This document provides an overview of how plants respond to internal and external signals in their environment. It discusses how plants use receptors to detect stimuli like light, gravity, temperature, moisture levels and pathogens. It then describes the roles of various plant hormones like auxin, cytokinins, gibberellins, abscisic acid and ethylene in mediating responses to these stimuli, such as phototropism, drought tolerance and leaf abscission. The document also covers biological clocks, photoperiodism, and defense responses against herbivores and pathogens.
Plant respond to the environment in different ways. They also respond to environmental changes that come their way. A plant's response to light is called phototropism.
Plants also detect and respond to the daily cycle of light and darkness. For example, some plants open their leaves during the day to collect sunlight and then close their leaves at night to prevent water loss. Environmental stimuli that indicate changing seasons trigger other responses. Plants are capable of reacting to a broad range of stimuli, including chemicals, gravity, light, moisture, infections, temperature, oxygen and carbon dioxide concentrations, parasite infestation, disease, physical disruption, sound, and touch.
Plant respond to the environment in different ways. They also respond to environmental changes that come their way. A plant's response to light is called phototropism.
Plants also detect and respond to the daily cycle of light and darkness. For example, some plants open their leaves during the day to collect sunlight and then close their leaves at night to prevent water loss. Environmental stimuli that indicate changing seasons trigger other responses. Plants are capable of reacting to a broad range of stimuli, including chemicals, gravity, light, moisture, infections, temperature, oxygen and carbon dioxide concentrations, parasite infestation, disease, physical disruption, sound, and touch.
Plant hormones or Plant hormones are Auxin, Cytokinin, Gibberellic acid, Abscisic acid and Ethylene. they are also called as Phytohormones or Plant Growth Regulators which play key role in various stages of plant development such as seed germination, shoot formation, root formation, stem elongation, scenescence, abscision, fruit ripining etc.
Estas diapositivas corresponden al libro de Campbell (2010). El primer capítulo se titula Explorando la vida, tiene buenas imágenes y contenido. Las comparto con ustedes, saludos
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Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
This slide is special for master students (MIBS & MIFB) in UUM. Also useful for readers who are interested in the topic of contemporary Islamic banking.
13. Fig. 39-5b
RESULTS
Light
Tip
removed
Darwin and Darwin: phototropic response
only when tip is illuminated
Tip covered
by opaque
cap
Tip
covered
by trans-
parent
cap
Site of
curvature
covered by
opaque
shield
50. Fig. 39-28
Recruitment of
parasitoid wasps
that lay their eggs
within caterpillars
Synthesis and
release of
volatile attractants
Chemical
in saliva
Wounding
Signal transduction
pathway
1 1
2
3
4
A maize leaf “recruiting”
a parasitoid wasp as a
defensive response to
an armyworm
caterpillar, an herbivore