课程名称︰普通生物学乙上 课程性质︰必修 课程教师︰陈俊宏 开课学院：医学院 开课系所︰医学系 考试日期（年月日）︰2009／12／03 考试时限（分钟）：110min 是否需发放奖励金：是 （如未明确表示，则不予发放） I. 填充：(one points for each blank) 1. Upon double fertilization, ____________________ (part of a flower) develops into a seed, and the ____________________ develops into a fruit enclosing the seed(s) in angiosperms. 2. The following mechanisms evolved in angiosperms can reduce or even prevent self-fertilization: being dioecious species, ____________________, ____________________ and ____________________. 3. Most crop plants acquire their nitrogen from soil mainly in the form of ____________________. 10.(= = I don't know what happened here...) Nodulation occurred in legume root requires specific chemical recognition between root and rhizobium.(根瘤菌) In an effective nodule(根瘤), Leghemoglobin(豆科血红素) is formed and Rhizobium is transformed into ____________________ in where ____________________ (an enzyme) can carry out N-fixation to convert nitrogen gas into ____________________ which is incorporated into organic compounds to sustain host plants. 4. There are several substances serve as the secondary messengers in the signal transduction pathways in response to the internal or external signals: cADPR, cAMP, IP3, DAG, cGMP, ____________________ and ____________________. 5. Plant roots may absorb water from soil or lose water to soil. It means that water movement across plasma membrane is passive and the direction of movement is determined by (the driving force) ____________________. 6. Long-distance transport is from root to leaves, and the direction of phloem flow is from ____________________ to ____________________. 7. The transport protein locates on plasma membrane of companion cells or sieve tube elements and mediates the sugar loading is ____________________. 8. List the essential minerals for plant growth: C, H, O, N, K, Ca, Mg, P, __, Si, Cl, Fe, B, __, Na, __, Cu, Ni, Mo. 9. Most mineral ions present in soil are absorbed on the surface of soil particle. Plant roots are able to pump proton to soil in order to obtain mineral nutrients. The process that makes minerals available is called ____________________. 10. Among plant hormones, ____________________ is mainly synthesized in young roots' and ____________________ is mainly produced in shoot tips, and then distributed by ____________________. (the special transport process) --

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