Air bladder is found in :
Which one of the following features are not true for chordates?
(a) Heart is dorsal.
(b) Pharynx is perforated by gill slits.
(c) Central nervous system is ventral, solid and single.
(d) Post-anal tail is present.
(e) Notochord is present.
Choose the most appropriate answer from the option give below:
1. | (e) only | 2. | (a), (d) and (c) only |
3. | (b) and (c) only | 4. | (a) and (c) only |
Match the following columns and select the correct option :
Column I | Column II | ||
(a) | Aptenodytes | (i) | Flying fox |
(b) | Pteropus | (ii) | Angel fish |
(c) | Pterophyllum | (iii) | Lamprey |
(d) | Petromyzon | (iv) | Penguin |
Options: | (a) | (b) | (c) | (d) |
1. | (iii) | (iv) | (ii) | (i) |
2. | (iii) | (iv) | (i) | (ii) |
3. | (iv) | (i) | (ii) | (iii) |
4. | (ii) | (i) | (iv) | (iii) |
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
A marine cartilaginous fish that can produce electric current is:
1. Pristis
2. Torpedo
3. Trygon
4. Scoliodon
1. | Male frog – a copulatory pad on the first digit of the hind limb |
2. | Female cockroach – anal cerci |
3. | Male shark – claspers borne on pelvic fins |
4. | Female Ascaris – sharply curved posterior end |
1. | Chordata – possess a mouth provided with an upper and a lower jaw |
2. | Chondrichthyes – possess cartilaginous endoskeleton |
3. | Mammalia – give birth to young ones |
4. | Reptilia – possesses 3-incomplete heart with one incompletely divided ventricle. |