Question

Match List I with List II:

Choose the correct answer from the options given below:

• A. A-III, B-I, C-II, D-V
• B. A-III, B-II, C-IV, D-I
• C. A-I, B-III, C-IV, D-V
• D. A-I, B-II, C-IV, D-V

Hint:

Phytoalexins = Antimicrobial (Defense).
Florigen = Flowering.
Identifying these two prominent pairs usually leads to the correct option in a match-the-following grid.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
This question requires matching various plant secondary metabolites and signaling molecules in List I with their primary characteristics, categories, or functions in List II.
Detailed Explanation:

• Phytoalexins (A - III):
Phytoalexins are antimicrobial compounds synthesized by plants de novo in response to infection by pathogens (fungi, bacteria). They are a key part of the plant's active defense mechanism.

• Florigen (B - I):
Florigen is the hypothesized "flowering hormone" that is produced in leaves under inductive daylength conditions and transported to the shoot apex to trigger flowering. (Now known to be the FT protein).

• Phenolics (C - II):
Phenolics are a broad class of secondary metabolites (including tannins, lignins, and flavonoids) that often serve as defense compounds against herbivores and pathogens due to their toxicity or deterrent properties.

• Terpenoids (D - V):
Terpenoids are the largest class of secondary metabolites. This group includes essential primary metabolites like carotenoids (pigments) and sterols (membrane components), as well as many defense-related oils and resins.

Step 2: Final Answer:
The correct sequence is A-III, B-I, C-II, D-V, matching Option (A).