The woody parts developed by plants from ___________to___________ every year are called annual rings.
A. Spring
B. winter
C. Summer
D. Autumn
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What are the traits of vegetative organ metamorphosis of plants?
A. Morphological changes
B. Can be inherited
C. Physiological changes
D. Can not be inherited
Which season woods developed by plants collectively known as annual rings ?
A. Spring
B. winter
C. Summer
D. Autumn
_________________ discovered the artemisinin.
A. Ms Tu You-you
B. Mr Yuan Long-ping
C. Mr Mo Yan
D. Ms Wu Ming-zhu
Pollination is that _____________ are transferred on the stigmas.
A. fruits
B. flowers
C. pollens
D. seeds
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