Which of the following statement/s about chondrichthyes are incorrect?
1) Notochord is persistent throughout life
2) Endoskeleton is made up of bones
3) Operculum present
4) Skin is covered by placoid scales
(1) All of the above
(2) None of the above
(3) 1 and 4 are incorrect
(4) 2 and 3 are incorrect
Which of the following animal has a bony endoskeleton?
(1) Exocoetus
(2) Clarias
(3) Pristis
(4) both (1) and (2)
In which of these examples are the members exclusively chondrichthyes
(1) Scoliodon, Pristis, Labeo, Betta
(2) Scoliodon, Pristis, Betta, Trygon
(3) Scoliodon, Trygon, Pristis, Carcharodon
(4) Scoliodon, labeo, Carcharodon, Pristis
Dry, cornified skin along with epidermal scales or scutes is found in
(1) Tortoise
(2) Hyla
(3) Bufo
(4) All of the above
The common name of Calotes versicolor is
1. Garden lizard
2. Tree lizard
3. Wall lizard
4. Monitor lizard
Given below are two statements:
| Assertion (A): | Starfish moves through crawling. |
| Reason (R): | Starfish utilise a flow of water over the surface, for movement. |
| 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. |
Assertion : Claspers of cartilage fishes are analogous to penis of human male.
Reason : Both act as copulatory organs and transfer the sperms into female.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Identify the incorrectly matched class of vertebrates with the features given :
1. Fishes - Jaws and paired appendages (except Agnathans); Single loop circulation; Gills
2. Amphibians - Legs ( except in Caecilian); three chambered heart; no pulmonary veins
3. Reptiles - Amniotic egg; dry skin, thoracic breathing
4. Birds - Feathers; flight skeleton; endothermy
A high regeneration capacity is present in
(1) Planaria
(2) Ancylostoma
(3) Sepia
(4) Sea cucumber
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