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प्रश्न
Give scientific reasons.
Balanoglossus is connecting link between non-chordates & chordates.
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उत्तर
- Balanoglossus shows some characteristics of non-chordates.
- It also has a notochord, as in the case of chordates.
- Since it shares the characteristics of nonchordates and chordates, from the viewpoint of evolution, it is called the connecting link between them.
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संबंधित प्रश्न
Which of the following is a hermaphrodite animal?
In how many parts is the body of Hemichordates divided?
Draw a neat and labelled diagram.
Herdmania
Hermaphrodite organisms are ______.
State whether true or false. If false, correct the statement.
Balanoglossus is a ciliary feeder.
______ has gill slits but does not have a notochord.
Which of the following is NOT true for Hemichordata?
Hemichordates have now been placed with the non-chordates close to echinoderms, because :
Differentiate between notochord and nerve cord
Excretory organs of different animals are given below. Choose correctly and write in the space provided.
| Animal | Excretory Organ/Unit |
| a. Balanoglossus | i. Metanephridia |
| b. Leech | ii. Nephridia |
| c. Locust | iii. Flame cells |
| d. Liver fluke | iv. Absent |
| e. Sea urchin | v. Malpighian tubule |
| f. Pila | vi. Proboscis gland |
a. ______, b. ______, c. ______
d. ______, e. ______, f. ______
Select the correct statements with reference to chordates.
- Presence of mid-dorsal, solid and double nerve cord.
- Presence of closed circulatory system.
- Presence of paired pharyngeal gill slits.
- Presence of dorsal heart E. Triploblastic pseudocoelomate animals.
Choose the correct answer from the options given below:
Radial symmetry is NOT found in adults of phylum ______.
