NEW
Font size
WorksheetsSTAS PART II - 3
Total questions: 20
Worksheet time: 10mins
What is the key bacterial toxin produced by Bacillus thuringiensis (Bt)?
Alpha-toxin
Delta-toxin
Beta-toxin
Gamma-toxin
Which organism was Bacillus thuringiensis originally isolated from in Japan in 1901?
Mediterranean flour moth larvae
Dead silkworm larvae
Corn pests
Potato beetles
What German scientist named Bacillus thuringiensis after isolating it from flour moth larvae?
Shigeta Ishiwata
Ernst Berliner
Gregor Mendel
Louis Pasteur
How does Bt toxin affect susceptible insects?
Attacks the nervous system
Blocks the digestive system, starving the insect
Dehydrates the insect
Weakens the exoskeleton
Which gene in Bt produces the insecticidal protein?
Cry gene
Plasmid gene
Agrobacterium gene
Delta gene
What bacterium is used to insert the Cry gene into crop genomes?
Escherichia coli
Bacillus subtilis
Agrobacterium tumefaciens
Clostridium botulinum
What crops have been genetically modified with Bt since 1996?
Rice, wheat, soybeans, and maize
Maize, potato, cotton, and soybean
Barley, wheat, rice, and tomato
Potato, rice, barley, and wheat
Which of the following is a benefit of cultivating GM crops?
Increased herbicide usage
Decreased crop yields
Reduced use of pesticides and herbicides
Lower nutritional value
What is one major concern associated with the introduction of GMOs into the environment?
Increased biodiversity
Gene transfer to wild relatives
Reduced competition between species
Enhanced crop taste
What potential health risk is associated with GMOs?
Increased population of beneficial gut microorganisms
Alteration of the body's microorganism balance and allergenicity
Reduced production of toxins
Strengthened immune response
What is the primary purpose of ex situ conservation?
Protect species within their natural habitats
Protect species outside their natural habitats in controlled environments
Increase the population of invasive species
Eliminate predators from an ecosystem
Which of the following is an example of ex situ conservation?
National parks
Seed banks
Coral reef restoration
Wildlife corridors
What is the primary goal of in situ conservation?
To remove species from their natural habitats
To establish and manage protected areas for species preservation
To introduce invasive species into ecosystems
To prevent gene modification in organisms
Which of the following is NOT an example of ex situ conservation?
Zoological gardens
Captive breeding centers
Wildlife sanctuaries
Botanical gardens
Which is an advantage of GM crops such as golden rice?
Increased shelf life of all crops
Fortification with Vitamin A and Iron
Resistance to overwatering
Production of natural fertilizers
What is one potential environmental risk posed by GMOs?
Reduced crop yields
Emergence of secondary pests and resistant weeds
Increased biodiversity in ecosystems
Increased natural insect predators
What was the first commercially available GM food?
Bt corn
Flavr Savr tomato
Golden rice
GM cotton
Which crop is specifically genetically modified to resist pests using Bt technology?
Golden rice
Bt corn
Organic wheat
Hybrid barley
What is one limitation of GM crops?
Reduced growth and yield
Expensive and time-consuming development
Poor nutritional value
Lack of resistance to pests
How does the Cry gene in Bt crops exhibit versatility?
Through its stability across all species
Through its high degree of plasticity
By producing different types of toxins simultaneously
By targeting all pests equally
