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Structural Organisation in Animals · Question 75

AIPMT 2008MCQEasy📈 Topic in 0% papers+4−1
1

Earthworms have no skeleton but during burrowing the anterior end becomes turgid and acts as a hydraulic skeleton. It is due to:

  1. coelomic fluid
  2. gut peristalsis
  3. blood
  4. setae

Answer

(1) coelomic fluid

Solution

⇒ The earthworm is a coelomate animal; its true coelom, divided by septa into segmental compartments, is filled with coelomic fluid.

⇒ During burrowing, contraction of the body-wall muscles presses on this incompressible coelomic fluid, making the anterior end turgid and rigid, so it works as a hydraulic skeleton.

⇒ Setae only help in gripping the soil, and blood and gut peristalsis play no part in this.

Answer: (1)

AIPMT 2008

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2

Which one of the following is the true description about an animal concerned?

  1. Frog — Body divisible into three regions-head, neck and trunk
  2. Rat — Left kidney is slightly higher in position than the right one
  3. Earthworm — The alimentary canal consists of a sequence of pharynx, oesophagus, stomach, gizzard and intestine
  4. Cockroach — 10 pairs of spiracles (2 pairs on thorax and 8 pairs on abdomen)
AIPMT 2008
3

In which one of the following preparations are you likely to come across cell junctions most frequently?

  1. Thrombocytes
  2. Tendon
  3. Hyaline cartilage
  4. Ciliated epithelium
AIPMT 2007
4

Bowman's glands are found in

  1. juxtamedullary nephrons
  2. olfactory epithelium
  3. external auditory canal
  4. cortical nephrons only
AIPMT 2006
5

Areolar connective tissue joins-

  1. Bones with muscles
  2. Bones with bones
  3. Fat body with muscles
  4. Integument with muscles
AIPMT 2006
6

Mast cells secrete-

  1. Histamine
  2. Hippurin
  3. Haemoglobin
  4. Myoglobin
AIPMT 2006
7

Mast cells of connective tissue contain -

  1. Heparin and calcitonin
  2. Heparin and histamine
  3. Vasopressin and relaxin
  4. Serotonin and melanin
AIPMT 2004
8

Ommatidia serve the purpose of photoreception in

  1. cockroach
  2. frog
  3. humans
  4. sunflower.
AIPMT 2003
9

Which one of the following contains the largest quantity of extracellular material ?

  1. Stratified epithelium
  2. Myelinated nerve fibres
  3. Striated muscle
  4. Areolar tissue
AIPMT 2003
10

Which cartilage is present at the end of long bones?

  1. Calcified cartilage
  2. Hyaline cartilage
  3. Elastic cartilage
  4. Fibrous cartilage
AIPMT 2002
11

Melanin protects from:

  1. Infrared rays
  2. U.V. rays
  3. Visible rays
  4. X-rays
AIPMT 2002

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