Given below are two statements :
Statement (I) : Phytoplasmas are wall less bacteria.
Statement (II) : Phytoplasma do possess flagella.
In light of the above statements, choose the most appropriate answer from the options given below.
Statement (I) : Phytoplasmas are wall less bacteria.
Statement (II) : Phytoplasma do possess flagella.
In light of the above statements, choose the most appropriate answer from the options given below.
Show Hint
However, they are highly sensitive to tetracyclines, which target bacterial protein synthesis on ribosomes.
- Both Statement (I) and Statement (II) are correct.
- Both Statement (I) and Statement (II) are incorrect.
- Statement (I) is correct but Statement (II) is incorrect.
- Statement (I) is incorrect but Statement (II) is correct.
The Correct Option is C
Solution and Explanation
Phytoplasmas are specialized prokaryotes that cause diseases in hundreds of plant species.
They are obligate parasites that live in the phloem of host plants and are transmitted by sap-sucking insect vectors (primarily leafhoppers).
Step 2: Detailed Explanation:
Let us analyze both statements individually:
Statement (I): "Phytoplasmas are wall less bacteria."
This statement is correct.
Phytoplasmas belong to the class Mollicutes (related to mycoplasmas).
Unlike typical bacteria, they completely lack a peptidoglycan cell wall, and their cytoplasm is enclosed only by a single trilamellar unit membrane.
Because they lack a cell wall, they are highly pleomorphic (meaning they can change shape, appearing as spherical, filamentous, or irregular bodies) to fit through the narrow sieve tube pores of the host phloem.
Statement (II): "Phytoplasma do possess flagella."
This statement is incorrect.
Phytoplasmas are completely non-motile prokaryotes.
They do not possess flagella, pili, or any other structural organs for active self-propulsion.
Instead, they are transported passively within the plant host through the flow of phloem sap, and are spread from plant to plant by the feeding activities of their insect vectors.
Step 3: Final Answer:
Statement (I) is correct, but Statement (II) is incorrect.
This corresponds to Option (C).
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-
Top ICAR AIEEA Microbiology Questions
- Choose the correct order of the following microbes based on their requirement of host - from dead to living
(A). Saprotrophs
(B). Biotrophs
(C). Hemibiotrophs
(D). Nectrotrophs - Given below are two statements, one is labelled as Assertion (A) and other labelled as Reason (R).
Assertion (A): The secondary spread of the pathogen propagules that are identical in virulence is mostly responsible for epidemics.
Reason (R): Secondary propagules are mostly asexually produced.
In light of the above statements, choose the correct answer from the options given below. Given below are two statements, one is labelled as Assertion (A) and other labelled as Reason (R).
• [Assertion (A):] Biotrophs can be easily cultured in artificial medium.
• [Reason (R):] Biotrophs lost their independent growth due to co-evolution with the host.
In light of the above statements, choose the most appropriate answer from the options given below:
Given below are two statements, one is labelled as Assertion (A) and other labelled as Reason (R).
• [Assertion (A):] Phytoplasma do not have cell wall and motility.
• [Reason (R):] Phytoplasma colonize phloem.
In light of the above statements, choose the correct answer from the options given below.
Given below are two statements:
• [Statement (I):] Bacteria need pre-existing openings or wounds on plants to initiate infection.
• [Statement (II):] Bacteria do not produce specialized infective structures.
In light of the above statements, choose the most appropriate answer from the options given below.
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?