Structural Organisation in Animals

NEET Biology · 93 questions · Page 7 of 10 · Click an option or "Show Solution" to reveal answer

Q61

Which is the true description about an animal concerned?

A Frog - Body divisible into three regions-head, neck and trunk

B Rat - Left kidney is slightly higher in position than the right one

C Earthworm - The alimentary canal consists of a sequence of pharynx, oesophagus, stomach, gizzard and intestine

D Cockroach - 10 pairs of spiracles (2 pairs on thorax and 8 pairs on abdomen)

Correct Answer

Option D

Solution

There are 10 pairs of spiracles in cockroach: 2 thoracic pairs and 8 abdominal pairs.

Q62

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

A coelomic fluid

B gut peristalsis

C blood

D setae

Correct Answer

Option A

Solution

The coelom filled with alkaline milky coelomic fluid makes the anterior end turgid, acting as hydraulic skeleton.

Q63

Which pair of structures distinguishes a nerve cell from other types of cell?

A Perikaryon and dendrites

B Nucleus and mitochondria

C Flagellum and medullary sheath

D Vacuoles and fibres

Correct Answer

Option A

Solution

Perikaryon (cytoplasm surrounding nucleus) and dendrites (short tapering branched processes) are unique to nerve cells.

Q64

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

A Thrombocytes

B Tendon

C Hyaline cartilage

D Ciliated epithelium

Correct Answer

Option D

Solution

Ciliated epithelium has cells closely packed with numerous intercellular junctions.

Q65

Earthworms are

A Uricotelic when plenty of water is available

B Ammonotelic when plenty of water is available

C Ureotelic when plenty of water is available

D Uricotelic under conditions of water scarcity

Correct Answer

Option B

Solution

Earthworm is ammonotelic when water is available and ureotelic on land.

Q66

Areolar connective tissue joins

A Bones with muscles

B Bones with bones

C Fat body with muscles

D Integument with muscles

Correct Answer

Option D

Solution

Areolar connective tissue joins skin epithelia with muscles, nerves and blood vessels.

Q67

Mast cells secrete

A Histamine

B Hippurin

C Haemoglobin

D Myoglobin

Correct Answer

Option A

Solution

Mast cells are granulated wandering cells in connective tissue. Their granules contain histamine, a vasodilator.

Q68

Which of the cells are least likely to be replaced by new cells after injury?

A Malpighian layer of the skin

B Osteocytes

C Neurons

D Liver cells

Correct Answer

Option C

Solution

Neurons are specialised to conduct electrochemical currents and do not have the capability to divide.

Q69

Mast cells of connective tissue contain

A Heparin and calcitonin

B Heparin and histamine

C Vasopressin and relaxin

D Serotonin and melanin

Correct Answer

Option B

Solution

Mast cells contain histamine (vasodilator) and heparin (anticoagulant).

They participate in body defence and allergic reactions.

Q70

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

A Stratified epithelium

B Myelinated nerve fibres

C Striated muscle

D Areolar tissue

Correct Answer

Option D

Solution

Areolar tissue has more intercellular space, so largest quantity of extracellular material is present.

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