What does Chordata mean?
: any of a phylum (Chordata) of animals having at least at some stage of development a notochord, dorsally situated central nervous system, and gill slits and including the vertebrates, lancelets, and tunicates.
How do invertebrate chordates reproduce?
Invertebrate chordates reproduce typically through sexual means, with some capable of asexual reproduction. There are four key characteristics that are common to chordates in all three subphyla. These traits are observed at some point during the development of the organisms.
What animal develops indirectly?
Animals Associated With Indirect Development Some echinoderms, amphibians and insects undergo indirect development: butterflies, dragonflies, frogs and so forth. The larva or young form of these creatures often fulfill a different ecological niche than the adult animal does.
Do chordates reproduce sexually or asexually?
Reproduction in beings of the phylum Chordata is sexual with the exception of urochordates that can also reproduce asexually. In some classes cyclostomes osteichthyes fishes and amphibians there is larval stage.
Who named Chordata?
Although the name Chordata is attributed to William Bateson (1885), it was already in prevalent use by 1880. Ernst Haeckel described a taxon comprising tunicates, cephalochordates, and vertebrates in 1866.
What is difference between direct and indirect speech?
Direct speech describes when something is being repeated exactly as it was – usually in between a pair of inverted commas. Indirect speech will still share the same information – but instead of expressing someone’s comments or speech by directly repeating them, it involves reporting or describing what was said.
What is difference between chordates and non Chordata?
The major point to differentiate between chordates and non-chordates is that chordates have a spinal cord or backbone in their body structure whereas non-chordates are without backbone or notochord in their body structure. …
What is Chordata and non Chordata?
1) Animal having a notocord or backbone in their body structure are called chordates. 1) Animals without a notochord are called non-chordates. 2) Central nervous system is hollow and dorsal. 2) It is solid and ventral.
What are the merits and demerits of indirect democracy?
- Realistic, practicable form of democracy.
- Allows a level of popular participation = high level of accountability.
- Recent proportional electoral system has strengthened representative democracy in Scotland and Wales.
- Politicians posses expert knowledge.
What are the 5 classes of Chordata?
Within Chordata there are five classes of animals: fish, amphibians, reptiles, birds, and mammals.
Which animals are chordates?
Chordates (Chordata) are a group of animals that includes vertebrates, tunicates, lancelets. Of these, the vertebrates—lampreys, mammals, birds, amphibians, reptiles, and fishes—are the most familiar and are the group to which humans belong.
Does Chordata mean vertebrate?
Chordate, any member of the phylum Chordata, which includes the vertebrates (subphylum Vertebrata), the most highly evolved animals, as well as two other subphyla—the tunicates (subphylum Tunicata) and cephalochordates (subphylum Cephalochordata).
What is the example of indirect democracy?
Answer. Answer: Indirect democracy is when the people elect representatives who vote on laws on the behalf of the people. An example of indirect democracy is when we elect people to Congress to represent us.
Who has a direct democracy?
Most western countries have representative systems. Switzerland is a rare example of a country with instruments of direct democracy (at the levels of the municipalities, cantons, and federal state). Citizens have more power than in a representative democracy.
What is non Chordata?
Non-chordates are animals without a notochord – the rod-like elastic structure that supports the body. Members of phylum Porifera, Coelenterata, Ctenophora, Platyhelminthes, Aschelminthes, Annelida, Arthropoda, Mollusca, Echinodermata and Hemichordata fall under Non-chordates.
What are the 7 classes of chordates?
What are the 5 animal classes?
The phylum chordata (animals with backbones) is divided into five common classes: fish, amphibians, reptiles, mammals and birds. Show examples of these groups and explain the characteristics that make one different from another.
Which country has indirect democracy?
Most countries today have indirect democracies. Four countries having indirect democracy are India, the USA, Canada and the UK.
What makes an animal a chordate?
A chordate (/ˈkɔːrdeɪt/) is an animal of the phylum Chordata (/kɔːrˈdeɪtə/). During some period of their life cycle, chordates possess a notochord, a dorsal nerve cord, pharyngeal slits, and a post-anal tail: these four anatomical features define this phylum.
What are the two types of indirect democracy?
Indirect democracy too has many forms: (i) Parliamentary or Cabinet Form; (ii) Presidential Form; (iii) Unitary Form, and (iv) Federal Form. There are many mixed forms of indirect democracy.
Do non chordates have heart?
The heart is ventrally placed in Chordates; whereas it is absent or dorsally or laterally placed in Non-chordates. Chordates can be cold or warm-blooded, while Non-chordates are cold-blooded only. Nerve cord is single, dorsal, without ganglia in Chordates and in Non-chordates it is double, ventral, and with ganglia.
What is the other name of indirect democracy?
Indirect democracy (also called representative democracy) – is where citizens choose others to represent them, making important decisions on their behalf.