Arrange the following plants according to their chronological evolution.
A. Zosterophyllum
B. Tracheophyte ancestor
C. Progymnosperms
D. Arborescent lycopods
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → B, A, C, D
(B) Tracheophyte ancestor — this comes first. The ancestors of the vascular plants (tracheophytes) are at the base of the figure, the oldest point on the time scale.
(A) Zosterophyllum — this comes second. It is an early vascular plant that branches off from the tracheophyte ancestors and leads to the lycopods.
(C) Progymnosperms — this comes third. They appear later than Zosterophyllum and lead on to the seed ferns and the gymnosperms.
(D) Arborescent lycopods — this comes last. These tree-like lycopods lie highest on the time scale, in the later periods.
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