4:06
std 7 science chapter 1
4:59
std 7 science chapter 2
8:29
std 7 science chapter 3
8:41
std 7 science chapter 4
11:29
std 7 science chapter 5
6:13
std 7 science chapter 6
9:29
std 7 science chapter 7
7:47
std 7 science chapter 8
7:37
std 7 science chapter 9
10:51
std 7 science chapter 10
11:24
std 7 science chapter 11
10:48
std 7 science chapter 12
11:39
std 7 science chapter 13
7:36
std 7 science chapter 14
16:53
std 7 science chapter 15
7:17
std 7 science chapter 16
8:28
std 7 science chapter 17
7:59
std 7 science chapter 18
