A new herbicide-tolerant crop variety has been developed. Which evaluation is MOST crucial before its commercial release, considering potential environmental impact?
Analysis of the nutritional content of the modified crop
Evaluation of the crop's yield compared to traditional varieties
Assessment of gene flow to wild relatives and the development of herbicide resistance in weeds
Study of the effects of the herbicide on non-target insects
Related Questions
What activates the protoxin of Bacillus thuringiensis into an active toxin within the gut of a bollworm?
Alkaline pH of the gut
Acidic pH of the gut
Presence of specific enzymes in the gut
Sunlight
Consider the following statements about Bt I. The bacteria Bacillus thuringiensis (Bt) are used to control butterfly catterpillers II. Fresh spores of Bt are mixed with water and sprayed on seeds such as brassicas and fruit trees III. Insect larvae, after eating these are killed by the toxin released in their gut IV. Bt toxin genes have been introduced into plants to provide resistance to pests Which of the statements given above are correct?
I and II only
II and III only
I, II and III only
I, II, III and IV
Statement I: Bt toxins are specific to certain insect groups and are encoded by the cry gene family, such as cryIAc.
Statement II: Bt toxin is initially inactive (protoxin) within Bacillus thuringiensis. Upon ingestion by an insect, the alkaline pH of the gut activates the protoxin.
Choose the correct answer:
Both Statement I and Statement II are true.
Statement I is true but Statement II is false.
Statement I is false but Statement II is true.
Both Statement I and Statement II are false.
Which of the following statements are considered as the advantages of biotechnology?
I. Creation of fermented food
II. Production of pestresistant crops
III. Plants yielding more nutritious and tastier fruits
IV. Production of new types of medicine to fight dangerous disease
Choose the correct option
Only IV
I and III
I, II and III
I, II, III and IV
Which of the following is false for Bt transgenic plant?
Bt transgenic plants are designed to be insect-resistant.
Bt transgenic plants reduce the need for chemical insecticides.
Bt transgenic plants are harmful to all insects.
Bt toxin expressed in the plant is derived from a bacterium.
Crystals of toxin produced by some bacteria do not kill the bacteria themselves because?
Bacteria are resistant to the toxin
Toxin in immature
Toxin is inactive
Bacteria enclose the toxin in special sac
Which of the following is false for Bt transgenic plant?
Disease resistance
Prepared by Bacillus thuringiensis
It is recombinant type
No such plant is known
A researcher uses Agrobacterium tumefaciens to introduce a gene into a plant cell. Which of the following is NOT a crucial step in this process?
Infection of plant cells with the engineered Agrobacterium
Insertion of the gene of interest into the Ti plasmid
Ligation of the gene into a yeast expression vector
Regeneration of the transformed plant cells
Which one of the following is correct?
Herbicides kill plant mostly by blocking PS-II (photolysis of water) and occasionally phloem transport
Insecticides kill insects mostly through impairment of nerve conduction and sometimes through respiratory arrest
Both (a) and (b)
None of the above
Disadvantages of chemical agents are
I. chemicals are toxic and harmful to human beings and animals
II. chemical pollute the environment and plants
III. weedicides used to remove weeds also pollute the soil
Choose the correct option
I, II and III
I and II
I and III
II and III
