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[A] : Phytoalexins are formed as a resul...

[A] : Phytoalexins are formed as a result of mixing of auxins and gibberellins secreted in response to fungi .
[R] : Phytoalexins show antibiosis .

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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Phytoalexins are secreted by plants in response to fungal reaction. These compounds are generally

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Aqueous solution of a salt 'A', when mixed with NaoH solution and warmed, a black precipitate is formed. Black ppt. is filtered and dissolved in dil. H_(2)SO_(4) solution. The resulting solution gives a chocolate coloured precipitate with potassium ferrocyanide solution. the filtrate obtained after filtering off the black precipitate, upon warming with Zn and NaOH evolves a pungent smelling gas. the resulting solution also responds to the ring test. the filtrate does not evolve any gas when it is boiled with urea in the presence of H_(2)SO_(4) . Q. The filtrate obtained after filtering off the black precipitate consists of:

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TRUEMEN BIOLOGY ENGLISH-Fungi -ASSERTION AND REASON
  1. [A] : Heterotrophs may be free living or symbiotic . [R] : They form...

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  2. [A] : Rusts and smuts are club fungi that parasitize cereal crops . ...

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  3. Assertion : The fungi are widespread in distribution and they even liv...

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  4. [A] : Symbiosis is also furnished by mycorrhiza . [R] : In Mycorrhiz...

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  5. [A] : Phytoalexins are formed as a result of mixing of auxins and gi...

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  6. [A] : Zygospore fungi produce spores within sporangia . [R] : During...

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  7. [A] : Club fungi reproduce sexually . [R] : In club fungi , dikaryot...

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  8. [A] : The sterile portion of sporangium in Mucor is called columella ....

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  9. [A] : Fungi are thallophyta . [R] : Cell wall of fungi is made up of...

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  10. [A] : Fungi are either saprobes or parasitic . [R] : Fungi posses ha...

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  11. [A] : Aspergillus is used as bioindicator . [R] : Aspergillus niger ...

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  12. [A] : Rhizopus contains two types of hyphae . [R] : The unbranched h...

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  13. [A] : Puccinia graminis is autoecious . [R] : It complete its life c...

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  14. [A] : Schizosaccharomyces is also called the fission yeast . [R] : S...

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  15. [A] : Ascomycetes and basidiomycetes are septate fungi . [R] : The h...

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  16. [A] : Myxomycetes are not true fungi . [R] : Myxomycetes possess cha...

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  17. [A] : Aflatoxins are produced by fungus . [R] : Aflatoxins are carc...

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  18. [A] : Amanita is called toadstools . [R] : Amanita is a poisonous fu...

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  19. [A] : Yeast are used in baking industry . [R] : CO(2) produced durin...

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  20. [A] : Foliose lichens show similarity with dicot leaves [R] : They b...

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