AIPMT 2000 question paper with solutions

187 questions · 180 min

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Sample questions with solutions

Q1

Which is showing accurate pairing ?

  • A.

    Gonorrhoea - Leishmania denovoni

  • B.

    Syphilis - Treponema pallidum

  • C.

    Typhoid – Mycobacterium leprae

  • D.

    AIDS - Bacillus conjugalis

Answer: B

  1. Recall the correct causative agent of Syphilis — it is caused by the spirochete bacterium Treponema pallidum, making this pairing accurate.

  2. Evaluate the other options — Gonorrhoea is actually caused by Neisseria gonorrhoeae, not Leishmania donovani (which causes leishmaniasis/kala-azar); Typhoid is caused by Salmonella typhi, not Mycobacterium leprae (which causes leprosy); and AIDS is caused by the HIV retrovirus, not a bacterium like Bacillus conjugalis.

  3. Since only the Syphilis-Treponema pallidum pairing is factually correct, it stands out among the options.

  4. Hence, the answer is Syphilis - Treponema pallidum (Option B).

Q2

Which hormone is responsible for fruit ripening?

  • A.

    Ethylene

  • B.

    Auxin

  • C.

    Ethyl chloride

  • D.

    Cyctokinin

Answer: A

  1. Recall the general nature of ethylene: ethylene is largely a growth-inhibiting phytohormone, although it is also involved in certain growth-promoting activities.

  2. Identify its specific role in fruit ripening: it has been well established that ethylene is the hormone responsible for fruit ripening. Given this,

Ethylene→Stimulates biochemical changes of fruit ripening\text{Ethylene} \rightarrow \text{Stimulates biochemical changes of fruit ripening}

  1. Understand the mechanism briefly: ethylene stimulates all the various biochemical changes (such as softening, color change, and sugar conversion) that occur during the fruit ripening process.

  2. Eliminate the other options: auxin and cytokinin are not primarily responsible for ripening; ethyl chloride is not a naturally occurring plant hormone at all.

Hence, the correct answer is A. Ethylene.

Q3

Which is the most important factor for continuity of a species from evolutionary point of view ?

  • A.

    Formation of gametes

  • B.

    Synthesis of proteins

  • C.

    Replication of genetic material

  • D.

    None of these

Answer: C

  1. First, recall that for a species to continue existing across generations, its genetic information must be reliably passed on from parents to offspring.

  2. This requires the replication of genetic material (DNA), since only through accurate copying and transmission of DNA can hereditary information continue into the next generation.

  3. Now rule out the other options: formation of gametes is important specifically for sexual reproduction, but it doesn't apply to asexual organisms, which still achieve continuity through genetic material replication alone. Synthesis of proteins is a downstream cellular process that doesn't directly determine species continuity.

  4. Since replication of genetic material occurs in both sexual and asexual organisms and is fundamentally necessary for passing on hereditary information, it is the most universally important factor.

  5. Hence, the answer is C. Replication of genetic material.

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