CS (Main) Exam 2021 Botany Paper-II Question Paper PDF

Central Government Jobs Other Jobs 2021

  • Year 2021
  • Conducted By UPSC
  • Questions 8
  • Maximum Marks 250
  • Duration Three Hours
  • Languages Hindi & English

Exam Details

Detail Information
Examination CS (Main) Exam, 2021
Year 2021
Conducting Body UPSC
Paper Botany Paper-II
Subject Botany
Duration Three Hours
Maximum Marks 250
Number of Questions 8
Question Type Mixed

This is the Botany Paper-II for the CS (Main) Examination, 2021, conducted by UPSC. The paper is designed to assess candidates' in-depth knowledge of Botany. It consists of 8 questions divided into two sections, with candidates required to answer five questions in total. Questions 1 and 5 are compulsory, and at least one question must be attempted from each section. The total marks for the paper are 250, and the allowed time is three hours. This paper is crucial for aspirants aiming to qualify for the Civil Services.

Major Topics Covered

  • Cell adhesion molecules
  • Ribosomal RNA processing
  • Genetic consequences of Inversion
  • Gene silencing
  • Apomixis in plant breeding
  • Chromatin structure and composition
  • DNA packaging in eukaryotic cells
  • Linkage: Coupling and Repulsion hypothesis
  • Chromosome mapping
  • Three-point test cross
  • Standard deviation
  • Coefficient of variation

Why This Paper is Important

  • Useful for CS (Main) Exam preparation
  • Helps understand the latest exam pattern
  • Useful for practice and self-assessment
  • Covers frequently asked General Studies topics
  • Helpful for analysing question trends

Related Resources

  • CS (Main) Exam 2021 Botany Paper-I
  • CS (Main) Exam 2021 General Studies Paper-I
  • CS (Main) Exam 2021 General Studies Paper-II
  • CS (Main) Exam 2021 Essay Paper
  • CS (Main) Exam 2021 Botany Paper-II Answer Key
  • CS (Main) Exam Botany Syllabus
  • UPSC Mains Botany Syllabus
  • CS (Main) Exam Pattern

Instructions

  • प्रश्न हैं जो दो खण्डों में विभाजित हैं तथा हिन्दी और अंग्रेज़ी दोनों में छपे हुए हैं ।
  • परीक्षार्थी को कुल पाँच प्रश्नों के उत्तर देने हैं।
  • प्रश्न संख्या 1 और 5 अनिवार्य हैं तथा बाकी प्रश्नों में से प्रत्येक खण्ड से कम-से-कम एक प्रश्न चुनकर किन्हीं तीन प्रश्नों के उत्तर दीजिए ।
  • प्रत्येक प्रश्न/भाग के अंक उसके सामने दिए गए हैं ।
  • प्रश्नों के उत्तर उसी प्राधिकृत माध्यम में लिखे जाने चाहिए जिसका उल्लेख आपके प्रवेश-पत्र में किया गया है, और इस माध्यम का स्पष्ट उल्लेख प्रश्न-सह-उत्तर (क्यू.सी.ए.) पुस्तिका के मुख-पृष्ठ पर निर्दिष्ट स्थान पर किया जाना चाहिए ।
  • प्राधिकृत माध्यम के अतिरिक्त अन्य किसी माध्यम में लिखे गए उत्तर पर कोई अंक नहीं मिलेंगे ।
  • प्रश्नों में शब्द सीमा, जहाँ विनिर्दिष्ट है, का अनुसरण किया जाना चाहिए ।
  • जहाँ आवश्यक हो, अपने उत्तर को उपयुक्त आरेखों | चित्रों द्वारा दर्शाइए ।
  • इन्हें प्रश्न का उत्तर देने के लिए दिए गए स्थान में ही बनाना है ।
  • प्रश्नों के उत्तरों की गणना क्रमानुसार की जाएगी ।
  • यदि काटा नहीं हो, तो प्रश्न के उत्तर की गणना की जाएगी चाहे वह उत्तर अंशतः दिया गया हो ।
  • प्रश्न-सह-उत्तर (क्यू.सी.ए.) पुस्तिका में खाली छोड़ा हुआ पृष्ठ या उसके अंश को स्पष्ट रूप से काटा जाना चाहिए ।

  • There are EIGHT questions divided in TWO SECTIONS and printed both in HINDI and in ENGLISH.
  • Candidate has to attempt FIVE questions in all.
  • Questions no. 1 and 5 are compulsory and out of the remaining, any THREE are to be attempted choosing at least ONE question from each section.
  • The number of marks carried by a question / part is indicated against it.
  • Answers must be written in the medium authorized in the Admission Certificate which must be stated clearly on the cover of this Question-cum-Answer (QCA) Booklet in the space provided.
  • No marks will be given for answers written in a medium other than the authorized one.
  • Word limit in questions, wherever specified, should be adhered to.
  • Diagrams/figures, wherever required, may be drawn in the space provided for answering the question itself.
  • Attempts of questions shall be counted in sequential order.
  • Unless struck off, attempt of a question shall be counted even if attempted partly.
  • Any page or portion of the page left blank in the Question-cum-Answer (QCA) Booklet must be clearly struck off.

Questions (page 2)

Section A

Q1. Write short notes on the following:
निम्नलिखित पर संक्षिप्त टिप्पणियाँ लिखिए:

(a) कोशिका आसंजन अणु
Cell adhesion molecules

(b) राइबोसोमल आर.एन.ए. का केन्द्रिक में प्रसंस्करण
Ribosomal RNA processing in nucleolus

(c) प्रतिलोमन के आनुवंशिक परिणाम
Genetic consequences of Inversion

(d) जीन साइलेंसिंग
Gene silencing

(e) पादप प्रजनन में असंगजनन का उपयोग
Use of apomixis in plant breeding

Section A

Q2.

(a) क्रोमैटिन के प्रकारों तथा संयोजन का वर्णन कीजिए । यूकैरियोटिक कोशिका में डी.एन.ए. कैसे पैकेज होता है ?
Describe types and composition of chromatin. How is DNA packaged in a eukaryotic cell ?

(b) सहलग्नता में युग्मन और प्रतिकर्षण परिकल्पना की व्याख्या कीजिए । थ्री-प्वॉइंट परीक्षार्थ संकरण की सहायता से गुणसूत्र मानचित्र तैयार करने में प्रयुक्त प्रक्रिया का संक्षिप्त विवरण दीजिए ।
Explain coupling and repulsion hypothesis in linkage. Give a brief account of procedure used in preparing a chromosome map with the help of three-point test cross.

(c) मानक विचलन और विचरण गुणांक से आप क्या समझते हैं ? इनके महत्त्व की चर्चा कीजिए ।
What do you understand by standard deviation and coefficient of variation? Discuss their significance.

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CS (Main) Exam 2021 Botany Paper-II question paper page 1 instructions scan PDF download UPSC
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Frequently asked questions

What is the name of the exam for which this paper is conducted?

This paper is for the CS (Main) Exam, 2021.

Which conducting body releases this question paper?

The Union Public Service Commission (UPSC) conducts the CS (Main) Exam.

What is the subject of this question paper?

The subject is Botany, specifically Paper-II.

What is the maximum marks for Botany Paper-II?

The maximum marks for this paper are 250.

What is the time duration allowed for this paper?

Candidates are allowed three hours to complete this paper.

How many questions are there in Botany Paper-II?

There are a total of eight questions divided into two sections.

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