Which of the following phylum or class exhibit the presence of a notochord?
Important Questions on Animal Kingdom
Select the correct statement related to chordates.
A. Presence of a mid-dorsal, solid and double nerve cord.
B. Presence of closed circulatory system.
C. Presence of paired pharyngeal gillislits.
D. Presence of dorsal heart
E. Triploblastic pseudocoelomate animals.
Choose the correct answer from the options given below:
Which of the following statements are true for the phylum-Chordata?
(a) In Urochordata, notochord extends from head to tail, and it is present throughout their life.
(b) In Vertebrata, the notochord is present during the embryonic period only.
(c) Central nervous system is dorsal and hollow.
(d) Chordata is divided into 3 subphyla: Hemichordata, Tunicata, and Cephalochordata.
| Column-I | Column-II | ||
| P | Mollusca | i | Pseudocoelom |
| Q | Annelida | ii | Radula |
| R | Nematoda | iii | Radial symmetry |
| S | Echinodermata | iv | Segmentation |
Choose the CORRECT combination.
Given below are two statements: one is labelled as Assertion and the other is labelled as Reason.
Assertion: All vertebrates are chordates, but all chordates are not vertebrates.
Reason: Notochord is replaced by a vertebral column in the adult vertebrates.
In the light of the above statements, choose the most appropriate answer from the options given below:
Statement Chordates have a tail extending posterior to the anus. It contains skeletal elements and muscles but lacks coelom and visceral organs.
Reason In aquatic organisms, it acts as a balancing organ.
Match the following and choose correct combination.
| Column I | Column II | ||
| i) | Cellular grade level | a) | Pheretima |
| ii) | Tissue grade level | b) | Schistosoma |
| iii) | Organ level | c) | Obelia |
| iv) | Organ system level | d) | Sycon |
Match the following
| List - I | List - II | ||
| (a) | Asymmetry | (i) | Cnidaria |
| (b) | Radial symmetry | (ii) | Platyhelminthes |
| (c) | Bilateral symmetry and Enterocoelom | (iii) | Porifera |
| (d) | Bilateral symmetry without body cavity | (iv) | Hemichordata |
The correct answer is
Which of the following phyla possess body cavity as shown in the diagram below?
Match the following.
| Sub Division | Character | Example | |||
| Acoelomata | Coelom is formed by archenteron | Mollusca | |||
| Pseudocoelomata | Without a body cavity | Hemichordata | |||
| Schizocoelomata | Body cavity should not lined by mesodermal layers | Nematoda | |||
| Enterocoelomate | Coelom is formed by splitting of mesoderm | Platyhelminthes | |||
In the given diagram of the typical chordate. Identify the parts labelled as and select the correct option?
Consider following features:
- Organ system level of organisation
- Bilateral symmetry
- True coelomates with segmentation of body.
Select the correct option of animal group which possess all the above characteristics:
