Sharks and dogfishes differ from skates and rays by:
1.
Gill slits are ventrally placed
2.
Head and trunk are widened considerably
3.
Distinct demarcation between body and tail
4.
Their pectorals fins are distinctly marked off from cylindrical bodies
Subtopic: Â Comparative study of Cartilagenous & Bony Fishes |Â Class Chondrichthyes |
 54%
NEET - 2013
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NEET 2025 - Target Batch
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Given below are two statements:
| Assertion (A): | Syrnix is a characteristic feature of birds. |
| Reason (R): | Syrnix reduces body weight & helps in flights. |
| 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. |
Subtopic: Â Study of Aves & Mammals |
 50%
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Assertion (A): Radial symmetry in animals is advantageous in detecting food and danger.
Reason (R): It allows the animal to be able to respond to stimulus from any direction.
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.
Reason (R): It allows the animal to be able to respond to stimulus from any direction.
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.
Subtopic: Â Basis of Classification |
 65%
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Assertion (A): Tapeworm, roundworm and pinworm are endoparasites of human intestine.
Reason (R): Improperly cooked food is one of the main causes of intestinal infections.
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.
Reason (R): Improperly cooked food is one of the main causes of intestinal infections.
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.
Subtopic: Â Phylum Ctenophora |Â Phylum Aschelminthes |Â Phylum Platyhelminthes |
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Identify the option where all given animals belong to the same phylum:
| 1. | Squid, Devil fish, Flying fish, Dogfish |
| 2. | Apple snail, Pearl oyster, Brittle star, Brain coral |
| 3. | Sea urchin, Sea lily, Sea cucumber, Sea horse |
| 4. | Cuttlefish, Sea-hare, Tusk shell, Chiton |
Subtopic: Â Phylum Mollusca |
 73%
From NCERT
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Members of Chondrichthyes are characterised by all the following except:
| 1. | Presence of a swim bladder |
| 2. | Ventrally located mouth |
| 3. | Lack of operculum |
| 4. | Placoid scales |
Subtopic: Â Comparative study of Cartilagenous & Bony Fishes |Â Class Chondrichthyes |
 81%
From NCERT
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Consider the two statements:
| Assertion (A): | Hemichordata was earlier considered as a sub-phylum under non-chordata but now it is placed as a separate Class under Chordata. |
| Reason (R): | Hemichordates have a rudimentary structure in the collar region called stomochord, a structure homologous to notochord. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | (A) is True but (R) is False. |
| 3. | Both (A) and (R) are False. |
| 4. | Both (A) and (R) are True but (R) does not correctly explain (A). |
Subtopic: Â Phylum Hemichordata |
 62%
From NCERT
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Match each item in Column I with one in Column II and select the correct match from the codes given:
Codes:
| Column I [Phylum] |
Column II [Characteristic] |
||
| A. | Porifera | P. | Water vascular system |
| B. | Aschelminthes | Q. | Canal system |
| C. | Echinodermata | R. | Pseudocoelom |
| D. | Hemichordata | S. | Stomochord |
| A | B | C | D | |
| 1. | Q | R | P | S |
| 2. | S | R | Q | P |
| 3. | Q | S | R | P |
| 4. | R | S | P | Q |
Subtopic: Â Phylum Porifera |Â Phylum Aschelminthes |Â Phylum Echinodermata |Â Phylum Hemichordata |
 92%
From NCERT
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Identify a vertebrate chordate amongst the following:
| 1. | Ascidia | 2. | Doliolum |
| 3. | Brannchiostoma | 4. | Petromyzon |
Subtopic: Â Phylum Chordata |
 75%
From NCERT
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Match each item in Column-I with one in Column-II and select the correct match from the codes given:
Codes:
| Column I | Column II | ||
| A. | Radula | P. | Osteichthyes |
| B. | Operculum | Q. | Molluska |
| C. | Flame cell | R. | Flat worms |
| D. | Hair | S. | Mammalia |
| A | B | C | D | |
| 1. | P | S | Q | R |
| 2. | Q | P | R | S |
| 3. | Q | R | P | S |
| 4. | R | Q | S | P |
Subtopic: Â Phylum Ctenophora |Â Phylum Mollusca |Â Phylum Chordata |Â Comparative study of Cartilagenous & Bony Fishes |Â Study of Aves & Mammals |
 94%
From NCERT
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