Biotechnology has produce crops that are resistant to certain pests, crops that produce high yields, and more nitrogen-efficient crops. what is a negative impact that bioengineered plants may have on the environment?
a) beneficial insects may be adversely affected.
b) plants have an increased resistance to insect pests.
c) there is an increased need for inorganic fertilizers.
d) genetically engineered plants may have a longer shelf life.

Ans.

Biotechnology has played an important role in development of pest-resistant crops to produce high yields. Pests are various damaging agents, such as insects and rodents that adversely affect plant growth and yields. One method to control insect pest is to introduce a toxic bacterial component in the plants that kill the insects, when they feed on those plants.  

However, there are various beneficial insects also that get affected by these toxins present in plants, which shows a negative impact on the environment. Hence, the correct answer is 'option A). beneficial insects may be adversely affected.'

identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.v

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.