Assertion: In a pivot joint, rounded or pointed bone fits into a shallow depression in another bone.

Reason: Pivot joints are present between the metacarpals and phalanges of the fingers.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

72.

During muscular contraction, which of the following events occur

(i) H-zone disappears
(ii) A band widens
(iii) I band reduces in width
(iv) Width of A band is unaffected
(v) M line and Z line come closer

• (i), (iii), (iv) and (v)

• (i), (i) and (v)

• (ii), (iv) and (v)

• (i), (ii) and (iii)

Which of the following is true for the labelled parts in the figure below?

• A - Z- line - located at centre of I - band

• B - Thin filament - occurs in A- band only

• C - Thick filament - confined to I- band

• D - H- zone - located at centre of M - Line

Which of the following is correct about the given figure?

• The length ofthe thick and thin myofilaments has changed.

• Length of both anisotropic and isotropic band has changed.

• The myosin cross-bridges move on the surface of actin and the thin and thick myofilaments slide past each other.

• Length of the sarcomere remains same.

What is diapedesis?

• A kind of amoeboid movement.

• The process of filtration of urea in kidney.

• A type of locomotion found in Hydra

• Migration of WBCs into the tissue spaces from blood capillaries

Which one of the following is a sesamoid bone?

• Pelvis

• Patella

• Pterygoid

• Pectoral girdle

Skeletal muscles appear striated due to presence of two characteristic proteins in alternating dark and light bands. Which of the following is a correct match of the protein with its light refractive property and colour

• Protien	Colour	Property
  Myosin	Light	Anisotropic

• Actin

  Dark

  Anisotropic

• Myosin

  Dark

  Isotropic

• Actin

  Light

  Isotropic

The shoulder blade is made of

• clavicle

• humerus

• ilium

• scapula

A cricket player is fast chasing a ball in the field. Which one of the following groups of bones are directly contributing in this movement

• Femur, malleus, tibia, metatarsals

• Pelvis, ulna, patella, tarsals

• Sternum, femur, tibia, fibula

• Tarsals, femur, metatarsals, tibia

Given diagram shows bone of the left human hindlimb as seen from front. It has certain mistakes in labeling. Two of the wrongly labelled bones are

• tibia and tarsals

• femur and fibula

• fibula and phalanges

• tarsals and femur