a: | body bears eight external rows of ciliated comb plates, which help in locomotion. |
b: | reproduction takes place only by asexual means. |
c: | digestion is both extracellular and intracellular. |
d: | sexes are separate. |
1. | a and c only | 2. | b and d only |
3. | a, b and c only | 4. | a, b and d only |
Statement I: | Planaria is a free-living flatworm and possesses high regeneration capacity. |
Statement II: | Hooks and suckers are present in parasitic flatworms. |
The structure shown in the given figure helps flatworms in:
1. Catching food and digesting it
2. Exchange of gases
3. Excretion and Osmoregulation
4. Regeneration of lost body parts
I: | has dorso-ventrally flattened body |
II: | is an endoparasite in human beings |
III: | has hooks and suckers present at its anterior end |
1. | Platyhelminthes | 2. | Annelida |
3. | Aschelminthes | 4. | Cnidaria |
Statement I: | Alimentary canal is complete with a well-developed muscular pharynx. |
Statement II: | An excretory tube removes body wastes from the body cavity through the excretory pore. |
Statement III: | They are dioecious and males are longer than females. |
1. | Only Statement II |
2. | Only Statement III |
3. | Only Statement I and Statement II |
4. | Only Statement II and Statement III |
1. Annelida | 2. Platyhelminthes |
3. Aschelminthes | 4. Chordata |
1. | Aquatic annelids like Nereis possess lateral appendages, parapodia, which help in swimming. |
2. | Nereis is dioecious. |
3. | Earthworm is monoecious. |
4. | Hirudinaria, blood-sucking leech, is an annelid that lacks true coelom and metamerism. |
I: | They are bilaterally symmetrical, triploblastic, non-segmented and pseudocoelomate animals. |
II: | Arthropoda is the largest phylum of Animalia and includes more than 90 % of all species on the earth that are named so far. |
III: | Insects are arthropods with body consisting of head, thorax and abdomen. |
1. | Only I | 2. | Only I and II |
3. | Only III | 4. | Only II and III |