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The blood calcium level is lowered by the deficiency of 

  • parathormone

  • thyroxine

  • calcitonin

  • Both (a) and (c)

Which one of the following has an open circulatory system?

  • Pheretima

  • Periplaneta

  • Hirudinaria

  • Octopus

Which one of the following animals has two separate circulatory pathways?

  • Frog

  • Lizard

  • Whale

  • Shark

Which one of the follwing mammalian cells is not capable of metabolising glucose to carbon-dioxide aerobically?

  • White blood cells

  • Unstriated muscle cells

  • Liver cells

  • Red blood cells

A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offsprings?

  • A, B and AB only

  • A, B, AB and O

  • O only

  • A and B only

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