External factors and Plant growth
Docsity.com
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Guidelines and tips
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Community
Ask the community
Ask the community for help and clear up your study doubts
University Rankings
Discover the best universities in your country according to Docsity users
Free resources
Our save-the-student-ebooks!
Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors
External Factors and Plant Growth - Botany - Lecture Slides, Slides of Botany and Agronomy
These are the important key points of lecture slides of Botany are:External Factors and Plant Growth, Nastic Movement, External Factors, Plant Growth, Direction of Growth, Phototropic Response, Bur Cucumber, Common Response, Diurnal Movements, Wood Sorrel
Typology: Slides
2012/2013
1 / 19
This page cannot be seen from the preview
Don't miss anything!
Related documents
Partial preview of the text
Download External Factors and Plant Growth - Botany - Lecture Slides and more Slides Botany and Agronomy in PDF only on Docsity!
External factors and Plant growth
Nastic Movement
- Nastic Movements- plants movement that occur in response to a stimulus independent of position of stimulus ( leaves light and dark cycle)
- Phototropism- response to light- caused by elongation- under the influence of Auxin
- Gravitropism- response to gravity
- Thigmotropism- response to touch
Went’s experiment- chemical produced by growing tips influences direction of growth
What role does the light play in the
phototropic response?
- Light decreases the auxin sensitivity of the cells on the lighted side
- Light destroys auxin
- Light drives auxin to the shaded side
‘Light eliminates auxin activity’
Tropism video
Auxin and root gravitropism
Gravitism video Docsity.com
Thigmotorpism- tendrils of bur cucumber, twisting Caused by different growth Rates on the inside and Outside of tendril
Phototropism
- Common response to light
Diurnal movement- biological clock is the organism
keeping itself in time with some external stimulus?
Other types of Movement
- Thigmonastic (seismonastic) Movement are results of mechanical stimulation
- Most night closure (nyctinastic movement) are results from changes in the size of perenchyma cells in the jointlike thickening (pulvinus) structure at the base of each leaf.
Mimosa pudica