Q. No.The second largest group of dueterostomes are:
1.
Echinoderms
2.
Hemichordates
3.
Chordates
4.
Arthropods
The closest relative of the vertebrates are:
1. Echinoderms
2. Lancelets
3. Tunicates
4. Hemichordates
Considering lampreys and hagfish:
| I. | Both groups have jawless mouths with horny epidermal structures that function as teeth. |
| II. | Both groups have branchial arches that are internally positioned instead of external as in jawed fishes. |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
The tunic of urochordates is composed of proteins and complex carbohydrates, and includes tunicin, which is a variety of:
| 1. | cellulose | 2. | amylopectin |
| 3. | agaropectin | 4. | alginic acid |
Totipotent cells present in the mesohyl of porifers are known as:
1. Lophocytes
2. Amoebocytes
3. Collencytes
4. Grey cells
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 |
Match the types of reptilian skulls [COLUMN I] with their corresponding diagrams in COLUMN II and select the correct answer from the codes given:
|
|
COLUMN I |
|
COLUMN II |
|
A |
Anapsid |
P |
 |
|
B |
Synapsid |
Q |
 |
|
C |
Diapsid |
R |
 |
Codes
|
A |
B |
C |
|
|
1. |
P |
Q |
R |
|
2. |
R |
Q |
P |
|
3. |
P |
R |
Q |
|
4. |
R |
P |
Q |
The diagram shows the movement of air during inhalation in birds. The maximum percentage of the inhaled air will enter into:
1. Anterior air sacs
2. Lungs
3. Posterior air sacs
4. Parabronchi
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