Skeletal System

Q.

Notochord is present in

1. All chordates

2. All vertebrates

3. Few chordates

4. Few vertebrates

Q. Explain the term thecodont and diphyodont.

Q.

Intercalated discs are the characteristics of which of the following?

1. Involuntary muscles.

2. Voluntary muscles.

3. Cardiac muscles.

4. Skeletal muscles.

Q.

If thorax is injured and the pleura damaged, the air enters the pleural cavity and the lungs collapse. This condition is known as __.

Q.

Fishes with lobed and muscular paired fins belong a class termed _____.

1. Osteichthyes

2. Chondrichthyes

3. Sarcopterygii

4. Actinopterygii

Q.

How many bones are present in the structure of skeleton system of humans?

1. 206

2. 210

3. 308

4. 146

Q.

The largest bone in the human body is the

1. Femur

2. Stapes

3. Humerus

4. Patella

Q. Grasshoppers, cockroaches and houseflies breath by means of

1. Spiracles
2. Trachea
3. Cutaneous method
4. Bucco-pharyngeal cavity

Q.

Match the items of column I with those of column II:

Column I		Column II
(a)	Ammonotelism	(i)	Birds
(b)	Bowman’s capsule	(ii)	Water reabsorption
(c)	Micturition	(iii)	Bony fish
(d)	Uricotelism	(iv)	Urinary bladder
(d)	ADH	(v)	Renal tubule

Q.

Why I^st, II^nd and VII^th vertebrae are called atypical cervical vertebrae?

Q.

Name the Contractile Proteins.