Question

Distinguish between the following pairs in one or two sentences for each

(a) RBCs and WBCs;

(b) bone and cartilage;

(c) blood and lymph;

(d) striated and unstriated muscles;

(e) tendon and ligament;

(f) axon and dendrite.

Answer 1

(a)

RBCs	WBCs
They are red in colour.	They are colourless.
Their number is 4–6 million/mm3.	Their number is 6,000–9,000 million/mm3.
The cells contain haemoglobin.	The cells lack haemoglobin.

(b)

Bone	Cartilage
They are hard and flexible.	They are flexible.
They are porous.	They are non-porous.
They contain blood vessels.	They lack blood vessels.

(c)

Blood	Lymph
It is red in colour.	It is colourless.
RBCs are present.	RBCs are absent.
It transports nutrients, hormones, and vitamins to the tissues.	It transports nutrients (oxygen and glucose) that may have been filtered out of blood capillaries back into the bloodstream.

(d)

Striated Muscles	Unstriated Muscles
They are cylindrical.	They are spindle-shaped.
They help in locomotion.	They help in the rhythmic contraction of the internal organs.

(e)

Tendon	Ligament
It is inelastic.	It is elastic.
It connects muscles to bones.	It connects two bones.
It is made up of white fibres.	It is made up of white and yellow fibres.

(f)

Axon	Dendrite
It is long and uniformly thickened.	It is a short tapering process of a neuron.
A sheath is present.	The sheath is absent.
It lacks Nissl's granules.	It contains Nissl's granules.