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Structural Organisation in Animals · Question 88

AIPMT 2000MCQEasy📈 Topic in 50% papers+4−1
1

What happens if bone of frog is kept in dilute hydrochloric acid?

  1. Will become flexible
  2. Will turn black
  3. Will break into pieces
  4. Will shrink

Answer

(1) Will become flexible

Solution

As per NCERT, bone has a hard and non-pliable ground substance rich in calcium salts and collagen fibres.

⇒ Dilute HCl dissolves the calcium salts (decalcification): Ca3(PO4)2 + 6HCl 3CaCl2 + 2H3PO4

⇒ Only the organic matrix (collagen fibres) is left behind.

∴ The bone becomes soft and flexible.

Answer: (1)

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2

Proteoglycan in cartilages which is part of polysaccharide is

  1. Ossein
  2. Cartilegen
  3. Chondroitin
  4. Casein
AIPMT 2000
3

Characteristic of simple epithelium is that they

  1. Continue to divide and help in organ function
  2. They are arranged indiscriminately
  3. They make a definite layer
  4. None
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4

Primary function of enteronephric nephridia of Pheretima:

  1. Excretion of nitrogenous waste
  2. Locomotion
  3. Osmoregulation
  4. Respiration
AIPMT 2000

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