Three crops that contribute maximum to global food grain production are                  
1. wheat , rice and maize
2. Rice, maize and sorghum
3. Wheat, maize and sorghum
4. Wheat, rice and barley 

Subtopic:  Impact: Green Revolution (OLD NCERT) |
 87%

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Why is vivipary an undesirable character for annual crop plants
1. It reduces the vigor of the plant.
2. The seeds exhibit long dormancy.
3. It adversely affects the fertility of the plant.
4. The seeds cannot be stored under normal conditions for next season.

 

Subtopic:  Plant Breeding & Its Steps (OLD NCERT) |
 57%
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Triticale, the first man-made cereal, has been obtained by crossing wheat with        
1. Rye
2. Pearl millet
3. Sugarcane
4. Barley 

Subtopic:  Plant Breeding for Quality (OLD NCERT) |
 66%

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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%
From NCERT
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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%
From NCERT

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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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