40.Alfalfa is adapt to such environment conditions( A.acid soil B.waterloging C.warm and moist D.warm and dry 41.The long day plant is( A.maize B.barley C.sorghum D.soybean 42.These plants are top grass except( A.alfalfa B.white clover C.Chinese wildrye D.smooth brome grass 43.The plant that does not cause bloat is () A.alfalfa B.white clover C.red clover D.sainfoin 44.Ryegrass often can can cause A.tall fescue toxicosis B.ergot C.grass tetany D.bloat 45.Which description about ryegrass is correct? A.cold tolerance B.heat tolerance C.like fertile soil D.bad regrowth 三、简答题 1.Therefore,it is not appropriate to irrigate during seedling stage so as to promote root growth and decease rate of death. 2.Explain the importance of the soil-plant-animal biological system and its significance to human health and well-being? 3.What is the role of forage as an overall source of feed for livestock? 4.Why are forages undervalued in the overall system? 5.What region of solar spectrum is the most important for plant growth?Why? 6.How would change in latitude influnce flowering and petential seed production of a long-day grass species?Would responses be similar for a day-neutral species? 7.Why is knowing the growth stages when minimum and maximum organic reserves occur important to the management of perennial and biennial species? ce to human health and well-being? 8.What is the external condition requirements for seed germination? 9.What is a Phytomer? 10.What is tiller ?Describe the main factors that affect tillering. 11.List the main development stages of Grasses and Legumes orderly 12.List the factors that related to plant growth and development 13.What is Photoperiodism?List the three types plants and give two example plants respectively.40. Alfalfa is adapt to such environment conditions( ) A.acid soil B.waterloging  C.warm and moist D.warm and dry  41. The long day plant is ( ) A.maize B.barley C.sorghum D.soybean  42. These plants are top grass except( ) A.alfalfa  B.white clover  C.Chinese wildrye  D.smooth brome grass 43. The plant that does not cause bloat is ( ) A.alfalfa  B.white clover  C.red clover  D.sainfoin  44. Ryegrass often can can cause  ( ) A.tall fescue toxicosis B. ergot C. grass tetany D.bloat  45. Which description about ryegrass is correct?  ( ) A.cold tolerance B.heat tolerance C.like fertile soil D. bad regrowth  三、简答题 1.Therefore, it is not appropriate to irrigate during seedling stage so as to promote root  growth and decease rate of death. 2.Explain  the  importance of the  soil­plant­animal biological system and  its significance to human health and well­being?  3.What is the role of forage as an overall source of feed for livestock? 4.Why are forages undervalued in the overall system?  5.What region of solar spectrum is the most important for plant growth?Why?  6.How would change in latitude influnce flowering and petential seed production of a  long­day grass species?Would responses be similar for a day­neutral species?  7.Why is knowing the growth stages when minimum and maximum organic reserves occur important to the management of perennial and biennial species?  ce to human health and well­being?  8. What is the external condition requirements for seed germination?  9. What is a Phytomer?  10. What is tiller ?Describe the main factors that affect tillering. 11. List the main development stages of Grasses and Legumes orderly. 12. List the factors that related to plant growth and development. 13. What is Photoperiodism？List the three types plants and give two example plants respectively