Animalscaretips
- What is the significance of choanoflagellates in animal evolution?
- What is the connecting link between protozoa and sponges?
- Which of the following is a connecting link between protozoa and porifera?
- What do choanoflagellates do?
- How are choanoflagellates closely related to animals?
- Why is Archaeopteryx considered to be a connecting link?
- What is the difference between protozoa and porifera?
- What is the connecting link between Arthropoda and Mollusca?
- How do porifera feed?
- Why is Balanoglossus considered as a connecting link between non-chordates and chordates?
- Do choanoflagellates have true tissues?
- What is metazoan cell?
- Are choanoflagellates autotrophic or heterotrophic?
- Which of the following do Choanoflagellates resemble?
- What are Choanoflagellates quizlet?
- How are choanoflagellates and sponges similar?
- Is Archaeopteryx a living fossil?
- Why is Archaeopteryx considered a link between reptiles and birds?
- Why is Archaeopteryx considered as the bridge animal?
What is the significance of choanoflagellates in animal evolution?
As the closest living relatives of animals, choanoflagellates serve as a useful model for reconstructions of the last unicellular ancestor of animals.
What is the connecting link between protozoa and sponges?
Proterospongia is considered as a connecting link between protozoa and the porifera because it has both protozoan and poriferan characters like it is a colonial protozoan and its cells are similar to collar cells of sponges.
Which of the following is a connecting link between protozoa and porifera?
- Proterospongia is a protozoan of colonial origin. It is composed of flagellated and collared individuals resembling sponges' choanocytes (collar cells). This is, thus, the relation between Protozoa and Porifera.
What do choanoflagellates do?
Choanoflagellates are voracious single-cell predators. The beating of their long flagellum both propels them through the water and creates a current that helps them to collect bacteria and food particles in the collar of 30 to 40 tentaclelike filaments at one end of the cell.
How are choanoflagellates closely related to animals?
Choanoflagellates are among the closest living single-celled relatives of metazoans. This relationship means that choanoflagellates are to metazoans — all animals, from sponges to flatworms to chordates — what chimpanzees are to humans.
Why is Archaeopteryx considered to be a connecting link?
Archaeopteryx is known to be a communicating connection between reptiles and birds because it looks like a bird and has bird wings. ... Since it implies that birds evolved from reptiles. Therefore Archaeopteryx links reptiles and birds.
What is the difference between protozoa and porifera?
Protozoa are single-celled animal-like organisms such as paramecium, amoebas, etc. Porifera is simply the phylum for sponges. Porifera means "pore bearer" because sponges have holes or pores in which they filter food from the water.
What is the connecting link between Arthropoda and Mollusca?
(a) Molluscs and arthropods.
How do porifera feed?
Sponges have a unique feeding system among animals. Instead of a mouths they have tiny pores (ostia) in their outer walls through which water is drawn. Cells in the sponge walls filter food from the water as the water is pumped through the body and the osculum ("little mouth").
Why is Balanoglossus considered as a connecting link between non-chordates and chordates?
Balanoglossus is the connecting link between chordates and non-chordates. Because notochord and pharyngeal characteristics are found in Balanoglossus. ... Hence it is the connecting link between chordates and non-chordates.
Do choanoflagellates have true tissues?
This differentiation of cell types makes sponges multicellular. Unlike sponges, choanoflagellate cells do not share food particles. ... In this regard, it is said that sponges do not have “true” tissues. All other animals have true tissues.
What is metazoan cell?
Definition of metazoan
: any of a group (Metazoa) that comprises all animals having the body composed of cells differentiated into tissues and organs and usually a digestive cavity lined with specialized cells.
Are choanoflagellates autotrophic or heterotrophic?
Choanoflagellates are unicellular or colonial protists found in marine and freshwater environments, in both planktonic and benthic communities. They are heterotrophic phagotrophs (Richter & Nitsche, 2017b).
Which of the following do Choanoflagellates resemble?
Choanoflagellates are morphologically similar to the choanocytes of sponges and were therefore proposed to represent the closest living relatives of metazoans (King et al., 2008; von Salvini-Plawen, 1978).
What are Choanoflagellates quizlet?
Describe the choanoflagellates: - Collar surrounds flagellum. - Choanflagellate means "collared flagellate" - Single-celled organism.
How are choanoflagellates and sponges similar?
Choanoflagellate cells have a whip-like flagellum surrounded by a basket-like structure that they use to capture and eat bacteria floating in sea water. Interestingly, these cells look and function very similar to feeding cells of sponges, one of the earliest-branching groups of animals.
Is Archaeopteryx a living fossil?
Archaeopteryx is not a living fossil in fact it is a connecting link between the birds and the reptiles while King crab, Sphenodon, and Peripatus are the living fossils. Archaeopteryx is basically known to be the connecting link between birds and reptiles as it looks like a bird and possesses bird wings.
Why is Archaeopteryx considered a link between reptiles and birds?
Archaeopteryx is known to be a communicating connection between reptiles and birds because it looks like a bird and has bird wings. The teeth and tail, however, are closer to those of reptiles. Since it implies that birds evolved from reptiles. Therefore Archaeopteryx links reptiles and birds.
Why is Archaeopteryx considered as the bridge animal?
They are called bridge animals because they have the characters of both birds and reptiles .
