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 phases 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 |
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) |
Match the name of the animal (Column I), with one characteristic (Column II), and the phylum/class (Column III) to which it belongs:
Column I | Column II | Column III | |
1. | Ichthyophis | terrestrial | Reptilia |
2. | Limulus | body covered by chitinous exoskeleton | Pisces |
3. | Adamsia | radially symmetrical | Porifera |
4. | Petromyzon | ectoparasite | Cyclostomata |
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