Differentiate between the following pairs on the basis of what is mentioned within brackets:

(i) Difference between Human skin cell and Human ovum (number of chromosomes)

Human skin cell	Human ovum
Human skin cell contains 46 chromosomes	Human ovum contains 23 chromosomes.

(ii) Difference between Sperm duct and fallopian tube (function)

Sperm duct	Fallopian tube
Transports sperms from testis to urethra	Transports Ovum into uterus. Fertilization takes place here and then zygote travels down into uterus via the Fallopian tubes (Oviduct)

(iii) Difference between Red Cross and WHO (one activity)

Red Cross	WHO
It procures and supplies blood for the victims of war and other calamities.	It promotes and supports projects for research on diseases.

(iv) Difference between Rod cells and Cone cells (pigment)

Rod cells	Cone cells
Rhodopsin / Visual Purple	Iodopsin / Visual Violet

(v) Difference between LUBB and DUP (names of the valves whose closure produce the sound)

LUBB	DUP
Bicuspid and tricuspid valves	Semilunar valves.