Question

Differentiate between the following pairs.
(a) tendon and ligament
(b) locomotion in an earthworm and a snake
(c) organ and organ system
(d) voluntary and involuntary muscles

Answer 1

(a)

Tendon	Ligament
Fibre that attaches muscles to bones is called tendon.	Tough elastic fibre by which bones are joined is called ligament.

(b)

Locomotion in earthworm	Locomotion in snake
Earthworms move by contraction and expansion of muscles.	The movement of snakes is called slithering.
They have bristle-like projections beneath their body for a good grip.	They do not have any projections or limbs.

(c)

Organ	Organ system
Organ is made up of different types of tissues that work together for a particular function, e.g., heart	Organ system is a group of organs that work together like a circulatory system. e.g., circulatory system

(d)

Voluntary muscles	Involuntary muscles
Voluntary muscles are those whose movement can be controlled by us such as that of arms and legs.	Involuntary muscles are those whose movements are not controlled by us such as that of heart.