: I can't do more than 10 - 15 repetitions for biceps I have been going to the gym since last seven years. My friends at the gym do more than 15 repetitions per set. I am not comparing with them, but I don't understand why

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It sounds like you've been focusing too much on high repetitions. 15-20 is an extremely high rep range for weightlifting. High reps don't increase strength. You need to do much more weight at lower reps to increase strength. After doing a low rep routine for several months, you should be able to have enough strength to do more than 15 bicep curls.

Here are some useful tips on rep ranges from Bodybuilding.com. The 1-6 rep range is for strength increase, but won't subtantially increase muscle size. I think you'll want to stick to this range to strenghthen your biceps.

Trained Olympic lifters, for example,
were shown over a two-year period to
have significant strength increases
with barely noticeable increases in
muscle mass (Hakkinen et al, 1988). I
had a similar experience when I used
AST's Max-OT principals. My strength
went up like crazy, but I gained very
little size.

Obviously, traditional strength
training with low volume and low sets
(1-6 reps, 3 or less sets) is not the
best approach [for size gains]. Strength training does
cause hypertrophy (Hakkinen et al,
1985), but it won't cause maximum
hypertrophy.

Also, your diet is completely wrong:

I eat 2 chapatis with some vegetables
in the breakfast, then at the lunch ,
at evening break fast and at dinner.

Firstly, chapatis (a wheat flatbread), has some protein, but not nearly as much protein weightlifters need.
Most vegetables have negligible protein. There are only a few vegetables with good protein, such as quinoa. The easiest way to get protein is from animal meat or protein powders.
You shouldn't be eating the same things for three meals a day. Most natural foods do not have the complete essential amino acid profile (the amino acids your body cannot synthesize). You need variety so that the amino acid profile of one meal can be grouped with that of another meal to fully utilize the protein.
Weightlifters should not be eating only 3 meals a day. You need to split your food into 5-6 smaller meals spread evenly throughout the day so you always have a positive nitrogen balance.