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प्रश्न
What is difference between bilateral symmetry and radial symmetry?
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उत्तर
| Bilateral Symmetry | Radial Symmetry |
| 1. Limbs and organs are paired. |
1.Limbs and organs occur all around the central axis. |
| 2. Cephalization is present. | 2. Cephalization is absent. |
| 3. The animals body can be divided into two equal halves (i.e., mirror images) by one plane called midsagittal plane. | 3. The animal’s body can be divided into two equal halves by any vertical plane passing through the central axis. |
| Examples. Earthworm, fish, frog, human, being, etc. | Examples. Hydra, starfish, etc. |
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संबंधित प्रश्न
Explain how animals in Vertebrata are classified into further subgroups.
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
Write one difference between the following pair:
Invertebrates and Vertebrates
Write down four main characters of Platyhelminthes. Give two examples.
What do you mean by the term triploblastic animals? Give two example.
Write down four characters of Osteichtyes and give two examples.
Write down four characters of mammals. Give two examples.
Describe some flight adaptations of the birds.
Give an example each of Urochordata and Cephalochordata.
Distinguish between Nonchordata and Chordata.
Why are scientific names of living beings considered better than their common names?
What are the group names of the following categories of animals?
Animals with a backbone _____________
What are the group names of the following categories of animals?
Animals with a hairy skin ___________
Give any one difference between the following :
Flatworm and Roundworm
Write the name of oviparous mammal.
Fill in the blanks:
The excretory organs of platyhelminthes are ______.
Fill in the blanks:
Dog fish belongs to phylum ______.
Write the binomial name of
- Human being
- Paddy
Consider the following statements:
- Annelids are true coelomates
- Poriferans are pseudocoelomates
- Aschelminthes are acoelomates
- Platyhelminthes are pseudocoelomates
Choose the correct answer from the options given below:
