Looking for classes? Ksquare Career Institute, Bengaluru →
Given below are the stages in the life cycle of pteridophytes. Arrange the following stages in the correct sequence.
A. Prothallus stage
B. Meiosis in spore mother cells
C. Fertilisation
D. Formation of archegonia and antheridia in gametophyte.
E. Transfer of antherozoids to the archegonia in presence of water.
Choose the correct answer from the options given below:
A. Prothallus stage
B. Meiosis in spore mother cells
C. Fertilisation
D. Formation of archegonia and antheridia in gametophyte.
E. Transfer of antherozoids to the archegonia in presence of water.
Choose the correct answer from the options given below:
A
B, A, D, E, C
B
B, A, E, C, D
C
D, E, C, A, B
D
E, D, C, B, A
Explanation
Sequence: Meiosis in SMC (B) -> Prothallus (A) -> Sex organs form (D) -> Flagellated transfer (E) -> Fertilization (C).
Detailed Solution
In pteridophytes: Spore mother cells in sporangia undergo meiosis (B) to form haploid spores. Spores germinate into a prothallus gametophyte (A). The gametophyte develops antheridia and archegonia (D). Flagellated antherozoids swim through water to archegonia (E), leading to fertilization (C).