Question

Match List I with List II
List I (Character):
A. Spores/Cells with two anterior, unequal, whiplash flagella
B. Spores/Cells with one posterior whiplash flagellum
C. Spores/Cells with two flagella; one anterior and one posterior
D. Spores/Cells without any flagella
List II (Pathogen):
I. Magnaporthe
II. Phytophthora
III. Synchytrium
IV. Plasmodiophora
Choose the correct answer from the options given below:

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

Hint:

Magnaporthe is a true fungus (Ascomycota) and lacks flagellated cells entirely. Phytophthora is an Oomycete, which always produces heterokont biflagellate zoospores (one tinsel, one whiplash).

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Flagellation type is a key morphological feature used to classify lower fungi and fungal-like protists.
True fungi (Ascomycota, Basidiomycota) completely lack flagellated stages.

Step 2: Detailed Explanation:
Let us match the flagellation characteristics with the respective pathogen groups:
A. Spores/Cells with two anterior, unequal, whiplash flagella: This is the defining feature of the zoospores of Plasmodiophora brassicae (Phylum Plasmodiophoromycota, which causes clubroot of crucifers).
Therefore, A matches with IV (Plasmodiophora).
B. Spores/Cells with one posterior whiplash flagellum: This is characteristic of the Division Chytridiomycota, which includes Synchytrium endobioticum (causes potato wart).
Their zoospores are uniflagellate with a single posterior whiplash flagellum.
Therefore, B matches with III (Synchytrium).
C. Spores/Cells with two flagella; one anterior and one posterior: Zoospores of Oomycetes, such as Phytophthora species, are biflagellate.
They possess one anteriorly directed tinsel (pleuronematic) flagellum and one posteriorly directed whiplash (acronematic) flagellum.
Therefore, C matches with II (Phytophthora).
D. Spores/Cells without any flagella: Members of the Ascomycota (such as Magnaporthe oryzae, the rice blast pathogen) produce non-motile conidia and ascospores that lack flagella entirely.
Therefore, D matches with I (Magnaporthe).

Step 3: Final Answer:
The matches are: A - IV, B - III, C - II, D - I, which corresponds to Option (B).