Question:
In which of the following diseases, the symptom is spatially separated from the pathogen niche?
In which of the following diseases, the symptom is spatially separated from the pathogen niche?
Show Hint
Crown gall:
- Pathogen: Agrobacterium tumefaciens (bacterium).
- Symptom: Galls at crown.
- Pathogen niche: Soil (not in the gall).
- T-DNA transfer causes gall formation.
- Pathogen: Agrobacterium tumefaciens (bacterium).
- Symptom: Galls at crown.
- Pathogen niche: Soil (not in the gall).
- T-DNA transfer causes gall formation.
Updated On: Aug 27, 2026
- Crown gall
- Die back
- Leaf spot
- Blight
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Question:
This question tests knowledge of the relationship between symptoms and the location of the pathogen.
Step 2: Detailed Explanation:
In crown gall (A), the symptom (gall formation) is spatially separated from the pathogen niche.
The pathogen (Agrobacterium tumefaciens) lives in the soil and enters the plant through wounds.
It causes gall formation at the crown (root-shoot junction), but the pathogen itself is not present in the galls.
The bacterium transfers T-DNA to plant cells, which causes uncontrolled growth (galls).
Other diseases:
- Die back (B): Pathogen is present at the infection site.
- Leaf spot (C): Pathogen is present at the spot.
- Blight (D): Pathogen is present at the infection site.
Thus, crown gall is the disease where the symptom is separated from the pathogen niche.
Step 3: Final Answer:
Thus, in crown gall, the symptom is spatially separated from the pathogen niche, which corresponds to option (A).
[0.5cm]
This question tests knowledge of the relationship between symptoms and the location of the pathogen.
Step 2: Detailed Explanation:
In crown gall (A), the symptom (gall formation) is spatially separated from the pathogen niche.
The pathogen (Agrobacterium tumefaciens) lives in the soil and enters the plant through wounds.
It causes gall formation at the crown (root-shoot junction), but the pathogen itself is not present in the galls.
The bacterium transfers T-DNA to plant cells, which causes uncontrolled growth (galls).
Other diseases:
- Die back (B): Pathogen is present at the infection site.
- Leaf spot (C): Pathogen is present at the spot.
- Blight (D): Pathogen is present at the infection site.
Thus, crown gall is the disease where the symptom is separated from the pathogen niche.
Step 3: Final Answer:
Thus, in crown gall, the symptom is spatially separated from the pathogen niche, which corresponds to option (A).
[0.5cm]
Was this answer helpful?
0
0
Top ICAR AIEEA Plant Sciences Questions
- Both plant and animal cells contain some small organelles called 'peroxisomes', which are dedicated to the metabolism of substances such as
- Chemicals that store energy for the majority of work within cells are called
- The longest phase during the eukaryotic cell cycle is
- The formula: [Sum of (Observed-Expected)$^2$/Expected] is also known as
- Human beings have a large-sized 'proteome'. The principal and more significant reason for this is-
View More Questions
Top ICAR AIEEA Plant Pathology Questions
- Which of the following is known to cause abnormal and unlimited proliferation of plant cells?
- Which of the following was responsible for the extinction of the Banana Variety "Gros Michel" from the market due to its high susceptibility?
- Choose the correct option about Magnaporthe
A. Magnaporthe affects only monocots
B. Magnaporthe affects only dicots
C. Magnaporthe is seed-borne
D. Magnaporthe is non motile - Match List-I with List-II
List-I (Biocompound):
(A). 2, 4-diacetyl-phloroglucinol
(B). Herbicolin
(C). Zwittermicin A
(D). Xanthobaccin A
List-II (Organism):
(I). Pseudomonas fluorescens
(II). Pantoea agglomerans
(III). Bacillus cereus
(IV). Lysobacter sp. - Match List-I with List-II
List-I (Component of microscope):
(A). Turret in a microscope
(B). Condenser in a microscope
(C). Arm of a microscope
(D). Ocular lens
List-II (Description):
(I). Lever beneath the opening in the stage consists of a shutter-like group of metal leaves which regulate the amount of light coming through the slide on the stage
(II). Revolving plate which bears the objective lens, attached at the lower end of the tube, can be turned to change the objective lens
(III). Short metal tube that contains a lens that fits into the top of the tube
(IV). Nearly C-shaped pillar arising from the base that supports the stage and ocular components
View More Questions
Top ICAR AIEEA Questions
- Which of the following statements is false?
- Which of the following is an example of an inventory?
- According to Adam Smith, productivity gains could be brought about through .
- The supply curve for an artificially scarce good is .
- Which of the following would not be considered an opportunity cost of paid employment?
View More Questions