A The plant turning its ^leaves toward the light is ^an example of a: ^A) Tropism B) Hormone ^A Most plants grow best between ^what temperatures? ^A) 10 degrees C - 38 degrees C^B) 50 degrees C - 98 degrees C^B What word describes an ^inactive plant? ^A) Growing B) Dormant ^ ^A _____ are a type of plant ^hormone which can speed up ^stem growth. ^A) Auxins B) Thyroxins ^B Thigmotropism is the ^response of a plant to: ^A) Gravity B) Contact ^ ^A Two hormones affecting ^plant growth are gibberellin ^and cytokinin. ^A) True B) False ^A One of the most widely ^used methods of propagating ^woody plants is: ^A) Grafting B) Girdling ^A All cells of a plant ^contain 2(n) number of chromo-^somes except the pollen and ^ovule. A) True B) False ^A The swollen base of the ^pistil in flowers contains ^the: ^A) Ovary B) Sperm cells ^B The transfer of pollen from an^anther to a stigma is called: ^A) Budding B) Pollination ^ ^
