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$ The oldest microfossils of organisms r...

$ The oldest microfossils of organisms resemble the modern day cyanobacteria.
! Cyanobacteria have oxygenic photosynthesis.

A

If both As and R are correct and R is correct explanation of As

B

If both As and R are correct but R is not correct explanation of As

C

If As is correct, R is wrong

D

If both As and R are wrong.

Text Solution

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The correct Answer is:
A
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DINESH PUBLICATION ENGLISH-ENVIRONMENTAL ISSUES-Assertion and reason
  1. Assertion; Amitosis occurs with spindle formation. Reason;Amitosis o...

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  2. $ Karyokinesis is followed by cytokinesis. ! Two daughter nuclei are...

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  3. $ The oldest microfossils of organisms resemble the modern day cyanoba...

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  4. In two kingdom classification , fungi were given a special status sepa...

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  5. Viruses are at a border line position between living and non living. ...

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  6. $ Ecologically, animals are consumers. ! Living organisms are class...

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  7. $ Systematics may be defined as that branch of science which deals wit...

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  8. Homologous organs are those which are functionally similar but differe...

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  9. $ Classification based on the evolutionary relationships among the org...

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  10. A group of related genera is classified as ...........

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  11. Progenote is considered to be the more ancient form of life which gave...

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  12. $ Peptidoglycan is found in the cell wall of Algae. ! Blue-green Alg...

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  13. Mesosome is a type of polyribosomes. Polyribosomes from a part of th...

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  14. Halophytes are those plants which grow in salty soils. Heliophytes ...

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  15. Spirulina is a rich source of proteins. Spirulina has a spiral chlor...

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  16. $ Sulphur depended archaebacteria are called thermoacidophiles. ! Ar...

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  17. Nostoc has chloropyll "a" and phycocyanin pigments. Chlorophyll "a" ...

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  18. Protists are eukaryotes Eukaryotes do not have the double membraned ...

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  19. Euglena is biflagellated and has cell wall. Because cell wall is pre...

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  20. A: The Flagellum in protists is single stranded. R: Single stranded ...

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