In metamerism, there is serial repetition of unit subdivisions of:
I. | Ectoderm products |
II. | Mesoderm products |
III. | Endoderm products |
1. | Only II | 2. | Only I and II |
3. | Only II and III | 4. | I, II and III |
Assertion (A): | Roundworms (phylum Nematoda) are pseudocoelomates. |
Reason (R): | Pseudocoelom provides protection for internal organs and facilitates movement of nutrients. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
a. | All multicellular animals exhibit the same pattern of organisation of cells. |
b. | Organ level of organisation is exhibited by members of Platyhelminthes and other higher phyla where tissues are grouped together to form organs. |
c. | Organ systems in different groups of animals exhibit various patterns of complexities. |
d. | In all multicellular animals which have organ level of body organisation, a complete digestive system has two opening, mouth and anus. |
Fasciola, Pila, Chaetopleura, Ancylostoma, Saccoglossus, Meandrina, Hirudinaria, Labeo, Ichthyophis |
Statement I: | All animals with bilateral symmetry are triploblastic. |
Statement II: | All animals with bilateral symmetry may not have a coelom. |
1. | Statement I is correct but Statement II is incorrect. |
2. | Statement I is incorrect but Statement II is correct. |
3. | Both Statement I and Statement II are correct. |
4. | Both Statement I and Statement II are incorrect |
An animal with the following body wall organization will not have:
1. Cephalization
2. Three germ layers
3. Bilateral symmetry
4. A complete digestive tract
I: | They are exclusively marine. |
II: | They have cellular level of organisation. |
III: | They have a water vascular system with tube feet. |
IV: | Digestion is intracellular. |
V: | Fertilisation is external and development is direct. |
Consider the given two statements:
Assertion (A): | Roundworms are considered pseudocoelomates. |
Reason (R): | They have a body cavity not lined with mesoderm. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
I: | having radial symmetry in adults and larvae |
II: | having three germ layers |
III: | lacking a coelom |