This set of Biology Online Test for MBBS Entrance Exams focuses on “A Brief Account of Evolution of Plants”.
1. Blue-green algae originated about ______ years ago.
a) 1.5 billion
b) 2.5 billion
c) 3.5 billion
d) 4 billion
Explanation: Prokaryotic form of life was formed. Also, blue-green algae originated about 1.5 billion years ago. They evolved during the Archaeozoic era.
2. What occurred during the Cambrian period of plant evolution?
a) Single-celled bacteria evolved in the sea
b) Blue-green algae evolved in the sea
c) Marine multicellular algae evolved
d) Unicellular plants evolved
Explanation: Marine bacteria evolved. Along with this, colonial multicellular filamentous algae evolved in oceans during the Cambrian period. This occurred about seven crore years ago.
3. Marine plants were abundant during which period?
Explanation: Marine plants were abundant during the Ordovician period. Plants also reached fresh water during this period. It occurred about 6 to 7 crore years ago during the Palaeozoic era.
4. Bryophytes belonged to _______ ancestral chain.
Explanation: Bryophytes belonged to chlorophyte ancestors. Bryophytes originated about 6.5 crore years ago. Bryophytes flourished during the tertiary period.
5. Which of the following does not belong to tracheophyte ancestors?
a) Herbaceous lycopods
b) Arborescent lycopods
Explanation: Herbaceous lycopods, arborescent lycopods, and zosterophyllum belong to the ancestral line of tracheophyte. They occurred during the period of Jurassic, Permian, and Silurian respectively. Sphenopsids belonged to Psilophyton.
6. Origin of first seed plants occurred during which period?
Explanation: It was during the Carboniferous period when the first seed plants occurred. Ancestral gymnosperms, ferns, and bryophytes also originated during this period. It occurred at about 6.5 crore years ago.
7. Evolution of gymnosperms was at its peak during the Triassic period.
Explanation: It is a wrong statement as the evolution of gymnosperms were at its peak during the Jurassic period and not Triassic. During the Triassic period, the forests of conifers, cycads, and other gymnosperms evolved.
8. It was during the Cretaceous period when ______ appeared.
Explanation: Angiosperms appeared during the Cretaceous period about 7.1 crore years ago. Dicots also began their evolution during this period. They belonged to the Mesozoic era.
9. Rise of monocots occurred during which epoch?
Explanation: Rise of monocots occurred during the epoch Oligocene. It occurred at about 1.9 crore years ago. They belonged to the Tertiary period of the Cenozoic era.
10. Increase of herbs and grasses occurred _______ years ago.
a) Two lakhs
b) Six lakhs
c) Seven lakhs
d) One crore
Explanation: It was 7 lakh years ago when herbs and grasses increased in population. They belonged to the epoch Pleistocene of the Quaternary period. They collectively occurred during the Cenozoic era.
Sanfoundry Global Education & Learning Series – Biology – Class 12.
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