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Get Answers to all your Questions
Q.141) Given below are the stages in the life cycle of pteridophytes. Arrange in correct sequence:
A. Prothallus stage
B. Meiosis in spore mother cells
C. Fertilisation
D. Formation of archegonia and antheridia in the gametophyte
E. Transfer of antherozoids to the archegonia in the presence of water
A) (1) E, D, C, B, A
B) B, A, D, C, E
C) B, D, C, A, E
D) D, E, C, A, B
Answers (1)
The life cycle of pteridophytes shows alternation of generations between the sporophytic (diploid) and gametophytic (haploid) phases. Here's the correct sequence:
B. Meiosis in spore mother cells
→ Occurs in sporangia of the sporophyte to produce haploid spores.
A. Prothallus stage
→ The spores germinate to form a haploid gametophyte, known as prothallus.
D. Formation of archegonia and antheridia in gametophyte
→ The prothallus develops male (antheridia) and female (archegonia) sex organs.
C. Fertilisation
→ Occurs when the male gametes reach and fuse with egg cells in archegonia.
E. Transfer of antherozoids to the archegonia in presence of water
→ Requires water for antherozoids (sperm) to swim and reach the egg.
Note: Though fertilisation (C) happens after transfer of antherozoids (E), the physiological event of fertilisation is considered the next crucial stage in development.
Hence, the correct sequence is option (2): B, A, D, C, E.
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