Q.5 Match List I with List II

Choose the correct answer from the options given below:

1. A-IV, B-I, C-III, D-II
2. A-III, B-IV, C-II, D-I
3. A-II, B-III, C-I, D-IV
4. A-I, B-II, C-IV, D-III

   The correct answer is A-II, B-III, C-I, D-IV.

   Matching Explanation

   Red rust disease of tea leaves (A) is caused by the parasitic green alga Cephaleuros, which produces reddish spots on leaves. Chlorellin (B), an antibiotic substance, is derived from Chlorella, a single-celled green alga. The Gongrosira stage (C) refers to the akinete or cyst formation in Vaucheria, resembling the alga Gongrosira under stress conditions. Sea palm (D) is the common name for Postelsia palmaeformis, a brown alga found on Pacific rocky shores.

   Option Analysis

   • A-IV, B-I, C-III, D-II: Incorrect; mismatches sea palm with red rust and swaps others.

   • A-III, B-IV, C-II, D-I: Incorrect; confuses Chlorella with red rust and Gongrosira with Cephaleuros.

   • A-II, B-III, C-I, D-IV: Correct; aligns all terms precisely as above.

   • A-I, B-II, C-IV, D-III: Incorrect; wrongly links red rust to Vaucheria and sea palm to Postelsia swap.

   Red rust disease of tea leaves, Chlorellin, Gongrosira stage, and sea palm represent key algae concepts in molecular biology and microbiology for competitive exams. This match-the-following question tests phycology knowledge, linking plant pathology to algal reproduction and metabolites.

   Red Rust Disease of Tea Leaves (Cephaleuros)

   Cephaleuros virescens, a parasitic green alga (Chlorophyta), causes red rust on tea (Camellia sinensis) leaves, forming orange-brown velvety spots that reduce yield in humid tropics. Spores germinate on leaf surfaces, penetrating tissues without haustoria, thriving in high humidity and temperature. Control involves pruning, fungicides, and shade to limit spread.

   Chlorellin from Chlorella

   Chlorellin is an antibacterial fatty acid mixture produced by Chlorella vulgaris, the first antibiotic from autotrophic green algae (Chlorophyta). It inhibits Gram-positive and Gram-negative bacteria, with applications in health supplements despite metal accumulation concerns. Chlorella is mass-cultured for its growth factor and probiotics.

   Gongrosira Stage in Vaucheria

   In Vaucheria (Xanthophyta), the Gongrosira stage occurs during asexual reproduction under desiccation or cold, where the filament segments into thick-walled akinetes or cysts rich in oil, mimicking Gongrosira alga. These cysts germinate into new thalli upon favorable conditions, aiding survival.

   Sea Palm (Postelsia)

   Postelsia palmaeformis, known as sea palm, is a brown alga (Phaeophyceae) on North American Pacific rocky shores, enduring air exposure with palm-like holdfast and stipes up to 60 cm. It photosynthesizes in intertidal zones, harvested for food in some regions.

   Exam Relevance

   This matching aligns with GATE Life Sciences, CSIR NET syllabi on algal diversity, pathology, and reproduction. Focus on parasitic algae like Cephaleuros for plant biotech and Xanthophyta life cycles for microbiology.