- 1(current)
Q. No.Match the following group of organisms with their respective distinctive characteristics and select the correct option :
| Organisms | Characteristics | ||
| (a) | Platyhelminthes | (i) | Cylindrical body with no segmentation |
| (b) | Echinoderms | (ii) | Warm blooded animals with direct development |
| (c) | Hemichordates | (iii) | Bilateral symmetry with incomplete digestive system |
| (d) | Aves | (iv) | Radial symmetry with indirect development |
| (a) | (b) | (c) | (d) | |
| 1. | (iii) | (iv) | (i) | (ii) |
| 2. | (ii) | (iii) | (iv) | (i) |
| 3. | (iv) | (i) | (ii) | (iii) |
| 4. | (i) | (ii) | (iii) | (iv) |
Subtopic: Phylum Ctenophora | Phylum Echinodermata | Phylum Hemichordata | Study of Aves & Mammals |
85%
From NCERT
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Consider the given two statements:
| Assertion (A): | Hemichordata is a sub-phylum under phylum Chordata. |
| Reason (R): | Notochord of chordates and stomochord of hemichordates are homologous. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True; (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Phylum Hemichordata | Phylum Chordata |
69%
From NCERT
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Study the Assertion statement followed by the Reason statement given below:
| Assertion (A): | Hemichordata was earlier considered as a sub-phylum under phylum Chordata but now it is placed as a separate phylum under non-chordata. |
| Reason (R): | Stomochord of hemichordates and notochord of chordates are homologous structures. |
| 1. | (A) is True but (R) is False. |
| 2. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 3. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 4. | (A) is False but (R) is True. |
Subtopic: Phylum Hemichordata |
From NCERT
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How many of the given statements are true?
1. 1
2. 2
3. 3
4. 4
| I. | Hemichordates have a rudimentary structure in the collar region called stomochord, a structure similar to notochord. |
| II. | Chordates possess a post anal tail and a closed circulatory system. |
| III. | In Cephalochordata, notochord is present only in larval tail. |
| IV. | In Urochordata, notochord extends from head to tail region and is persistent throughout their life. |
1. 1
2. 2
3. 3
4. 4
Subtopic: Phylum Hemichordata | Phylum Chordata |
75%
From NCERT
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Consider the two statements:
| Assertion (A): | Hemichordates are chordates. |
| Reason (R): | Notochord and stomochord are homologous. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 3. | (A) is True, (R) is False |
| 4. | Both (A) and (R) are false |
Subtopic: Phylum Hemichordata |
90%
From NCERT
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