- 1(current)
Q. No.The animals belonging to all the following groups are exclusively marine except:
| 1. | Ctenophora | 2. | Porifera |
| 3. | Protochordata | 4. | Echinodermata |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
Which of the following represents the correct combination without any exception?
| Characteristic | Class | |
| 1. | Mammary gland; hair on body; pinnae; two pairs of limbs | Mammalia |
| 2. | Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord | Chondrichthyes |
| 3. | Sucking and circular mouth; jaws absent; integument without scales; paired appendages | Cyclostomata |
| 4. | Body covered with feathers; skin moist and glandular; lungs with air sacs; fore limbs from wings | Aves |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
Which of the following statements regarding Chondrichthyes may not be true for majority of members of the class?
1. Notochord is persistent throughout life.
2. Skin has placoid scales.
3. Fertilization is internal.
4. Mouth is located ventrally.
The second intermediate host required by Clonorchis sinensis is:
| 1. | A snail | 2. | A fish |
| 3. | A crustacean | 4. | A coral |
Identify the incorrect comparison between a typical cartilaginous and a bony fish:
|
|
Characteristic |
Cartilaginous fish |
Bony fish |
|
1. |
Usual shape |
Dorso-ventrally flattened |
Bilaterally flattened |
|
2. |
Exoskeleton |
Separate dermal placoid scales |
Overlapping dermal cosmoid, ganoid, cycloid or ctenoid scales |
|
3. |
Intromittent organ |
Males use pelvic fins as claspers |
Do not use claspers |
|
4. |
Mouth |
Variable shape and size at the tip or terminal part of the head |
Large, crescent shaped on the ventral side of the head |
Identify the incorrect comparison between a typical cartilaginous and a bony fish:
|
|
Characteristic |
Cartilaginous fish |
Bony fish |
|
1. |
Gill openings |
Not protected by an operculum |
Protected by an operculum |
|
2. |
Fertilization |
Internal |
Usually external |
|
3. |
Retina |
Lacks cones |
Has cones |
|
4. |
Conus arteriosus |
Absent |
Present |
- 1(current)
Q. No.
© 2024 GoodEd Technologies Pvt. Ltd.