Crop plants grown in monoculture are 

1. Low in yield.
2. Free from intraspecific competition.
3. Characterized by poor root system.
4. Highly prone to pests.

Subtopic:  Insect & Pest Resistance (OLD NCERT) |
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In order to obtain virus-free plants through tissue culture the best method is                  
1. protoplast culture
2. embryo rescue
3. anther culture
4. meristem culture 

Subtopic:  Insect & Pest Resistance (OLD NCERT) | Plant Tissue Culture |
 92%
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In maize, hybrid vigor is exploited by      
1. bombarding the protoplast with DNA
2. crossing of two inbred parental lines
3. harvesting seeds from the most productive plants
4. inducing mutations 

Subtopic:  Plant Breeding & Its Steps (OLD NCERT) |
 65%
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In the cloning of cattle, a fertilized egg is taken out of the mother’s womb and:   

1.  From this up to eight identical twins can be produced
2.  The egg is divided into four pairs of cells that are implanted into the womb of other cows.
3.  In the eight-cell stage, cells are separated and cultured until small embryos are formed which are implanted into the womb of other cows.
4.  In the eight-cell stage, the individual cells are separated under the electrical field for further development in culture media.

Subtopic:  Animal Husbandry (OLD NCERT) |
 83%
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Which one of the following is a viral disease of poultry? 
1. Pasteurellosis
2. Salmonellosis
3. Coryza
4. New castle disease 

Subtopic:  Animal Husbandry (OLD NCERT) |
 64%

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Probiotics are     
1. live microbial food supplement
2. safe antibiotics
3. cancer-inducing microbes
4. new kind of food allergens 

Subtopic:  Microbes in Household Products | Chemicals, Enzymes & Other Bioactive Molecules |
 68%
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Consider the following four measures (a-d) that could be taken to successfully grow chick-pea in an area where bacterial blight disease is common                                       

a. Spray with Bordeaux mixture
b. Control of insect vector of the disease pathogen
c. Use of only disease-free seeds
d. Use of varieties resistant to the disease

Which two of the above measures can control the disease?
1. (a) and (d)
2. (b) and (c)
3. (a) and (b)
4. (c) and (d)

Subtopic:  Insect & Pest Resistance (OLD NCERT) |
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Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide?            
1. Black rust of wheat
2. Bacterial leaf blight of rice
3. Downy mildew of grapes
4. Loose smut of wheat 

Subtopic:  Insect & Pest Resistance (OLD NCERT) |
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Somaclones are obtained by  
1. Genetic engineering
2. Tissue culture
3. Plant breeding
4. Irradiation 

Subtopic:  Plant Tissue Culture |
 86%
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Breeding of crops with high levels of minerals, vitamins and proteins is called             
1. Micropropagation
2. Somatic hybridization
3. Biofortification
4. Biomagnifications 

Subtopic:  Plant Breeding for Quality (OLD NCERT) |
 92%
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