Advertisements
Advertisements
Question
Write in brief about progressive changes in animal classification.
Advertisements
Solution
There were different methods of classification of animals.
- The first classification method was proposed by the Greek philosopher Aristotle. He considered characteristics such as body size, habits, and habitats of the animals. This approach was termed the artificial method of classification.
- Scientists like Theophrastus, Pliny, John Ray, Linnaeus, and others used the same artificial method.
- Further, sources were updated because science has advanced, and new ways of classifying things were proposed. Linnaeus and others.
- The ‘Natural system of classification’ was then proposed. This system of classification was based on criteria such as body organisation, cell types, chromosomes, and biochemical properties.
- Later, Dobzhansky and Meyer gave a system of classification based on evolution.
- In 1977, Carl Woese also proposed the three-domain system of animal classification.
RELATED QUESTIONS
What are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom?
Complete the following chart.
| Body cavity | Germ Layer | Phylum |
| Absent | .......... | Porifera |
| Absent | Triploblastic | .......... |
| Pseudocoelom | .......... | Aschelminthes |
| Present | .......... | Arthropoda |
Label the body organization of human in the following figure:
Draw a neat and labelled diagram.
Jellyfish
The largest division of the living world is ______.
Species is the ______ unit of classification.
Which of the following animals has a true coelom?
In Pheretima locomotion occurs with the help of ______.
Lateral line sense organs occur in ______.
Identify the structure that the archenteron becomes in a developing animal.
______ is a fluid-filled body cavity.
Which organism is called Friends of farmers? Why?
In which of the following the notochord is present only in embryonic stages?
Body cavity is the cavity present between body wall and gut wall. In some animals the body cavity is not lined by mesoderm. Such animals are called ______.
Differentiate between open circulatory system and closed circulatory system
Complete the paragraph using proper words:
(Asymmetrical, Paramecium, Equal, imaginary, central, insects, rats, bird, three, unequal)
If body of any animal is cut through ______ axis of body, it may or may not produce two equal halves. Depending upon this property, there are different types of animal bodies. In the case of ______ body, there is no any such imaginary axis of the body through which we can get two equal halves. For example Amoeba, ______ some sponges. In radial symmetry type of body, if imaginary cut passes through central axis but any plane of body, it gives two ______ halves. For example Starfish. In case of this animal, there are five different planes passing through ______ axis of body through which we can get two equal halves. In Bilateral symmetry type of body, there is only one such imaginary axis of body through which we can get two equal halves. For example: ______ fishes, frog, birds, human, etc.
