जंपिंग जीन्सबद्दल योग्य विधाने ओळखा: (a) हे जीन्स आहेत जे त्यांची जागा बदलू शकतात. (b) यांना ट्रान्सपोसन्स असेही म्हणतात. (c) बार्बरा मॅकक्लिंटॉक यांनी 1965 मध्ये हे प्रथम शोधले होते.
This MPSC previous-year question is drawn from MPSC Rajyaseva (State Services) Combined Pre 2026 (Marathi). It belongs to the Science section and is reproduced here in Marathi exactly as it appeared in the official Maharashtra Public Service Commission paper, along with the four options, the official Set A answer key and a compact explanation of why the correct option is correct.
Correct answer: D
Explanation
पडताळलेले उत्तर पर्याय D आहे. उत्तरतालिकेनुसार जंपिंग जीन्सबाबतची तिन्ही विधाने ग्राह्य — ते जागा बदलू शकतात, त्यांना ट्रान्सपोसन्स म्हणतात आणि त्यांचे श्रेय बार्बरा मॅकक्लिंटॉक यांना दिले जाते. म्हणून 'वरील सर्व' हा निवडलेला पर्याय.
Why this question matters
MPSC's answer-key process — including the objection round after every paper — means the official Set A answer keys we use are the authoritative reference for questions like this. When you see a discrepancy between two coaching-institute keys, the official MPSC revised key (which we track) is the source of truth. Anchoring your revision on the official key prevents second-guessing on the day of the actual exam.
How to attempt this in the exam
Do the arithmetic on scratch paper even for one-step science numericals. The most common wrong answer in MPSC's numerical items is a rounding error or a unit mismatch, not a conceptual mistake. Writing each step out costs ten seconds and prevents the majority of those errors.
Subject-specific tip
Tip for Science: write the underlying formula or chemical equation in the margin. MPSC Science numericals are usually one-step substitutions; the trap is in the units, not the concept.
How MPSC frames science questions
MPSC's General Science items are almost never conceptual essays — they are precisely worded factual items with four options that swap one attribute at a time (a wrong element, a wrong hormone, a wrong disease, a wrong scientist). Recognising that pattern is worth two to three marks a paper. Practise reading the option set FIRST, then the question — if all four options are elements, you know the question is about chemistry; if all four are diseases, you know the question is about pathology. This inversion habit shaves seconds off each item.
The Nobel-related, ISRO-related and biotechnology-related items are the most current-affairs-driven part of General Science. Skim the last twelve months of PIB releases and the annual ISRO / DAE / DBT summaries — those roughly one thousand words cover every current-science item MPSC is likely to ask. Our topic-wise Science packs on the practice mode include the most recent picks from these sources.
For MPSC PSI, RTO AMVI and Technical Services papers, the science portion additionally tests applied physics — vehicle dynamics, tyre friction, engine efficiency, braking distance. Those specialised items are a large fraction of the RTO AMVI syllabus and appear on our RTO AMVI practice pack.
Source and editorial process
Source: MPSC Rajyaseva (State Services) Combined Pre 2026 (Marathi). This question, its four options and the marked correct answer are transcribed verbatim from the official Maharashtra Public Service Commission Set A paper. Our editorial team cross-checks each question against the original PDF released on mpsc.gov.in and against the corresponding official answer key.
We never paraphrase the wording. Where MPSC has issued a revised key after an objection round, the answer highlighted above reflects the revised key and the revision is logged in our internal change-log. If you spot a discrepancy, please email us at dontknowacademy@gmail.com — we acknowledge every report within 24 hours and push a fix within 48 hours.
Related study material
Deepen your preparation on this topic with our long-form MPSC study guides. Every guide is written specifically for the Maharashtra Public Service Commission preliminary syllabus and takes twelve to sixteen minutes to read in full.
- MPSC Exam PatternGroup B, Group C, PSI, Gazetted CS & TS prelims — marks, syllabus, negative marking, cut-offs.
- MPSC Preparation Strategy6-month plan, book list, daily routine, PYQ usage, mock-test strategy.
- Indian Polity for MPSCConstitution, Fundamental Rights, DPSPs, Parliament, state government, key amendments.
Practice the full subject
MPSC Rajyaseva (State Services) Combined Pre 2026 (Marathi)
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