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प्रश्न
Distinguish between Nonchordata and Chordata.
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उत्तर
| Nonchordates | Chordates |
| 1. Notochord is absent in them | 1. Notochord is present in them at some of their developmental stage. |
| 2. Their central nervous system is solid and ventral | 2. Their central nervous system is hollow and dorsal. |
| 3. Heart, if present in them, is dorsal in position. | 3. Heart is always present and it is ventral in position. |
| 4. Their circulatory system is of open or closed type. | 4. Their circulatory system is of closed type. |
| 5. Respiratory pigment, the haemoglobin, if present, is dissolved in plasma of blood. | 5. Haemoglobin is present in their red blood cells or corpuscles. |
| 6. Pharyngeal gill slits are absent in them. | 6. Pharyngeal gill-slits are present in them. |
| 7. They contain anus at posterior end of body, so post-anal tail is not present. | 7. Their anus is not located at posterior tip of body, so contain a post-anal tail. |
संबंधित प्रश्न
What are the differences between animals belonging to the Aves group and those in the mammalia group?
What are the difficulties that you would face in classification of animals, if common fundamental features are not taken into account?
Match the following:
| Column I | Column II | ||
| (a) | Operculum | (i) | Ctenophora |
| (b) | Parapodia | (ii) | Mollusca |
| (c) | Scales | (iii) | Porifera |
| (d) | Comb plates | (iv) | Reptilia |
| (e) | Radula | (v) | Annelida |
| (f) | Hairs | (vi) | Cyclostomata and Chondrichthyes |
| (g) | Choanocytes | (vii) | Mammalia |
| (h) | Gill slits | (viii) | Osteichthyes |
Tick (✓) the appropriate answer:
Scientist who introduced binomial nomenclature is
Match the animals given under column A with their respective classification group given under column B
| Column A | Column B | ||
| 1 | Sponge | a | Amphibia |
| 2 | Snail | b | Reptilia |
| 3 | Butterfly | c | Echinodermata |
| 4 | Toad | d | Mollusca |
| 5 | Lizard | e | Arthropoda |
| 6 | Starfish | f | Porifera |
What is difference between bilateral symmetry and radial symmetry?
Describe some flight adaptations of the birds.
Give one point of difference between notochord and nerve cord.
How do animals of Porifera differ from animals of Cnidaria?
Write down four general characters of Porifera.
Write down four general characters of cnidarians (coelenterates).
What are the group names of the following categories of animals?
Animals with feathers _________
Write the name of a mammal who lives in water.
Give two examples of each of the following: Platyhelminthes
Give two examples of each of the following: Arthropoda
Fill in the blanks:
Bath sponge belongs to phylum ______.
Choose the correct answer: Mosquito is included in insects because
Choose the correct answer: Jelly-fish is classified in the phylum
Assertion: Binomial name is the universal name and contains two names.
Reason: It was first introduced by Carolus Linnaeus
