1. | 3 | 2. | 4 |
3. | 5 | 4. | 6 |
I: | They are marine but migrate for spawning to fresh water. |
II: | After spawning, within a few days, they die. |
III: | Their larvae, after metamorphosis, return to the ocean. |
1. | are marine animals and have cartilaginous endoskeleton |
2. | have a mouth located dorsally |
3. | have teeth that are modified cycloid or ctenoid scales directed backwardly |
4. | have the capacity to regulate their body temperature |
1. | In males, pelvic fins bear claspers |
2. | Some of them have electric organs [Torpedo] |
3. | None of them is viviparous |
4. | Some possess poison sting [Trygon] |
I: | They have four pairs of gills which are covered by an operculum on each side. |
II: | Due to the absence of air bladder, they have to swim constantly to avoid sinking. |
III: | Skin is covered with placoid scales. |
IV: | Mouth is mostly terminal. |
1. | Only II | 2. | Only II and III |
3. | Only I and IV | 4. | Only IV |
1. | Most have two pairs of limbs and tail is present in some. |
2. | Alimentary canal, urinary and reproductive tracts open into a common chamber called cloaca which opens to the exterior. |
3. | Respiration is by gills, lungs and through skin. |
4. | The heart is two chambered with one atrium and one ventricle. |
I: | Body is covered by dry and cornified skin, dermal scales or scutes. |
II: | External ear is not present and tympanum represents the ear. |
III: | Scales are shed as skin cast in all members. |
IV: | Fertilization is internal and development is direct. |
1. | Only II is correct | 2. | Only II and IV are correct |
3. | All are correct | 4. | Only I and II are incorrect |
1. | Crocodile | 2. | Wall lizard |
3. | Turtle | 4. | Tortoise |
In birds:
a: | the characteristic feature is the presence of feathers. |
b: | forelimbs are modified into wings. |
c: | flight is present in all members. |
d: | hind limbs do not have scales. |
1. Only (a) and (d) are incorrect
2. Only (c) and (d) are correct
3. (a), (b) and (c) are correct
4. Only (a) and (b) are correct
Birds are not characterized by:
1. a fully ossified endoskeleton
2. pneumatic long bones
3. absence of crop and gizzard in the digestive tract
4. a dry skin without glands except the oil gland