MCQ
Penicillin is the first antibiotic. It was discovered by
- ✓Alexander Flemming $:\, 1928$
- BAlexander Flemming $:\, 1930$
- CS Waksman $:\, 1928$
- DS Waksman $: \,1930$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Reason : Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on $X-$ chromosome and some on $Y-$ chromosome.