Arrange the given evolutionary stages of plants in correct chronological sequence.
(A) Chlorophyte ancestors
(B) Rhynia type plant
(C) Tracheophyte ancestors
(D) Psilophyton
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A), (C), (B), (D)
(A) Chlorophyte ancestors — first in the sequence. These were green-alga-like ancestors that lived in water. All land plants arose from this line.
(C) Tracheophyte ancestors — second. Tracheophytes are plants with vascular tissue (xylem and phloem). Their ancestors were the first step from the algal line towards the vascular plants.
(B) Rhynia type plant — third. Rhynia-type plants were simple, early vascular land plants of the Silurian period.
(D) Psilophyton — last. Psilophyton comes above the Rhynia-type plants in the chart. Many later groups, such as the ferns, horsetails and conifers, branch off from this point.
In the chart below, the groups appear from the bottom (older) to the top (newer) in this very order.
NCERT Extract:
