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Question
Refer to the image given below related to the evolution of plants through different geological periods. Identify i, ii, iii and iv.
Refer to the image given below related to the evolution of plants through different geological periods. Identify i, ii, iii and iv.
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Solution
The correct option is C i-Bryophytes, ii-Seed ferns, iii-Monocots, iv-Dicots
The beginning of the Paleozoic era saw the emergence of the chlorophyte ancestors which later gave rise to photosynthesizing plants.
Bryophytes developed from the chlorophyte ancestors which can be seen in the image as a ray coming from the chlorophyte ancestors. They later flourished during the end of the Paleozoic era, and continued to flourish in the Mesozoic and Cenozoic eras. So, the blank (i) is bryophyte.
The oldest land plants with conducting tissues (xylem and phloem) originated and colonised during the Silurian period of the Paleozoic era. Later, the seed ferns evolved from the progymnosperms. Seed ferns were present during the Carboniferous and Permian periods, but are extinct today. Hence, the blank (ii) is seed ferns.
At the end of the Mesozoic era, in the Cretaceous period, the first angiosperms were seen and they were completely diversified during the Cenozoic era.
In angiosperms (flowering plants), the dicots evolved earlier during the Cretaceous period of the Mesozoic era. The monocots evolved later during the Tertiary period of the Cenozoic era. So, the blanks (iii) and (iv) are monocots (with a single cotyledon) and dicots (with two cotyledons) respectively.
Hence, after filling all the blanks, the image will look like the one given below.
The beginning of the Paleozoic era saw the emergence of the chlorophyte ancestors which later gave rise to photosynthesizing plants.
Bryophytes developed from the chlorophyte ancestors which can be seen in the image as a ray coming from the chlorophyte ancestors. They later flourished during the end of the Paleozoic era, and continued to flourish in the Mesozoic and Cenozoic eras. So, the blank (i) is bryophyte.
The oldest land plants with conducting tissues (xylem and phloem) originated and colonised during the Silurian period of the Paleozoic era. Later, the seed ferns evolved from the progymnosperms. Seed ferns were present during the Carboniferous and Permian periods, but are extinct today. Hence, the blank (ii) is seed ferns.
At the end of the Mesozoic era, in the Cretaceous period, the first angiosperms were seen and they were completely diversified during the Cenozoic era.
In angiosperms (flowering plants), the dicots evolved earlier during the Cretaceous period of the Mesozoic era. The monocots evolved later during the Tertiary period of the Cenozoic era. So, the blanks (iii) and (iv) are monocots (with a single cotyledon) and dicots (with two cotyledons) respectively.
Hence, after filling all the blanks, the image will look like the one given below.
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