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Matrix A has m rows and n+5 columns, mat...

Matrix A has m rows and `n+5` columns, matrix B has m rows and `11-n` columns. If both AB and BA exist, prove that AB and BA are square matrices.

A

Bryophytes and Pteridophytes

B

Pteridophytes and gymnosperms

C

Gymnosperms and angiosperms

D

Pteridophytes and bryophytes

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The correct Answer is:
D
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  9. Which of the following is heterosporous

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  10. Selelct one of the following paris of important features distinguishig...

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  11. Which one of the following plants is monoecious?

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  12. Which one of the following has haplontic life cycle?

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  13. Which one of the following is a vascular cryptogam?

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  14. Which one of the following is a vascular cryptogam?

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  15. Male and female gametophytes are independent and free-living in

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  16. Algae have cell wall made up of

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  17. Some hyperthermophilic organisms that grow in highly acidic (pH 2) hab...

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  18. A prokaryotic autotrophic nitrogen fixing sym- biont-is found in

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  19. Archegoniophore is present in

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  21. The gametophyte is not an independent, free-living generation in

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