Q. No.A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is
(1) Eptatretus
(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. occurance of a drastic change in form during post embryonic development
4. the presence of a segmented body and parthenogenetic mode of reproduction
Which of the following represent 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 coverd with feathers; skin moist and glandular; lungs with air sacs; fore limbs form wings |
Aves |
Which of the following animals is not viviparous?
1. Flying fox (bat)
2. Elephant
3. Platypus
4. Whale
Chitin is a polysaccharide found in the exoskeleton of
(1) prawn
(2) insects
(3) crabs
(4) all of these
Buoyancy in a bony fish is maintained with the help of
(1) streamlined body
(2) paired fins
(3) swim bladder
(4) all the above
In which of the following animals the adults have pentamerous radial symmetry while their larvae are bilaterally symmetrical?
(1) Arthropods
(2) Molluscs
(3) Echinoderms
(4) Annelids
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