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 

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.

 

Triticale, the first man-made cereal, has been obtained by crossing wheat with        
1. Rye
2. Pearl millet
3. Sugarcane
4. Barley 

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 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 

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

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 

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

A collection of plants and seeds having diverse alleles of all the genes of a crop is called           
1. Genome
2. Herbarium
3. Germplasm
4. Gene library