Home
Class 11
BIOLOGY
Assertion. Skull is discondylic in man. ...

Assertion. Skull is discondylic in man.
Reason. A pair of occipital condyles located anterolateral to formen movably articulate with the atlas vertebra.

A

If both A and R are true and R is the correct explanation of A .

B

If both A and R are true but R is not the correct explanation of A.

C

If A is true but R is false.

D

If both A and R are false.

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

Read the following statements and find out the incorrect (a) Hyoid is present at the roof of the buccal cavity and included in the skull (b) The skull region anieulates with the superior region of the vertebral column with the help of two occipital condyles (c) First vertebra is the axis which articulates with the occipital condyles (d) Stemum is a hat bone on the dorsal midline of therox. Vertebral column is dorsally placed Appendicular site

Assertion: Human has dicondylic skull. Reason: Skull articulates with superios region of the vertebral column with the help of two occipital condyles.

Read the given statements and select the correct option. Statement 1 : Articulation between the occipital condyles and the atlas vertebra forms a hinge joint. Statement 2 : It permits the head to move in one plane only, i.e., nodding of head.

Fill in the blanks : (i) Type of cartilage present in pinna and tip of the nose is called ………. Cartilage and type of cartilage present in intervertebral discs is called……….. Cartilage. (ii) The mineral matter present in bone is mainly……… . It gives bone its considerable ability to withstand....... . (iii) Tendons join ......... to ......... whereas ligaments join ......... to.......... . (iv) Human skeleton is divided into two main parts i.e................. and.......... . (v) Number of cervical vertebrae present in the neck of man and camel are ........... and .......... respectivey. (vi) There are 12 pairs of ribs which movably articulate with the thoracic vertebrae at the back and unite in front with the sternum to form ........... . The upper ............. pairs of ribs are attached in front directly to the sternum and are called ............ ribs. The next......... pairs of ribs are joined to the ribs above each and are termed ............. ribs. The remaining pairs are free in front and are called ........... ribs.

[A] : In frog skull is dicondyiic. [R]: Skull articulates with the atlas vertebra by two occipital condyles one on each exoccipital.

Assertion : - Axis vertebrae help in rotation of neck. Reason :- Centrum is absent in Atlas vertebrae

Assertion :- The skull region articulates with the superior regionof the vertebral column with the help of two occipital condyles. Reason : The number of cervical vertebrae are seven in almost all mammals including human beings.

Assertion:The 8th , 9th and 10th pairs of ribs are false ribs Reason:They are attached to the lumbar vertebrae dorsally

Assertion : Pairing and separation of pair of chromosomes would lead to segregation of a pair of factors they carried Reason : Two alleles of a gene pair are located on similar sites on non-homologous chromosomes