Which of the following groups is NOT classified as a Chordate: a. Urochordate Wh

Question

Which of the following groups is NOT classified as a Chordate: a. Urochordate Which of the segmented b. Mammals. a. annelids. c. Cephalochordate b. bryozoa d. Cartilaginous fishes c, flatworm e. Hemichordates d. mollusk e, nemato TRUE or FALSE. All mollusks exhibit some form of torsion, the TRUE or rotation of the visceral mass. plastids happen In a typical animal life cycle, adults are what ploidy? a. Haploid b. Diploid c. Triploid d. Dikaryotic e. Constantly varies There are animal species in which the ploidy of adults is not typical. Can you name one? Chordates a. all have a backbone b, include some animals that are unicellular c. pass through a developmental stage with pharyngeal slits d. are represented in the fossil record beginning in the Silurian e. are all filter feeders

Explanation / Answer

Answer 1: Phylum Chordata is characterized by the presence of notochord. However, the notochord of hemichordates is not a true notochord, and the central nervous system containing a longitudinal ventral nerve strand shows the characteristic of major invertebrate phyla.

Answer 2: False: Not all mollusks exhibit torsion. Torsion or twisting is the rotation of visceral organs in anticlock-direction during larval development. This phenomenon takes place in the free-swimming larva of gastropods and converts the symmetrical larva into an asym­metrical adult.

Answer 3: In a typical animal life cycle, adults are Diploid. Nearly all animals have a diploid-dominant life cycle in which the only haploid cells are the gametes.

Answer 4: Among Ciliates, the macronucleus is called ampliploid (a hybrid organism having a diploid set of chromosomes from each parental species). because only part of the genome is amplified.

Answer 5: Chordates: Pass through a development stage with pharyngeal slit. This is one peculiar feature of organism under chordata.

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.