JKPSC KAS Mains 2022 Botany Paper 2:
(i) There are eight questions divided in two Sections and printed 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 English in Question-Cum-Answer (QCA) Booklet in the space provided.
(ii) Your answer should be precise and coherent.
(iii) If you encounter any typographical error, please read it as it appears in the text book.
(iv) Candidates are in their own interest advised to go through the general instructions on the back side of the title page of the Answer Script for strict adherence.
v) No continuation sheets shall be provided to any candidate under any circumstances.
(vi) No blank page be left in between answer to various questions.
1. Write short notes on:
(a) Biological nitrogen fixation. (10)
(b) Nuclear pore complex. (10)
(c) Bulk flow hypothesis of phloem transport. (10)
(d) DNA fingerprinting. (10)
(e) Sex linked inheritance in plants. (10)
2. (a) Describe the process of signal transduction in eukaryotic cells. (20)
(b) Enumerate the general characteristics of enzymes and explain their mechanism of action. (15)
(c) Define standard deviation and coefficient of variation. If mean and standard deviation of a data series are 34.60 and 14.00 respectively, compute the value of coefficient of variation. (15)
3. (a) Discuss the various modes of solute movement across cell membrane. (20)
(b) Highlight the essential properties of plant growth regulators. List the physiological roles of auxin and ethylene. (15)
(c) Comment on the role of RNA in origin and evolution of life on earth. (15)
4. (a) What are the reasons for global warming? Mention the mitigation strategies to combat climate change. (20)
(b) List the types and causes of seed dormancy. What are the treatments to overcome the dormancy of seeds? (15)
(c) Describe the semi autonomous organelles of eukaryotic cells. Comment on the endosymbiotic theory. (15)
5. Briefly explain
(a) Hybridization. (10)
(b) Mode of action of phytochrome. (10)
(c) Phytogeographical regions of India.
(d) Phytoremediation. (10)
(e) Incomplete dominance using Punnett square. (10)
6. (a) What are the various types of intellectual property rights? Illustrate with examples how IPR can be used to protect farmer’s rights. (20)
(b) Describe plant succession in aquatic environment (hydrosere). (15)
(c) How are plants affected by heat stress and what are the various coping strategies? (15)
7. (a) Compare and contrast C4 and CAM pathways of photosynthesis. Comment on their evolutionary significance. (20)
(b) List the methods of producing transgenic plants and explain the biosafety concerns involved. (15)
(c) Differentiate between (any THREE). (3 X 5 = 15)
(i) Oxidative phosphorylation and photophosphorylation.
(ii) Light microscope and electron microscope.
(iii) Phototropism and geotropism.
(iv) Polytene chromosome and B-chromosome.
(v) Lysosome and peroxisome.
(vi) Florigen and vernalin.
8. (a) Explain the process of photoperiodism. List the categories of plants based on their response to critical day length. Comment on the importance of dark period in photoperiodic response. (20)
(b) List the various ways in which gene expression is regulated. What is gene silencing? (15)
(e) Critically analyze the need to conserve biodiversity and the strategies being adapted for the same. (15)