MCQ
Oxygen forms about $.........$ of the air in the atmosphere.
- ✓$20\%$
- B$30\%$
- C$40\%$
- D$45\%$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$(a)$ Pollen grains inside the anther
$(b)$ Gemninated pollen grain with two male gametes
$(c)$ Seed inside the fruit
$(d)$ Embryo sac inside the ovule