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.

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 

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 

In the cloning of cattle, a fertilized egg is taken out of the mother’s womb and:   

Which one of the following is a viral disease of poultry? 
1. Pasteurellosis
2. Salmonellosis
3. Coryza
4. New castle disease 

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

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)

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 

Somaclones are obtained by  
1. Genetic engineering
2. Tissue culture
3. Plant breeding
4. Irradiation 

Breeding of crops with high levels of minerals, vitamins and proteins is called             
1. Micropropagation
2. Somatic hybridization
3. Biofortification
4. Biomagnifications