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: