9.3 Growth in plants

Steve Harton
Mind Map by , created over 5 years ago

DP IB Biology (09 Plant Biology) Mind Map on 9.3 Growth in plants, created by Steve Harton on 06/05/2014.

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Steve Harton
Created by Steve Harton over 5 years ago
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9.3 Growth in plants
1 NATURE OF SCIENCE
1.1 Developments in scientific research follow improvement sin analysis and deduction
1.1.1 Improvements in analytical techniques allowing the detection of trace amounts of substances has led to advances in the understanding of plant hormones and their effect on gene expression
2 MERISTEMS
2.1 Undifferentiated cells in the meristems of plants allow indeterminate growth
2.1.1 Mitosis and cell division in the shoot apex provide cells needed for extension of the stem and development of leaves
3 PLANT HORMONES
3.1 Control growth in the shoot apex
3.1.1 Plant shoots respond to the environment by tropisms
3.1.2 Micropropagation of plants using tissue from the shoot apex, nutrient agar gels and growth hormones
3.1.2.1 Use of micropropagation for rapid bulking up of new varieties
3.1.2.2 Production of virus-free strains of existing varieties
3.1.2.3 Propagation of orchids and other rare species
3.1.2.4 Used for rapid bulking up of new varieties of plant
3.2 Auxin
3.2.1 Auxin efflux pumps can st up concentration gradients of auxin in plant tissues
3.2.2 Auxin influences cell growth rates by changing the pattern of gene expression
4 TOK
4.1 Plants communicate chemically both internally and externally
4.1.1 To what extent can plants be said to have language?

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