Structural Organisation in Animals

The cell junctions called tight, adhering and gap junctions are found in :

1. Connective tissue
2. Neural tissue
3. Epithelial tissue
4. Muscular tissue

The kind of tissue that forms the supportive structure in our pinna (external ears) is also found in -

1. vertebrae
2. tip of the nose
3. ear ossicles
4. nails

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

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)

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

Bowman's glands are found in

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

Areolar connective tissue joins-

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

Mast cells secrete-

1. Histamine
2. Hippurin
3. Haemoglobin
4. Myoglobin

Mast cells of connective tissue contain -

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

Ommatidia serve the purpose of photoreception in

1. cockroach
2. frog
3. humans
4. sunflower.