41.  Larve of .......... after metamorphosis return to the ocean.

A. scoliodon

B. shark

C. lamprcy

D. catla

Answer : Option C

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42.  Chondrichthyes is characterized by .........

A. ventral mouth

B. placoid scale

C. ctenoid scale and ventral mouth

D. placoid scale and ventral mouth

Answer : Option D

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43.  Air bladder is absent in _______

A. Dog fish

B. catla

C. Pohu

D. flying fish

Answer : Option A

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44.  Sea horse is ________

A. a bird

B. a mammul

C. an amphibian

D. a fish

Answer : Option D

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45.  Terminal mouth occur in

A. catla

B. Electric ray

C. shark

D. sting ray

Answer : Option A

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46.  Which of the following is oviparous fish ?

A. shark

B. sea horse

C. catla

D. all of these

Answer : Option D

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47.  The scaleless vertebrate is

A. snake

B. Rohu

C. shark

D. rat

Answer : Option D

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48.  They are cold-blooded animal

A. horse

B. sea-horse

C. bat

D. crane

Answer : Option B

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49.  Amphibia means .........

A. A = amphi = dual , B = bios = life

B. A = amphi = water , B = bios = life

C. A = Amphi = single , B = bios = life

D. A = amphi = land , B = bios = life

Answer : Option A

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50.  The limbless amphibians is

A. Tree fog

B. Toad

C. Pana

D. Ichthyophis

Answer : Option D

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