Question

Conidia of Albugo is arranged__________.
A. Irregular
B. Acropetally
C. Basipetally
D. Intercalary

Answer 1

Albugo is the plant parasite that is not a true fungus and is called oomycetes. It belongs to an incomplete genus, Albugo is one of three genera that belong to the family Albuginaceae. This pseudo fungus causes white rust or white blister diseases in the plants.

Complete answer:
Albugo represents the 25 species and it is an obligate parasite and mainly attacks crucifer family plant species and mainly causes white rust. In Albugo, male gametes are flagellated, sexual reproduction highly consists of oogamous, because it develops antheridium and oogonium develop into host tissue that makes male is flagellate and forms an association of intercellular space.
Conidia show parallel arrangement which is upward to downward movement, it consists of an arrangement of younger at the base and older at the top and this arrangement shows succession which is basipetal. Biflagellate zoospore has connected the antheridium and oogonium that are present in hyphal branches, so zoospore present in uninucleate form and slightly appear as concave and convex biflagellate, which attached to its vacuole region and provide flagellar movement such as whiplash movement.
The Albugo reproduce sexually by producing sexual spores (oospores) and asexual spores called sporangia in many stages in the disease cycle. This parasitic organism prefers moist and cool conditions and it is temperature sensitive and the range of temperature tolerance is 55 to 77 Fahrenheit. It rarely spreads in dry or hot conditions or environments.
Hence, the correct option is C.

Note: A disease called white rust by Albugo is devastating to many economically important species of crop plants throughout the world, it is the most important foliar disease of Brassicaceae species. It is difficult to control the white rust disease due to the nature of the Albugo pathogen.