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 |
Column I | Column II | ||
A. | Insect reared for producing silk | P. | Locusta |
B. | Mosquito acting as vector for Dengue virus | Q. | Bombyx |
C. | Gregarious pest | R. | Limulus |
D. | Living fossil | S. | Aedes |
A | B | C | D | |
1. | Q | S | P | R |
2. | Q | S | R | P |
3. | P | Q | R | S |
4. | R | P | Q | S |
1. | It is the second largest animal Phylum after Phylum Arthropoda. |
2. | It includes animals that are bilaterally symmetrical, triploblastic, and coelomate. |
3. | Body is covered with a calcareous shell and is metamerically segmented with a distinct head, muscular foot, and visceral hump. |
4. | Gills are present in the mantle cavity, a space between the mantle and the hump. |
1. | Pinctada | Pearl Oyster |
2. | Aplysia | Sea hare |
3. | Dentalium | Tusk shell |
4. | Loligo | Devil fish |
1. | They have bilateral symmetry as adults and radial symmetry as larvae. |
2. | They are triploblastic and coelomates. |
3. | They possess a well-developed excretory system. |
4. | They have an incomplete digestive system. |
1. | Sea Urchin | 2. | Sea lily |
3. | Brittle star | 4. | Brain coral |
Statement 1: | Hemichordates were earlier considered as a sub-phylum under Phylum Chordata but are now placed separately in a phylum under non-Chordata. |
Statement 2: | Hemichordates have a rudimentary structure in the collar region called stomochord, a structure homologous to the notochord. |
1. | Both Statement 1 and Statement 2 are correct but Statement 2 does not explain Statement 1. |
2. | Statement 1 is correct and Statement 2 is incorrect. |
3. | Both Statement 1 and Statement 2 are incorrect. |
4. | Both Statement 1 and Statement 2 are correct and Statement 2 explains Statement 1. |
1. | Circulatory system is a closed type |
2. | Proboscis gland is a digestive gland that secretes a large number of hydrolytic enzymes |
3. | Respiration takes place through the gills |
4. | Sexes are not separate, fertilization is internal and development is direct |
a. | A notochord |
b. | Ventral, solid, and double central nervous system |
c. | Pharynx perforated by gill slits |
d. | Ventral heart |
e. | Terminal anus and a lack of post-anal tail |
1. | a, c, and d only | 2. | a, b. and e only |
3. | a and c only | 4. | b, c, and d only |