Step 1: Pusa Hybrid-4, released by ICAR-IARI New Delhi, is indeed the first gynoecious line based hybrid developed in bitter gourd, so Statement (I) is correct.
Step 2: A gynoecious plant produces almost only female flowers, so a normal cucurbit male-heavy ratio like 25:1 does not describe it. In gynoecious lines the ratio is heavily skewed towards female flowers, not male flowers, so Statement (II) is incorrect.
Step 3: Hence Statement (I) is correct but Statement (II) is incorrect.