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Two Hours Maximum Marks: 300

21. A form of chromosomal aberration that involves the fusion of long arms of acrocentric chromosomes at the centromere is known as

(a) Reciprocal translocation (b) Isochromosome
(c) Robertsonian translocation (d) Centromeric fusion


23. Consider the following characteristics of coelomates:
1. Radial symmetry
2. Asymmetry
3. Origin of mouth
4. Embryonic cleavage pattern
5. Coelom formation

If basic differences are to be found between protostome coelomates and deuterostome coelomates, consideration of which of the above characteristics will suffice?
(a) 1, 3, 4 and 5 (b) 2, 3, 4 and 5
(c) 1, 3 and 4 (d) 5 only


24. In which among the given minor phyla is the alimentary canal U shaped?
(a) Bryozoa only
(b) Chaetognatha and Phoronida
(c) Bryozoa and Phoronida
(d) Rotifera and Gastrotricha


26. Sea lily is the stalked echinoderm of the class
(a) Articulata (b) Asterozoa
(c) Crinoidea (d) Echinozoa


27. Which one of the following annelids is phosphorescent in the dark?
(a) Aphrodite (b) Chaetopterus
(c) Syllis (d) Sabella


28. Which group of following animals possesses mesenchymal coelom?
(a) Most Protostomia (b) Deuterostomia
(c) Phoronida. (d) Nemertina


29. Consider the following anatomical structures:
1. Single dorsal tubular nerve cord
2. Notochord
3. Gill slits in pharynx
4. Brain

The outstanding characteristics which distinguish chordates from other animals are -
(a) 1 and 2 (b) 1 and 4
(c) 1, 2 and 3 (d) 2, 3 and 4


30. Which one among the following undertakes the longest migration?
(a) Arctic tern (b) Flamingo
(c) Painted stork (d) Pelican


32. In turtle, the correct sequence of bony plates, on each side of the plastron in the antero-posterior direction is

(a) Humeral - pectoral - gular - abdominal - femoral anal
(b) Gular - humeral - pectoral - abdominal - femoral anal
(c) Pectoral - abdominal - gular - anal
(d) Abdominal - gular - femoral - anal


33. In origin, the choanocytes, the flagellated cell present in the radial canal of sponges, are
(a) Ectodermal (b) Mesodermal
(c) Endodermal (d) Mesenchymal


34. When does the developing embryo of Hydra drop from the body of the parent?

(a) Soon after formation of zygote
(b) After formation of blastula
(c) After formation of gastrula
(d) Only after it has developed into young Hyndra


35. Metagenesis in Obelia signifies the
(a) Alternation of generations between free swimming diploid medusoid and diploid polypoid stage
(b) Alternation of generations between haploid gametogenetic medusa and polypoid stage
(c) Formation of medusa on gonangium 
(d) Formation of polyp by budding


36. Which one of the following phenomena occurs during reproduction in Neanthes?

(a) Endomixis (b) Epitoky
(c) Hectocotylization (d) Metagenesis


37. Consider the following statements:
Pheretima posthuma is characterized by 

1. true coelomic body cavity lined by coelomic epithelium.
2. closed circulatory system.
3. lateal hearts with valves.

Which of the statements given above are correct?
(a) I and 2 (b) 2 and 3
(c) I and 3 (d) I, 2 and 3.


38. Which of the following explain the functions of statocyst in Prawn?
(a) Locomotion and touch
(b) Smell and movement
(c) Smell and equilibrium
(d) Orientation and equilibrium


39. Madreporite, the circular, flat, calcareous plate in Asterias sp. is situated near the

(a) anus on the aboral surface
(b) mouth on the oral surface
(c) side of the arms on the 'Oral surface
(d) the junction of the arms on the aboral surface


40. Consider the following statements regarding Balanoglossus:
1. The eggs are fertilized outside .the body and the development is indirect.
2. Full grown tornaria larva has three ciliated bands, two apical plates and a pair of pigmented eye-spots.
3. Tornaria larva is a free-swimming larval stag

Which of the statements given above are correct?
(a) 1 and 2 (b) 2 and 3
(c) I and 3 (d) 1, 2 and 3



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