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Q. No.Assertion (A): Echinoderms possess an endoskeleton of calcareous ossicles.
Reason (R): These organisms are marine or freshwater dwellings.
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: Phylum Echinodermata |
69%
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Assertion (A): Balanoglossus possess external fertilization.
Reason (R): Saccoglossus undergo direct development during their life cycle.
1. If both assertion and reason are true, the reason is the correct explanation of the assertion.
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): Saccoglossus undergo direct development during their life cycle.
1. If both assertion and reason are true, the reason is the correct explanation of the assertion.
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: Phylum Hemichordata |
66%
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Assertion (A): Aschelminths and Annelids possess bilateral symmetry.
Reason (R): Both Aschelminths and Annelids are coelomates
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): Both Aschelminths and Annelids are coelomates
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: Phylum Annelida | Phylum Arthropoda |
80%
From NCERT
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| Assertion (A): | Choanocytes or collar cells line the spongocoel and the canals in poriferans. |
| Reason (R): | Poriferans possess spicules and spongin fibres. |
| 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: Phylum Porifera |
80%
From NCERT
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Assertion (A): All vertebrates are chordates but all the chordates are not vertebrates.
Reason (R): All the vertebrates are characterised by the presence of a notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits at some stages of the life cycle.
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): All the vertebrates are characterised by the presence of a notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits at some stages of the life cycle.
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: General Introduction: Vertebrates & Agnatha |
From NCERT
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Choose the correct statement
1. Metamerism first developed in Arthropoda
2. Triploblastic animals lacking coelom are platyhelminths and annelids
3. Coelomate animals in which blastopore forms anus are grouped under deuterostomes
4. Coelom is the body cavity found between ectoderm and outer body wall
1. Metamerism first developed in Arthropoda
2. Triploblastic animals lacking coelom are platyhelminths and annelids
3. Coelomate animals in which blastopore forms anus are grouped under deuterostomes
4. Coelom is the body cavity found between ectoderm and outer body wall
Subtopic: Phylum Arthropoda |
65%
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Read the following statements:
i. Longitudinal and circular muscles exist
ii. Body wall remains covered by the glandular epidermis
iii. Metamerism present
iv. Closed blood vascular system
The above statements exemplify which organism?
1. Flatworm
2. Ophiura
3. Wuchereria
4. Earthworm
i. Longitudinal and circular muscles exist
ii. Body wall remains covered by the glandular epidermis
iii. Metamerism present
iv. Closed blood vascular system
The above statements exemplify which organism?
1. Flatworm
2. Ophiura
3. Wuchereria
4. Earthworm
Subtopic: Phylum Annelida |
87%
From NCERT
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Which of the following is correct?
1. Archaeopteryx is thought to be the transitional fossil between dinosaurs and birds since, like birds Archaeopteryx had feathers and a fused collar-bone indicating the flying ability
2. Cloaca is present in Balenoptera
3. In Physalia, digestion is first extracellular and then intracellular digestion occurs
4. Both (1) and (iii)
1. Archaeopteryx is thought to be the transitional fossil between dinosaurs and birds since, like birds Archaeopteryx had feathers and a fused collar-bone indicating the flying ability
2. Cloaca is present in Balenoptera
3. In Physalia, digestion is first extracellular and then intracellular digestion occurs
4. Both (1) and (iii)
Subtopic: Study of Aves & Mammals |
80%
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Choose the correct match:
1. Branchostoma : Notochord persist through out the life
2. Ascidia : Notochord present in larva and disappears in adult
3. Doliolum : Notochord present in the larval tail only
4. More than one option is correct
1. Branchostoma : Notochord persist through out the life
2. Ascidia : Notochord present in larva and disappears in adult
3. Doliolum : Notochord present in the larval tail only
4. More than one option is correct
Subtopic: Phylum Hemichordata | General Introduction: Vertebrates & Agnatha |
82%
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Lampreys:
1. May or may not possess jaw
2. Is included in the division Agnatha where notochord is present only in the early stages
3. Possess an elongated body with gill slits for respiration
4. Are devoid of scales and possess paired fins
1. May or may not possess jaw
2. Is included in the division Agnatha where notochord is present only in the early stages
3. Possess an elongated body with gill slits for respiration
4. Are devoid of scales and possess paired fins
Subtopic: General Introduction: Vertebrates & Agnatha |
51%
From NCERT
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