1:06:43

Principle of inheritance and variation

1:58:38

Magnetism and matter-2

46:52

Chemical Properties of Metals and Nonmetals-1

50:38

Brain-1

1:09:37

Defects of Vision

1:07:46

Magnetism and matter

1:35:00

Human Eye

36:22

Human Eye (मानव नेत्र )-2