Home
Class 12
BIOLOGY
[A] : The obligate parasites can live on...

[A] : The obligate parasites can live only on dead hosts .
[R] : There are some organisms which grow and live together but each one is always harmed by the other . This phenomenon is known as antagonism .

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

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • EVOLUTION

    TRUEMAN BIOLOGY|Exercise MULTIPLE CHOICE QUESTIONS|330 Videos

  • Genetics

    TRUEMAN BIOLOGY|Exercise ASSERTION AND REASON|123 Videos

Similar Questions

Explore conceptually related problems

[A] : Living organisms do not interact with each other. [R] : All living organisms have originated independently.

[A] : When the organisms live together in such a manner that one organism benefitted , while other has no effects , it is called commensalism . [R] : In commensalism one partner derives benefit from the other partner without in any way benefitting or harming it .

[A] : Energy can be transformed from one form to another by living organisms. [R] : All organisms can not manufacture energy but they transform it

Which of the following statements is not correct 1. Insects that consume pollen or nectar without bringing about pollination are called pollen/nectar robbers 2. Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil 3. Some reptiles have also been reported as pollinators in some plant species 4. Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style

In the atmosphere, carbon dioxide is found in two forms, i.e., ^12CO_2 and ^14CO_2 . Plants absord CO_2 during photosynthesis in presence of chlorophyll, plants systhesise glucose 6CO_2 +6 H_2O rarr C_6H_12O_6 + 6O_2uarr Half life of ^14CO_2 is 5760 years. The analysis of wooden artifacts for ^14C and ^12C gives useful information for determination of its age. All living organisms, because of their constant exchange of Carbon dioxide with the surroundings have the same ratio of C-14 to C-12, i.e. 1.3xx10^-12 . When an organism dies, the C-14 in it keeps on decaying as follows: 6^14Crarr7^14N+(-1)^0e +Energy Thus, the ratio of C-14 and C-12 decreases with the passage of time. We can measure the proportion of C-14 in the remains of dead organism and determine how long ago it died. The method of carbon dating can be used to date anything made or organic matter, e.g., bone, skeleton, wood, etc. Using carbon dating, materials have been dated to about 50,000 years with accuracy. A piece of wood from an archeological source shows a C-14 activity which is 60% of the activity found in fresh wood today. The age of archeological sample will be:

Read the following statement regarding the mineral (i) Both Rhiqobium and Frankia are free living in soil, but as symbionts, can fix atmospheric nitrogen. (ii) Ammonia synthesis by nitrogenase requires 16 ATP for each ammonia produced. (iii) While most of plants can assimilate nitrate as well as ammonium ions, the latter is quite toxic to plnats and hence cannot accumulate in them. (iv) Along with the transpiration stream, the nodules of some plants export the fixed nitrogen as urides. Which of these are correct

If a continuous function f defined on the real line R assume positive and negative values in R, then the equation f(x)=0 has a root in R. For example, if it is known that a continuous function f on R is positive at some point and its minimum value is negative, then the equation f(x)=0 has a root in R. Consider f(x)= ke^(x)-x , for all real x where k is a real constant. For k > 0, the set of all values of k for which y=ke^(x)-x=0 has only one root is

TRUEMAN BIOLOGY-Fungi -ASSERTION AND REASON
  1. [A] : Lichens are of considerable ecological imporance as pioneers in ...

    Text Solution

    |

  2. [A] : Bordeaux mixture is an organic fungicide . [R] : Bordeaux mixt...

    Text Solution

    |

  3. [A] : The obligate parasites can live only on dead hosts . [R] : The...

    Text Solution

    |

  4. [A] : Disease reduce the vitality of plants , inhibit their developmen...

    Text Solution

    |

  5. [A] : Lichens are composite organisms . [R] : The fungal component i...

    Text Solution

    |

  6. [A] : Candida is a false yeast . [R] : It lacks ascus formation .

    Text Solution

    |

  7. [A] : Heterotrophs may be free living or symbiotic . [R] : They from...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  11. [A] : Phytoalexins are formed as a result of fusion between auxins and...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |