Animal and Plant Responses Flashcards
What hormone regulates stem elongation and seed germination?
Gibberellin.
What is the function of the CNS?
It gathers information from the body and coordinates activity.
What is the role of the PNS?
To connect the CNS to the organs, limbs and skin.
What is the PNS divided into?
The somatic and autonomic systems.
What is an abiotic factor?
A non-living factor e.g. light intensity, water availability, temperature.
What is a biotic factor?
A living factor e.g. herbivores, trampling.
What is it called when the direction of plant growth is affected by light?
Phototropism.
What is it called when the direction of plant growth is affected by gravity?
Geo/Gravitropism.
Name a chemical defence plants use against herbivores.
Tannins, Alkaloids, Pheromones.
What is a nastic response?
A non-directional response to external stimuli.
What is thigmonasty?
When a sensitive plant is touched and folds its leaves.
What hormone is responsible for regulating plant growth?
Auxin/IAA (Indoleacetic acid).
Name a hormone that promotes the ripening of fruit.
Ethene.
What can the autonomic nervous system be further divided into?
Sympathetic and Parasympathetic systems.
Role of the sympathetic system.
Brings about the ‘fight or flight’ response.
