Plant adaptations can be remarkably complex. Certain species of orchids, for instance, imitate female bees, other plants look and smell like dead animals, and still others have the appearance of stones. These strange adaptations to life represent just a few of the sophisticated means by which plants enhance their chances of survival. Mimicry in plants or animals is a three part system. There is a model: the animal, plant or substrate being initiated. There is a mimic: the organism that imitates the model. And there is a signal receiver or dupe: the animal that cannot effectively distinguish between the model and the mimic. Mimetic traits may include morphological structures, color patterns, behaviors or other attributes of the mimic that promote its resemblance to a model. That model may be either an unrelated species or an inanimate object, such as the background against which an organism spends most of its time. Mimicry is not an active strategy on the part of an individual plant; flowers do not deliberately trick or deceive animals into visiting them. Mimicry arises as the result of evolution through natural selection and the occurrence of random genetic mutations that lead over many generations to the appearance of favorable characteristics. If such traits help to camouflage a plant, for example, the plant is likely to have a survival advantage over other plants that are less well camouflaged. The plant will leave more descendants, thereby passing the advantage to the next generation. For natural selection to favor the evolution of mimicry, the mimicry must derive a reproductive advantage from modeling itself after another organism or object: its fitness, measured as the number of offspring produced that survive into the next generation, must be increased as the result of deception.
牛津七年级版初一英语上第5单元同步验收练习题(三)
牛津英语7A 语法专项练习
牛津七年级版初一英语上期中英语能力训练题(一)
人教新目标版英语七下《Unit 9 How was your weekend》word同步测试(一)
人教新目标版英语七下《Unit 12 Don’t eat in class》word同步测试(二)
人教新目标版英语七下《Unit 2 Where’s the post office》word同步测试(一)
新目标(Go for it)版初中英语七年级下册单元测试-第1次月考
人教新目标版英语七下《Unit 11 What do you think of game shows》word同步测试(二)
人教新目标版英语七下《Unit 10 Where did you go on vacation》word同步测试(二)
牛津七年级版初一英语上第3单元英语能力训练题(二)
新目标(Go for it)版初中英语七年级下册期中测试题(二)
牛津七年级版初一英语上第3单元英语能力训练题(一)
人教新目标版英语七下《Unit 11 What do you think of game shows》word同步测试
牛津英语7A Unit 2 单元试题
新目标(Go for it)版初中英语七年级下册单元测试-Unit7-Unit10
牛津英语7A 语法总结黄金强档
人教新目标版英语七下《Unit 9 How was your weekend》word同步测试(三)
牛津英语7A Unit 1 单元试题
新目标(Go for it)版初中英语七年级下册单元测试-第2次月考
新目标(Go for it)版初中英语七年级下册单元测试-第一次月考
牛津七年级预备精选题
牛津七年级版初一英语上第4单元同步验收练习题(二)
人教新目标版英语七下《Unit 10 Where did you go on vacation》练习题包(10套)
牛津英语7A Unit5 新课标同步调查测试七
人教新目标版英语七下《Unit 11 What do you think of game shows》word同步测试(一)
人教新目标版英语七下《Unit 9 How was your weekend》word同步测试(二)
人教新目标版英语七下《Unit 10 Where did you go on vacation》word同步测试(一)
人教新目标版英语七下《Unit 11 What do you think of game shows》word同步测试(三)
牛津七年级版初一英语上第5单元同步验收练习题(二)
人教新目标版英语七下《Unit 11 What do you think of game shows》word同步测试(四)
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |