Answer: The pollen grain.
- A The embryo sac
- B The pollen grain
- C The nucellus tissue
- D The endosperm cell
Correct answer: B. The pollen grain
Explanation: The germinated pollen grain (with its tube and two male gametes) is the tiny male gametophyte; the embryo sac is the female gametophyte.
Plants evolved from water-dependent algae through increasingly land-adapted groups, gaining vascular tissue (Pteridophyta), then seeds (Gymnosperms), and finally fruit-enclosed seeds (Angiosperms) - each step reducing dependence on water for reproduction.
Concept context
Classification of plants from algae to angiosperms. Understanding plant diversity is essential for NEET.