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Q. No.Identify the correct statements:
I:
The digestive system in Platyhelminthes has only a single opening to the outside of the body that serves as both mouth and anus, and is hence called incomplete.
II:
In open type circulation, the blood is pumped out of the heart and the cells and tissues are directly bathed in it.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Basis of Classification |
89%
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How many of the animals given in the box belong to Mollusca?
1. 4
2. 5
3. 6
4. 7
| Pila, Echinus, Pinctada, Sepia, Loligo, Cucumaria, Octopus, Limulus, Chaetopleura |
2. 5
3. 6
4. 7
Subtopic: Phylum Mollusca | Phylum Echinodermata |
59%
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How many of the given statements are correct:
1. 1
2. 2
3. 3
4. 4
| I: | Arthropods have true coelom. |
| II: | Aschelminthes have pseudocoelom. |
| III: | Platyhelminthes lack coelom. |
| IV: | A true coelom is lined on all sides by embryonic mesoderm. |
2. 2
3. 3
4. 4
Subtopic: Basis of Classification |
77%
From NCERT
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Consider the given two statements regarding Cnidarians:
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | The name cnidaria is derived from the cnidoblasts or cnidocytes that are collared flagellated cells involved in water transport through the body of Cnidarians. |
| Statement II: | Polyps are free swimming Cnidarians and Medusae are sessile Cnidarians. |
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Phylum Coelenterata |
58%
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Ctenophores:
1. Only I, II and III are correct
2. Only I, III and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
| I: | are commonly known as sea walnuts or comb jellies |
| II: | are exclusively marine, radially symmetrical, diploblastic organisms with tissue level of organisation |
| III: | use cilia for locomotion |
| IV: | reproduce only by sexual means |
2. Only I, III and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
Subtopic: Phylum Ctenophora & Platyhelminthes |
76%
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For osmoregulation and excretion, flatworms use:
| 1. | statocysts | 2. | osphradia |
| 3. | flame cells | 4. | antennal glands |
Subtopic: Phylum Ctenophora & Platyhelminthes |
94%
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How many of the given statements regarding Annelids are true?
1. 1
2. 2
3. 3
4. 4
| I: | They exhibit organ-system level of body organisation and bilateral symmetry. |
| II: | They are triploblastic, metamerically segmented and coelomate animals. |
| III: | They possess only longitudinal muscles in their body wall which help in locomotion. |
| IV: | A closed circulatory system is present. |
2. 2
3. 3
4. 4
Subtopic: Phylum Annelida |
70%
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How many of the given statements regarding arthropods in general are true?
1. 4
2. 5
3. 6
4. 7
| I: | Body of arthropods is covered by chitinous exoskeleton. |
| II: | They have jointed appendages (arthros-joint, poda-appendages). |
| III: | Circulatory system is of open type. |
| IV: | Excretion takes place through malpighian tubules in insects. |
| V: | They are mostly dioecious and fertilisation is usually internal. |
| VI: | They are mostly oviparous. |
2. 5
3. 6
4. 7
Subtopic: Phylum Arthropoda |
68%
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Radula, a tongue rasping like organ, is characteristically seen in most:
| 1. | Annelids | 2. | Mollusca |
| 3. | Round worms | 4. | Arthropods |
Subtopic: Phylum Mollusca |
92%
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How many of the given statements regarding Mollusca are true?
1. 1
2. 2
3. 3
4. 4
| I: | They are bilaterally symmetrical, triploblastic and coelomate animals. |
| II: | Body is covered by a calcareous shell and is segmented with a distinct head, muscular foot and visceral hump as metameres. |
| III: | A soft and spongy layer of skin forms a mantle over the visceral hump. |
| IV: | They are usually dioecious and oviparous with indirect development. |
2. 2
3. 3
4. 4
Subtopic: Phylum Mollusca |
57%
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