L2：
Lecture 2
第一题
What is the lecture mainly about?
A Reasons most leaves change colors in autumn
B The cause of green patches in some autumn leaves
C How leaf-miner larvae acquire endosymbionts
D How trees benefit by hosting leaf-miner larvae
第二题
In what way do cytokinins benefit leaf miners?
A They produce hormones that encourage reproduction.
B They protect leaf miners against bacteria.
C They help maintain leaf miners’ sources of food.
D They help leaf miners digest food.
第三题
According to the professor, what does a photosynthetically active patch on a leaf make possible?
A A greater number of new leaves in the spring
B An increase in the tree’s protection from disease
C More time for leaf-miner moths on the leaf to reproduce
D A decrease in the amount of Wolbachia bacteria in leaf-miner moths on the leaf
第四题
What is one step researchers took in investigating the relationship between Wolbachia and cytokinins?
A They injected Wolbachia into apple tree leaves.
B They removed the green islands from entire trees.
C They fed Wolbachia to leaf miners.
D They destroyed the Wolbachia in female moths.
第五题
What do the results of the experiment on leaf miners demonstrate?
Select 2 answers
A Wolbachia are part of the process in producing green islands.
B Only mature leaf miners produce cytokinins.
C Leaf miners inherit endosymbionts.
D Leaf miners can feed on both live and dead leaf tissue.
第六题
What does the professor imply about the results of the experiment?
A The results did not provide any new information about green islands.
B The results did not answer the question she feels is most important.
C The results were based on insufficient data.
D The results should be reevaluated to determine their usefulness.
