Statement A: | The most unique mammalian characteristic is the presence of milk-producing mammary glands. |
Statement B: | Mammals have one pair of limbs, adapted for walking, running, climbing, burrowing swimming, or flying. |
Statement (A): | Osteichthyes includes both marine and freshwater fishes with a bony endoskeleton. |
Statement (B): | Their body is streamlined and their mouth is ventral in position. |
a. | Phylum vertebrata is divided into two superclasses - Pisces and Tetrapoda. |
b. | Superclass Pisces includes cyclostomes, cartilaginous and bony fishes. |
c. | In bony fishes, air bladder is present which regulates buoyancy. |
d. | Body of all amphibians is divisible into head neck and trunk. |
e. | Both fishes and amphibians are poikilothermous animals. |
1. | a, b, c, d | 2. | a, b, c, d, e |
3. | a, b, d | 4. | c, d, e |
Column I | Column II | ||
a. | Asterias | (i) | Notochord in larval tail |
b. | Balanoglossus | (ii) | Spiny body |
c. | Ascidia | (iii) | Cloaca present |
d. | Hyla | (iv) | Worm-like marine animal |
Column-I | Column-II | ||
a. | Three-chambered heart with one incompletely divided ventricle | (i) | Myxine |
b. | Jawless vertebrate with a cartilaginous vertebral column | (ii) | Chaetopleura |
c. | Soft, unsegmented body and has a structure that helps in both respiration and excretion | (iii) | Calotes |
d. | Ventral mouth, gills without operculum, and skin with placoid scales | (iv) | Scoliodon |
1. | One | 2. | Two |
3. | Three | 4. | Four |
(a) | All vertebrates are chordates but all chordates are not vertebrates |
(b) | All vertebrates have paired appendages which may be fins or limbs |
(c) | All vertebrates bear jaw |
(d) | All aquatic animals which bear fins are placed in superclass Pisces |
a | b | c | d | |
1. | T | F | F | F |
2. | T | T | F | F |
3. | T | F | F | T |
4. | T | F | T | T |
Assertion (A): | Platyhelminthes are commonly known as flatworms |
Reason (R): | They have a dorso-ventrally flattened body |
1. | Both (A) and (R) are true and (R) is the correct explanation for (A) |
2. | Both (A) and (R) are true but (R) is not the correct explanation for (A) |
3. | (A) is true, (R) is false |
4. | (R) is true (A)is false |
Column-I | Column-II | ||
a. | Planaria | (i) | Indirect development |
b. | Ctenoplana | (ii) | Gills are covered by an operculum on each side |
c. | Petromyzon | (iii) | Possess high regeneration capacity |
d. | Exocoetus | (iv) | Migrates for spawning to freshwater |
(a) | Statocysts are balancing organs present in aquatic insects such as prawn |
(b) | Mollusca is the 2nd largest phylum of animal kingdom which includes Limulus |
(c) | Insects are bilaterally symmetrical, triploblastic, segmented and coelomate animals |
(d) | Molluscs have segmented body with a distinct head, muscular foot and visceral hump |
(e) | In all echinoderms, digestive system is complete with mouth on the dorsal side and anus on the ventral side |