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Which one of the following phyla is correctly matched with its two general characteristics? [2008]
  • a)
    Arthropoda - Body divided into head, thorax and abdomen and respiration by tracheae
  • b)
    Chordata - Notochord at some stage and separate anal and  urinary openings to the  outside
  • c)
    Echinodermata - Pentamerous  radial symmetry and mostly internal fertilization
  • d)
    Mollusca - Normally oviparous and development through a trochophore or veliger larva
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Which one of the following phyla is correctly matched with its two gen...
Mollusca mostly oviparous and a few viviparous. The development may be direct or indirect with trochophore, velliger and glochidium. 
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Most Upvoted Answer
Which one of the following phyla is correctly matched with its two gen...
Phylum Mollusca and its characteristics

Body plan:
- Soft-bodied animals with a muscular foot, visceral mass, and mantle
- Many have a hard, protective shell made of calcium carbonate

Reproduction and development:
- Most are dioecious (separate sexes) and oviparous (lay eggs)
- Development typically includes a trochophore larval stage followed by a veliger larval stage before reaching adulthood

Other general characteristics:
- Open circulatory system with a heart and blood vessels
- Radula, a ribbon-like structure with rows of teeth, used for feeding
- Most have a well-developed nervous system with a brain and sensory organs such as eyes and tentacles

Examples of mollusks:
- Gastropods: snails, slugs
- Bivalves: clams, oysters, mussels
- Cephalopods: squid, octopuses, cuttlefish

Overall, the correct answer is (d) Mollusca - Normally oviparous and development through a trochophore or veliger larva. The other options do not correctly match the phylum with its characteristics. Arthropoda should include jointed appendages as a characteristic, Chordata should include a dorsal nerve cord, and Echinodermata should include a water vascular system.
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Community Answer
Which one of the following phyla is correctly matched with its two gen...
A and d both are correct
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Which one of the following phyla is correctly matched with its two general characteristics? [2008]a)Arthropoda - Body divided into head, thorax and abdomen and respiration by tracheaeb)Chordata - Notochord at some stage and separate anal and urinary openings to the outsidec)Echinodermata - Pentamerous radial symmetry and mostly internal fertilizationd)Mollusca - Normally oviparous and development through a trochophore or veliger larvaCorrect answer is option 'D'. Can you explain this answer?
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