Oviparous mammals are:
1. marsupials
2. placental mammals
3. monotremes
4. None
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 |
| Assertion : | Claspers of cartilage fishes are analogous to penis of human male. |
| Reason : | Both act as copulatory organs and transfer the sperms into female. |
Which of the following characteristic features always hold true for the corresponding group of animals?
| (a) | Viviparous | (1) | Mammalia |
| (b) | Possess a mouth with an upper and a lower jaw | (2) | Chordata |
| (c) | 3- chambered heart with one incompletely divided ventricle | (3) | Reptilia |
| (d) | Cartilaginous - Endoskeleton | (4) | Chondrichthyes |
1. a
2. b
3. c
4. d
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. |
Which of the following characteristics is mainly responsible for the diversification of insects on land: