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Q. No.In Obelia:
a:
both polyp and medusa forms exist during its life cycle
b:
metagenesis, a sort of alternation of generation, is seen
c:
polyps produce medusae sexually and medusae form the polyps sexually
1.
only a is correct
2.
only a and b are correct
3.
only c is correct
4.
a, b and c are correct
Subtopic: Phylum Coelenterata |
74%
Level 2: 60%+
Hints
In Ctenophora:
The correct statements are:
| 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 |
Subtopic: Phylum Ctenophora |
65%
Level 2: 60%+
Hints
Members of the Phylum Platyhelminthes differ from animals belonging to Phylum Annelida and Phylum Arthropoda in:
| 1. | having two germ layers instead of three |
| 2. | lacking a coelom |
| 3. | showing bioluminescence |
| 4. | having a complete digestive system |
Subtopic: Phylum Platyhelminthes |
68%
Level 2: 60%+
Hints
Metamerism evolved for the first time in the members of the Phylum:
| 1. | Annelida | 2. | Platyhelminthes |
| 3. | Aschelminthes | 4. | Chordata |
Subtopic: Phylum Annelida |
80%
Level 1: 80%+
Hints
Unlike Arthropods, Annelids:
| 1. | have a true coelom lined by embryonic mesoderm |
| 2. | have a closed circulatory system |
| 3. | do not reproduce by sexual methods |
| 4. | have a complete digestive system |
Subtopic: Phylum Annelida |
69%
Level 2: 60%+
Hints
Identify the incorrect statement regarding Mollusca:
| 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. |
Subtopic: Phylum Mollusca |
65%
Level 2: 60%+
Hints
Which of the following will be correct regarding Echinoderms?
| 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. |
Subtopic: Phylum Echinodermata |
71%
Level 2: 60%+
Hints
Consider the given two statements:
| 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. |
Subtopic: Phylum Hemichordata |
Level 4: Below 35%
Hints
In hemichordates:
| 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 |
Subtopic: Phylum Hemichordata |
54%
Level 3: 35%-60%
Hints
Which of the following features will be seen in chordates but not in non-chordates?
| (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 |
Subtopic: Phylum Chordata |
74%
Level 2: 60%+
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