Which of the following is the best method to control plant diseases ?
A) Biological control
B) The selection of disease resistant varieties
C) The introduction of disease resistant varieties
D) The breeding of permanent resistant varieties
1 Answers
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Find the squares of the following number using the column method .Verify your resutl by finding th square using the usual method
Correct Answer - (a)679 (b)1089 (c )2025 (d)7056 (e )9404
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Soil that is best suited for plant growth is ………………
Correct option is B) Loamy
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The best method for extracting desirable characters in the plants
Answer is (A) i – only
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Read the following information A pea plant having two copies of the gene for tallness (TT) pollinates with a pea plant having two
Answer is (B) Only Tt
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Which part of the plant is best suited for making virus-free plants and why?
The apical and axillary meristem are the best suited parts of plant for the production of virus-free plants. These parts are generally free from virus due to the absence of vascular...
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What is the ecological principle behind the biological control method of managing with pest insects?
The ecological principle behind the biological control of pest insects is based on the ability of predator to regulate prey population in that habitat. For example Gambusia sh prey upon the...
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In advance countries like USA and UK the ………… method of measuring NI is popular. (a) Output Method / Product Method
Correct option: (2) only b
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The ability of host plant to prevent the pathogen from causing disease which is determined by genetic constitution of the host plant, is called
Correct Answer - D The ability of host plant to prevent the pathogen from causing disease which is determined by genetic constitution of the host plant, is called resistance.
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(a) Organic farmers prefer biological control of diseases and pests to the use of chemicals for the purpose justify (b) Give example of a bacterium a
Correct Answer - (a) & (b)
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How can we control spreading of diseases by mosquitoes and houseflies ?
We can control spreading of diseases by mosquitoes and houseflies by using repellants, throwing garbage in covered bins, avoiding stagnation of water and checking breeding of these insects.
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