Citrus canker is caused by
- mycoplasma
- virus
- fungus
- bacteria
The Correct Option is D
Approach Solution - 1
Approach Solution -2
Citrus canker is caused by bacteria that belong to the genus Xanthomonas. It is a plant disease and is highly contagious. The plants that are affected by these bacteria will show symptoms of lesions on their leaves, stem and the fruits. This will eventually lead to the reduction in the yield of crops. The lesions have a water soaked area surrounding them that will give a ring-like appearance.
The spread of citrus canker can be attributed to wind driven rain or splashing water that have bacterial contamination.Even the tools and other equipment can be contaminated. The contamination of bacteria should be measured and controlled so that there is no reduction in the production and cultivation of the crops.
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Top Questions on biological classification
- Study the following and pick up the correct combinations:
- TS EAMCET - 2024
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- Red Data Book describes
- WBJEE JENPAS UG - 2022
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- Match the compounds of Column I with their functions in Column II.
Column I Column II 1. Trypsin p. Fights infectious agents 2. GLUT - 4 q. Is an intercellular ground substance 3. Collagen r. Works as an enzyme 4. Antibody s. Enables glucose transport into cells - KCET - 2021
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- Which of the following statements is correct?
- NEET (UG) - 2021
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- Match the organisms in column-I with habitats in column-II Select the correct answer from the options given below :-
- NEET (UG) - 2019
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Questions Asked in AIIMS exam
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A) : 02 is liberated in the non-cyclic photophosphorylation.
Reason (R) : Liberation of oxygen is due to photolysis of water.
In the light of the above statements, choose the correct answer from the options given below
- AIIMS - 2019
- Photosynthesis in higher plants
- Which gas is present predominantly in biogas
- AIIMS - 2019
- Aerobic Respiration
- Match the following column I with column II.
- AIIMS - 2019
- cloning
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A) : The Cro-Magnon man was the direct ancestor of the living modern man.
Reason (R) : Cro-Magnon man had slightly prognathous face.
In the light of the above statements, choose the correct answer from the options given below
- AIIMS - 2019
- evolution
- Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion: Orbit of a satellite is within the gravitational field of earth whereas escaping is beyond the gravitational field of earth.
Reason: Orbital velocity of a satellite is greater than its escape velocity.
In the light of the above statements, choose the correct answer from the options given below- AIIMS - 2019
- Gravitation
Concepts Used:
Biological Classification
The process of grouping living organisms into categories is called biological classification. The most modern 5-kingdom classification was put ahead by an eminent scientist R.H.Whittaker. The five-kingdom classification is based on the criteria like cell structure, mode of nutrition, body form, and reproduction. One of the most important characteristics of this system is that it follows the evolutionary sequence of living organisms. The organisms are classified into distinct taxa or levels like Kingdom, Phylum, Division, Class, Order, Family, Genus, and Species. The 5 kingdoms are as follows:
