Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following levels of organization is characteristic of Phylum Hemichordata?
The NCERT text states that Hemichordates are 'worm-like marine animals with organ-system level of organisation.' This is indicative of more complex animals where organs work together to form systems.
Regarding the symmetry and germ layer organization, Hemichordates are:
The NCERT text describes Hemichordates as 'bilaterally symmetrical, triploblastic and coelomate animals.' This combination refers to their body plan and embryonic germ layers.
Which of the following organisms are examples of Phylum Hemichordata?
The NCERT text lists 'Balanoglossus' and 'Saccoglossus' as examples of Hemichordata. Asterias and Ophiura are Echinoderms; Pila and Octopus are Molluscs; Limulus and Locusta are Arthropods.
The stomochord, a rudimentary structure in the collar region of Hemichordates, is considered similar to what structure in Chordates?
The NCERT text states, 'Hemichordates have a rudimentary structure in the collar region called stomochord, a structure similar to notochord.'
How does the coelomic condition of Hemichordata compare to that of Aschelminthes?
The NCERT text describes Hemichordates as 'coelomate animals.' In contrast, Aschelminthes are explicitly mentioned as 'pseudocoelomates' in the summary section.
Which characteristic is unique to Hemichordata among the specified options, according to the provided text?
The NCERT text states, 'The body is cylindrical and is composed of an anterior proboscis, a collar and a long trunk' as a defining feature of Hemichordata. Water vascular system is characteristic of Echinodermata, chitinous exoskeleton of Arthropoda, and choanocytes of Porifera.
Which of the following describes the body cavity observed in Aschelminthes?
The NCERT summary states: 'Aschelminthes are pseudocoelomates and include parasitic as well as non-parasitic roundworms.' This directly answers the question about their body cavity.
Aschelminthes commonly include which type of worms?
The NCERT summary mentions: 'Aschelminthes are pseudocoelomates and include parasitic as well as non-parasitic roundworms.' This clearly defines them as roundworms.
Which of the following phyla exhibits an organ level of organization?
The text states: 'A still higher level of organisation, i.e., organ level is exhibited by members of Platyhelminthes and other higher phyla where tissues are grouped together to form organs, each specialised for a particular function.' Aschelminthes are considered a 'higher phyla' than sponges and coelenterates and exhibit organ-system level, but among the given options, Platyhelminthes is the first to show organ level.
Which of the following characteristics is common to all members of Phylum Aschelminthes mentioned in the context?
The NCERT summary states: 'Aschelminthes are pseudocoelomates and include parasitic as well as non-parasitic roundworms.' This is a defining characteristic of the phylum. Suckers and hooks are characteristic of parasitic Platyhelminthes, metameric segmentation is for Annelida, and calcareous shell for Mollusca.
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