Immunological Concepts and Applications in Plant Science — DU B.Sc. (Hons.) Botany Previous Year Question Papers

1. (A) Define any five of the following terms: (5x1=5) - 1 (B) Fill in the blanks any five of the following: (5x1=5) i. In the plant immune system, the first layer of induced immunity triggered by recognition of PAMPs is called ii. According to Flor's model, for each resistance gene in the host, there is a corresponding gene in the pathogen. iii. are small nucleic acid molecules that play a key role in developing antiviral resistance in plants. iv. are PRRs that detect flagellin in bacteria and trigger PTI in plants. v. The .. ... are proteins that bind to specific DNA sequences to activate or repress defence genes. vi. • is a whole plant immunity that develops after a localised infection. (C) Expand any five of the following: (5x1=5) 2. Write Short Notes on any three of the following: (3 × 5=15) i. Management of plant pathogens in agriculture. ii. Flor's model of plant pathogen interaction. ili. Biochemical defenses in plants iv. SiRNA and disease resistance in plants v. Differentiate between PTI and ETI 3. Draw well labelled diagrams representing any three of the following: (3x5=15) i. Flagellin-induced resistance as a model system of PTI ii. Structure of Antibody iii. Different signaling routes for ROS burst including activity of the NADPH oxidase. iv. MAPK cascade in plant defense v. Zig-zag model 4. A. Discuss the different pre-existing mechanical defense mechanisms present in plants. B. Describe the defense response elicited upon Calcium spiking in plant cells. (7,5 + 75) 5. A. Elaborate the Salicylic acid, Jasmonic acid, and Ethylene mediated signaling cascades in response to pathogen attack in plants. B. Discuss the application of CRISPR Cas technology for crop improvement. (5) 6. A. Describe the role of any two transcription factor families in mediating plant defense response. B. ISR is considered a valuable tool for sustainable agriculture. Justify this statement by providing suitable reasons. Describe the mechanism of SAR with reference to the key molecules involved in the