JKPSC KAS Mains 2021 Botany Paper 2:
Please read each of the following instructions carefully before attempting the paper.
(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. (a) Principle of Priority and its limitations. (10)
(b) Acetyl CoA is a hub of metabolic activity in the cell. Elaborate. (10)
(c) How useful is the Test of Significance in Statistics. (10)
(d) Lichens as indicators of pollution and their economic importance.
(e) Discuss structure and functions of Lac-operon. (10)
2. (a) Discuss the role of Endoplasmic reticulum in folding, processing and quality control of proteins. (20)
(b) Explain Polyembryony, Is Polyembryony beneficial for plants. (15)
(c) Describe Environment Act, Briefly discuss the rules and regulations of Environment act and comment on its merits and demerits. (15)
3. (a) Explain various phases of mitosis cycle with suitable diagrams. Explain, why it is equational in nature. (20)
(b) Give a brief account about discovery of auxin. Also discuss how cytokinin regulates cell cycle. (15)
(c) Write an explanatory note on the role of secondary metabolites in the plant defence. (15)
4. (a) Explain the role of microbes in bioremediation. (20)
(b) Why Photorespiration is a necessary evil. (15)
(c) What is the significance of knowing the centres of origin in cultivated plants? Discuss Vavilov’s work in relation to these. (15)
5. (a) What is Red Data Book and it’s significance. (10)
(b) GS-GOGAT system. (10)
(c) Phloem loading. (10)
(d) Explain the Role of Apomixis in Plant Breeding. (10)
(e) Explain Cytoplasmic Inheritance with suitable examples. (10)
6. (a) Rubisco is main Enzyme on Earth. Explain the role with suitable examples. (20)
(b) Mention the common name, botanical name, family and parts used of one crop of each- Spice, Beverage, Edible oil and Fiber. (15)
(c) What are invasive species. Explain their role in the Ecosystem with suitable examples. (15)
7. (a) Structure and function of cell wall. (20)
(b) Differentiate between C3, C4 and CAM plants with suitable examples. (15)
(c) Importance of various techniques i.e, PCR, DNA fingerprinting, FISH and Southern blotting. (15)
8. (a) Discuss the role of chromosomal aberrations in cancer. (20)
(b) What is sustainable Development. Highlight’s it’s importance in the present context. (15)
(c) Draw the well labelled structure of Procaryotic cell and explain the mode of nutrition in bacteria. (15)