Q. No.A jawless fish, which lays eggs in freshwater and whose ammocoetes larvae after metamorphosis return to the ocean is?
1. Eptratretus
2. Myxine
3. Neomyxine
4. Petromyzon
Metagenesis refers to?
| 1. | The presence of different morphic forms |
| 2. | Alternation of generation between asexual and sexual phrases of an organism |
| 3. | Occurrence of a drastic change in the form during post-embryonic development |
| 4. | Presence of a segmented body and parthenogenic mode of reproduction |
Body having meshwork of cells, internal cavities lined with food filtering flagellated Cells and indirect development is the characteristics of phylum?
1. Coelenterata
2. Porifera
3. Mollusca
4. Protozoa
Which of the following characteristics is mainly responsible for the diversification of insects on land:
2. Bilateral symmetry
3. Exoskeleton
4. Eyes
Which of the following represents the correct combination without any exception?
| Characteristic | Class |
| (a) Mammary gland; hair on body; pinnae; two pairs of limbs | Mammalia |
| (b) Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord | Chondrichthyes |
| (c) Sucking and circular mouth; jaws absent; integument without scales; paired appendages | Cyclostomata |
| (d) Body covered with feathers; skin moist and glandular; lungs with air sacs; forelimbs from wings | Aves |
| 1. | a | 2. | b |
| 3. | c | 4. | d |
2. Elephant
3. Platypus
4. Whale
Select the Taxon mentioned that represents both marine and freshwater species:
1. Echinoderms
2. Ctenophora
3. Cephalochordata
4. Cnidaria
Planaria possess a high capacity of:
1. metamorphosis
2. regeneration
3. alternation of generation
4. bioluminescence
A marine cartilaginous fish that can produce electric current is:
1. Pristis
2. Torpedo
3. Trygon
4. Scoliodon
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