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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-ENVIRONMENTAL ISSUES-Assertion and reason
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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 se...

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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 diffe...

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

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  10. $ The relationship between comparable organs and structure is called A...

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

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  12. $ Peptidogycan is found in the cell wall of Algae. ! Blue-green Alga...

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  13. $ Mesosome is a type of polyribosomes. ! Polyribosomes from a part o...

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  14. $ Halophytes are those plants which grow in salty soils. Heliophyte...

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  15. $ Spirulina is a rich source of proteins. ! Spirulina has a spiral c...

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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 ...

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  18. $ Protists are eukaryotes ! Eukaryotes do not have the double membra...

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  19. $ Euglena is biflagellated and has cell wall. ! Because cell wall is...

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  20. $ The glagellum in protists is single stranded. ! Single stranded fl...

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