Assertion (A): | Platyhelminthes are commonly known as flatworms |
Reason (R): | They have a dorso-ventrally flattened body |
1. | Both (A) and (R) are true and (R) is the correct explanation for (A) |
2. | Both (A) and (R) are true but (R) is not the correct explanation for (A) |
3. | (A) is true, (R) is false |
4. | (R) is true (A)is false |
A: | Platyhelminthes are triploblastic, pseudocoelomate and bilaterally symmetrical organisms. |
B: | Ctenophores reproduce only sexually and fertilization is external. |
C: | In tapeworm, fertilization is internal but sexes are not separate. |
D: | Ctenophores are exclusively marine, diploblastic and bioluminescent organisms. |
E: | In sponges, fertilization is external and development is direct. |
1. | (A), (C) and (D) only | 2. | (B), (C) and (D) only |
3. | (A) and (E) only | 4. | (B) and (D) only |