergent evolution
Correct Answer:
C. Analogy
Analogy refers to similar structures with different origins performing similar functions (e.g., bat wing and bird wing).
Which class of vertebrates is characterized by the presence of feathers and air sacs?
A
Mammalia
B
Aves
C
Reptilia
D
Amphibia
Birds (Aves) uniquely possess feathers for insulation and flight, along with air sacs for efficient respiration.
Organisms with bilateral symmetry and no true body cavity belong to which phylum?
A
Platyhelminthes
B
Nematoda
C
Annelida
D
Arthropoda
Correct Answer:
A. Platyhelminthes
Platyhelminthes (flatworms) display bilateral symmetry and have no coelom (body cavity), distinguishing them from higher phyla.
The notochord is replaced by the vertebral column in:
A
All chordates
B
Only in fish
C
Only in adult vertebrates
D
Only in mammals
Correct Answer:
C. Only in adult vertebrates
In adult vertebrates, the notochord is replaced by the vertebral column during embryonic development, though the notochord persists in some lower chordates.
Which of the following is NOT a characteristic of arthropods?
A
Jointed appendages
B
Chitinous exoskeleton
C
Closed circulatory system
D
Segmented body
Correct Answer:
C. Closed circulatory system
Arthropods have an open circulatory system, not closed. They are characterized by jointed appendages, chitinous exoskeleton, and segmented bodies.
The water vascular system is unique to which phylum?
A
Mollusca
B
Arthropoda
C
Echinodermata
D
Chordata
Correct Answer:
C. Echinodermata
Echinoderms (starfish, sea urchins) possess a characteristic water vascular system used for locomotion and feeding.
Which phylum contains animals with a true coelom and closed circulatory system?
A
Platyhelminthes
B
Annelida
C
Nematoda
D
Porifera
Correct Answer:
B. Annelida
Annelida (earthworms, leeches) are characterized by a true coelom and closed circulatory system with blood vessels.
Cnidarians are characterized by the presence of:
A
Nematocysts and radial symmetry
B
Tube feet and bilateral symmetry
C
Jointed legs and exoskeleton
D
Notochord and dorsal nerve cord
Correct Answer:
A. Nematocysts and radial symmetry
Cnidarians (jellyfish, corals, sea anemones) possess nematocysts (stinging cells) and exhibit radial symmetry, which is their defining characteristic.
Which of the following is the correct hierarchical classification of animals?
A
Kingdom → Phylum → Class → Order → Family → Genus → Species
B
Kingdom → Class → Phylum → Order → Family → Genus → Species
C
Kingdom → Phylum → Order → Class → Family → Genus → Species
D
Phylum → Kingdom → Class → Order → Family → Genus → Species
Correct Answer:
A. Kingdom → Phylum → Class → Order → Family → Genus → Species
The correct taxonomic hierarchy from largest to smallest grouping is Kingdom, Phylum, Class, Order, Family, Genus, and Species (KPCOFGS).
