Biological Classification And System Of Classification Question 551
Question: Which of the following is a mycoplasmal disease
Options:
A) Clover phyllody
B) Stripe disease of sugarcane
C) Yellows dwarf of tobacco
D) All the above
Show Answer
Answer:
Correct Answer: D
Solution:
Phytoplasmas are mycoplasma-like organisms that lack cell wall but have a rigid plasma membrane and exhibit pleomorphism.
Clover phyllody is caused by phytoplasma which results in stunted growth due to reduced intermodal growth, virescence/petal greening and cessation of flower production. Sandal spike is caused by phytoplasma and results in reduced leaf size, “witches-broom” condition caused by loss of apical dominance of the branches and phyllody. Western X-disease is caused by a pathogen called as a Spiroplasma, a mycoplasma-like organism and is characterised by reduced growth, yellowing of leaves with a reddish margin and turning of infected fruit pointed and off colour. Tungro disease of rice is caused by Rice Tungro Bacilliform Virus (RTBV). Thus, the correct answer is option D.
BETA
