Question:
Identify the compound found to aid in defense against invading organisms in plants
(A). Jasmonates
(B). Salicylic acid
(C). Polyamines
(D). Brassinolates
Choose the correct answer from the options given below:
Identify the compound found to aid in defense against invading organisms in plants
(A). Jasmonates
(B). Salicylic acid
(C). Polyamines
(D). Brassinolates
Choose the correct answer from the options given below:
(A). Jasmonates
(B). Salicylic acid
(C). Polyamines
(D). Brassinolates
Choose the correct answer from the options given below:
Show Hint
Remember:
- Salicylic Acid (SA) = Defends against biotrophic pathogens (viruses, bacteria).
- Jasmonic Acid (JA) = Defends against necrotrophic pathogens and chewing insects.
Updated On: Jul 13, 2026
- (A) and (D) only.
- (B) and (D) only.
- (C) and (D) only.
- (A) and (B) only.
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Plants have evolved complex defense systems to survive attacks by insect herbivores and microbial pathogens.
These defense responses are regulated by endogenous plant hormones that trigger specific signaling pathways.
Step 2: Detailed Explanation:
- Jasmonates (Jasmonic acid and its derivatives) [A]: These lipid-derived compounds act as key signaling molecules in defense against necrotrophic pathogens, wounding, and herbivorous insects.
They trigger the synthesis of defensive proteins, such as protease inhibitors, which deter insect feeding.
- Salicylic Acid (B): A phenolic compound that plays a central role in plant defense against biotrophic and hemibiotrophic pathogens.
It regulates systemic acquired resistance (SAR), which provides long-term, plant-wide resistance to secondary infections.
- Polyamines (C) and Brassinosteroids/Brassinolates (D): Primarily regulate plant growth, development, cell elongation, and tolerance to abiotic stresses, rather than acting as primary defense signals against pathogens.
Therefore, Jasmonates and Salicylic acid are the primary hormones involved in plant defense against invading organisms.
Step 3: Final Answer:
The compounds that help defend plants against invading organisms are Jasmonates and Salicylic acid.
Plants have evolved complex defense systems to survive attacks by insect herbivores and microbial pathogens.
These defense responses are regulated by endogenous plant hormones that trigger specific signaling pathways.
Step 2: Detailed Explanation:
- Jasmonates (Jasmonic acid and its derivatives) [A]: These lipid-derived compounds act as key signaling molecules in defense against necrotrophic pathogens, wounding, and herbivorous insects.
They trigger the synthesis of defensive proteins, such as protease inhibitors, which deter insect feeding.
- Salicylic Acid (B): A phenolic compound that plays a central role in plant defense against biotrophic and hemibiotrophic pathogens.
It regulates systemic acquired resistance (SAR), which provides long-term, plant-wide resistance to secondary infections.
- Polyamines (C) and Brassinosteroids/Brassinolates (D): Primarily regulate plant growth, development, cell elongation, and tolerance to abiotic stresses, rather than acting as primary defense signals against pathogens.
Therefore, Jasmonates and Salicylic acid are the primary hormones involved in plant defense against invading organisms.
Step 3: Final Answer:
The compounds that help defend plants against invading organisms are Jasmonates and Salicylic acid.
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