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ﺱ :ﻣﺎ ﺍﻟﻤﺠﻤﻮﻋﺔ ﺍﻟﻜﺮﻭﻣﻮﺳﻮﻣﻴﺔ ﻟﻜﻞ ﻣﻤﺎ ﻳﺄﺗﻲ :
ﺛﻨﺎﺋﻴﺔ ﺍﻟﻤﺠﻤﻮﻋﺔ ﺍﻟﻜﺮﻭﻣﻮﺳﻮﻣﻴﺔ )2ﺱ( -1ﺍﻟﻄﻮﺭ ﺍﻟﺒﻮﻏﻲ ﻟﻠﻨﺒﺎﺗﺎﺕ )2019ﺩ(2
ﺃﺣﺎﺩﻳﺔ ﺍﻟﻤﺠﻤﻮﻋﺔ ﺍﻟﻜﺮﻭﻣﻮﺳﻮﻣﻴﺔ )1ﺱ( -2ﺍﻟﺨﻠﻴﺔ ﺍﻻﻡ ﻟﻸﺑﻮﺍﻍ
-3ﺍﻟﺤﺎﻓﻈﺔ ﺍﻟﺒﻮﻏﻴﺔ
-4ﺍﻻﺑﻮﺍﻍ
ﺱ :ﻋﺮﻑ ﺍﻟﻄﻮﺭ ﺍﻟﻤﺸﻴﺠﻲ .
ﺝ :ﻭﻫﻮ ﺍﻟﻄﻮﺭ ﺍﻟﺠﻨﺴﻲ ﻭﺗﻨﺘﺞ ﻓﻴﻪ ﺍﻻﻣﺸﺎﺝ .ﻭﺑﻌﺪ ﺍﻻﺧﺼﺎﺏ ﺍﻟﺬﻱ ﻳﺘﻢ ﺑﻴﻦ ﺍﻻﻣﺸﺎﺝ ﺍﻟﺬﻛﺮﻳﺔ ﻭﺍﻻﻧﺜﻮﻳﺔ ﻳﺒﺪﺃ
ﺍﻟﻄﻮﺭ ﺍﻟﺒﻮﻏﻲ ﻭﻫﻜﺬﺍ ﺗﺘﻌﺎﻗﺐ ﺍﻻﺟﻴﺎﻝ .ﻭﻻﺑﺪ ﻣﻦ ﺍﻻﺷﺎﺭﺓ ﺍﻟﻰ ﺍﻧﻪ ﻛﻠﻤﺎ ﺗﻘﺪﻣﻨﺎ ﻓﻲ ﺳﻠﻢ ﺗﻄﻮﺭ ﺍﻟﻨﺒﺎﺕ ﻧﺠﺪ
ﺍﻥ ﺣﺠﻢ ﺍﻟﻄﻮﺭ ﺍﻟﻤﺸﻴﺠﻲ ﻳﻈﻬﺮ ﺍﺧﺘﺰﺍ ﹰﻻ ﻭﻳﺼﻞ ﻗﻤﺔ ﺍﻻﺧﺘﺰﺍﻝ ﻓﻲ ﺍﻟﻨﺒﺎﺗﺎﺕ ﺍﻟﺰﻫﺮﻳﺔ .
ﻋﻠﻞ :ﻳﻜﻮﻥ ﺍﻟﻄﻮﺭ ﺍﻟﻤﺸﻴﺠﻲ ﺃﺣﺎﺩﻱ ﺍﻟﻤﺠﻤﻮﻋﺔ ﺍﻟﻜﺮﻭﻣﻮﺳﻮﻣﻴﺔ ؟
ﺝ :ﻷﻧﻪ ﻳﻨﺸﺄ ﻣﻦ ﻧﻤﻮ ) ﺍﻻﻧﻘﺴﺎﻡ ﺍﻟﺨﻴﻄﻲ ( ﺍﻷﺑﻮﺍﻍ ﻭﺍﻟﺘﻲ ﺗﻜﻮﻥ ﺃﺣﺎﺩﻳﺔ ﺍﻟﻤﺠﻤﻮﻋﺔ ﺍﻟﻜﺮﻭﻣﻮﺳﻮﻣﻴﺔ)1ﺱ(.
ﻋﻠﻞ :ﻛﻠﻤﺎ ﺗﻘﺪﻣﻨﺎ ﻓﻲ ﺳﻠﻢ ﺗﻄﻮﺭ ﺍﻟﻨﺒﺎﺕ ﻧﺠﺪ ﺃﻥ ﺣﺠﻢ ﺍﻟﻄﻮﺭ ﺍﻟﻤﺸﻴﺠﻲ ﻳﻈﻬﺮ ﺍﺧﺘﺰﺍﻻ ﻭﻳﺼﻞ ﻗﻤﺔ ﺍﻻﺧﺘﺰﺍﻝ ﻓﻲ
ﺍﻟﻨﺒﺎﺗﺎﺕ ﺍﻟﺰﻫﺮﻳﺔ؟ ﺃﻭ
ﻋﻠﻞ :ﺇﻥ ﺣﺠﻢ ﺍﻟﻄﻮﺭ ﺍﻟﻤﺸﻴﺠﻲ ﻳﺨﺘﺰﻝ ﻭﻳﺰﺩﺍﺩ ﺣﺠﻢ ﺍﻟﻄﻮﺭ ﺍﻟﺒﻮﻏﻲ ﻓﻲ ﺍﻟﻨﺒﺎﺗﺎﺕ ﺍﻷﺭﺿﻴﺔ ﺍﻟﻤﻮﺟﻮﺩﺓ ﺣﺎﻟﻴﹰﺎ ؟
ﺝ :ﻭﺫﻟﻚ ﻷﻥ ﺍﻟﻨﺒﺎﺗﺎﺕ ﺃﺻﺒﺤﺖ ﻣﺘﻜﻴﻔﺔ ﻟﻠﺤﻴﺎﺓ ﻋﻠﻰ ﺍﻷﺭﺽ ،ﻭﻛﻠﻤﺎ ﺯﺍﺩ ﺍﻟﺘﻜﻴﻒ ﻟﻠﺤﻴﺎﺓ ﻋﻠﻰ ﺍﻷﺭﺽ ﺣﺼﻠﺖ ﺯﻳﺎﺩﺓ
ﻓﻲ ﺣﺠﻢ ﺍﻟﻄﻮﺭ ﺍﻟﺒﻮﻏﻲ ﻣﻦ ﺍﻟﻨﺒﺎﺕ ﻳﻘﺎﺑﻠﻪ ﻧﻘﺼﺎﻥ ﻓﻲ ﺣﺠﻢ ﺍﻟﻄﻮﺭ ﺍﻟﻤﺸﻴﺠﻲ ﺃﻱ ﻳﺨﺘﺰﻝ.
